Volume Nr 4

PHYSICAL CHEMISTRY

UDC 541.183:536.6

F.G.Rakhmatkarieva, G.U.Rakhmatkariev

ION-MOLECULAR COMPLEXES IN NANOSTRUCTURED ZEOLITES

 NaA AND NaA (NaBO₂)

Institute of general & inorganic chemistry of Uzbekistan Academy of sciences; 77a Mirzo Ulugbek avenue,

100170 Tashkent, UZBEKISTAN

Abstract. Background. The wide application of synthetic zeolite NaA as an effective dehydrator is explained not only by the molecular sieve action of windows entering its cavity having a diameter of 4.2 Å, but also by its high adsorption properties with respect to polar molecules of water. In the literature, there are a number of indirect and direct indications of the existence of various forms of binding of water molecules in NaA zeolite. However, there are no less convincing data of the opposite nature, indicating rather the monotony of the bonds of all molecules of "zeolite water." We have attempted to obtain more detailed information on the structure of ion-molecular complexes in the zeolite matrix and the regularities of adsorption of the polar water molecule at various stages of filling its cavities.

Purpose. To investigate the energetics, construction, and localization of extra-lattice ion-molecular clusters in nanostructured NaA and NaA (NaBO₂) zeolites.

Methodology. The method of adsorption-energy stoichiometry developed by us is based on precision adsorption-calorimetric data that makes it possible to use a completely new approach to the interpretation at the molecular level of the host-guest interaction in strategic molecular sieves.

Originality. A detailed mechanism for the formation of nanoclusters in the matrix of NaA and NaA (NaBO₂) zeolites in the entire filling region is presented for the first time.

Findings. The curves of the differential heat of water adsorption in NaA and NaA (NaBO₂) zeolites have a stepwise form, where each stage stoichiometrically reflects the formation of one- and multivariate adsorption clusters (H2O) n / Na + in a matrix of NaA and NaA (NaBO₂) zeolites. In α-cavities, (Н₂О) n / Na + clusters with Na + cations are formed in positions SIII, SII and SI. In the β-cavities of NaA four clusters with SI cations are formed. Adsorption isotherms are satisfactorily described by the trinomial equations of TOZM.

Keywords: NaA and NaA NaB (NaBO₂) zeolites, water, ion-molecular complexes, isotherm, differential heats and adsorption entropy.

Highlights: 

* Differential heats of adsorption by zeolites (H₂O) n / Na + clusters.

* The state of water in the matrix of zeolites is close to ice-like.

To cite this article: F.G.Rakhmatkarieva, G.U.Rakhmatkariev. Ion-molecular complexes in nanostructured zeolites NaA and NaA (NaBO₂) // Uzbek chemical journal.- 2016. – Nr. 4. – Pp. 3-9.

Received:  08.04.2016  Accepted: 10.06.2016 Published: 25.08.2016

References

1. Dynamical Properties of Confined Water Nanoclusters: Simulation Study of Hydrated Zeolite NaA: Structural and Vibrational Properties ACS Nano. -2008. –V.2 (8). P.1603-1614.

2. Demontis, P., Gulín-González, J., Masia, M., Suffritti, G. B. The behaviour of water confined in zeolites: molecular dynamics simulations versus experiment // Journal of Physics: Condensed Matter V. 22. N. 284106.

3. Mikuła, A.,  Król, M.,  Koleżyński, A. The influence of the long-range order on the vibrational spectra of structures based on sodalite cage // Spectrochim. Acta A Mol. Biomol. Spectrosc. 2015. V.144 P. 273-80.

 4. Sun, H.  Wu, D.  Guo, X.  Shen, B.  Navrotsky A. Energetics of sodium-calcium exchanged zeolite A. // Phys. Chem. Chem. Phys. 2015. V.17(17). P. 11198-111203.

5. Csányi, E.,  Ható, Z.,  Kristóf, Т. Molecular simulation of water removal from simple gases with zeolite NaA // Mol. Model. 2012. V. 818(6). P. 2349-56.                   

6. Breck, D.W., Eversole, W.G., Milton, R.M., Reed, T.B., Thomas // J. Amer. Chem. Soc.-1956. –V. 78. –P. 5963; Reed,T.B., Breck D.W. // ibid. -1956. -V. 78. –P. 5972.

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11. Kington, G.L., The structure and Properties of Porous Materials // Eds. D.H. Everett, F.S. Stone. Butterworths publ., London. 1958. -P. 247.

12. Avgul, N.N., Kiselev, A.V.,  Mirskii, Ya. V., Serdobov M.V. // Zh. Fiz. Khim.  -1968. -V. 42, -P. 1474.   

13. Dubinin, M.M., Isirikyan, А.А., Rakhmatkariev G.U., Serpinskii V.V. Energy of Gases and Vapors Adsorption on Microporous Adsorbents. Communication 3. Differential Heats of Water Adsorption on Crystalline Synthetic NaA Zeolite //  Izv. Acad. Nauk SSSR, Ser.Khim., -1972. -N 4. –C. 1269-1276.

14. B. F. Mentzen, Rakhmatkariev G. U. Host/Guest interactions in zeolitic nonostructured MFI type materials: Complementarity of X-ray Powder Diffraction, NMR spectroscopy, Adsorption calorimetry and Computer Simulations // Uzb. Khim. Zh. -2007.-N6. -P. 10-31.

15. Rakhmatkariev G. U. Mechanism of Adsorption of Water Vapor by Muscovite: A Model Based on Adsorption Calorimetry // Clays and Clay Minerals. -2006.-V.54. -P. 423-430.

16. Gurris, Ch., Reich, D., Buhl, J.Ch. , Hoffman, WW.: Synthesis and properties of zeolite A with salt-containing β-cages. In H.G. Karge and Weitkamp (Eds.) Stud. Surf. Sci. and Catal., -1995. -V. 98. -P.46-47.

17. Handbook of Chemistry and Physics, ed. R.C. Weast, CRC Press, Cleveland, -1975. -56^th edn.

18. Rakhmatkariev, G.U., Isirikyan A.A. A Complete description of the adsorption isotherm by the equations of the volumetric micropore occupancy  theory, Izv. An SSSR, Ser.chem. -1988. - No. 11. -P. 2644-2645.

19. Lyapin, S. B., Rakhmatkarieva, F. G., Rakhmatkariev, G. U. Atomic –Absorption determination of ion – exchange cations in zeolites // Chem. Journal. Kz. -2015, -N3. -P. 304–310.

20. Rakhmatkariev G.U., Irgashev O.K. Heats of water vapor adsorption in NaX zeolite // Uzb. Khim. Zh. -2010. -N2. -С. 12-14.

21. Boddenberg, B., Rakhmatkariev, G. U., etc. A Calorimetrical and Statistical Mechanics Study of Water Adsorption in Zeolite NaY. Physical Chemistry Chemical Physics. -2002, N 4. –P. 4171–4180.

22. Demontis, P., Gulin-Gonzalez, J., Jobic, H., Masia, M., Sale, R., Suffritti G.B. Dynamical Properties of Confined Water Nanoclusters: Simulation Study of Hydrated Zeolite NaA: Structural and Vibrational Properties ACS Nano. -2008. -V.2 (8). -P.1603-1614.

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INORGANIC CHEMISTRY

UDC 541.64.678

F.B. Eshkurbonov

STUDYING OF Complex forming PROPERTIES OF NEW MULTIFUNCTIONAL ANIONITe

SUE Tashkent research institute of chemical technology, E-mail: furqat-8484@mail.ru).

Abstract. Background. Now escalating value is purchased synthetic ion-exchange by polymers that is connected with their wide use for the problem resolution of environmental protection, complex handling of raw materials of creation of wasteless technological schemes. Therefore studying of a kompleksoobrazuyushchy capability of multifunctional ion-exchange polymers on the basis of epichlorohydrin is, in our opinion, actual.

Purpose. In article kompleksoobrazuyushchy ability to ions of copper (II) of an anionit on the basis of thiourea (T), epichlorohydrin (EHG) and a polietilenpoliamin (PEPA) is studied. Constants of stability of complexes of metals with anionity are determined by Byerrum's method.

Methodology. The structure and properties of the received mesh anionit by methods chemical, electrometric and and also IK – spectroscopy are investigated. It is found that anionita have the high exchange capacity (to 8 мг-ݬó/g) increased by chemical stability in solutions of acids and alkali and thermal firmness in water.

Originality. New multifunctional is synthesized anionit product-based interactions of thiourea (T), epichlorohydrin (EHG) and a polietilenpoliamin (PEPA) and they form complex connections with cations of some transitional metals.

Findings. It is established that increase in a phase of an anionit of amino groups in a hydrate form and reduction of concentration of solution leads to the fact that metal coordinates at most 2-3 amino groups at рН no more than 5. While at contact of copper (II) with linear PEPA there is a coordination of 4 and more amino groups of polymer. It is a consequence of the fact that coordination by metal of a large number of amino groups of gel, is interfered by three-dimensional structure of anionit.

Keywords: The complex formation, anionit, epichlorohydrin, amino groups, constants, copper ions, curves.

Highlights: 

Anionit have the high exchange capacity (to 8 mg-ek/g) increased in solutions of acids and alkali

Anionit have and thermal firmness increased in water.

To cite this article: F.B. Eshkurbonov.  Studying of complex forming properties of new multifunctional anionite // Uzbek chemical journal.- 2016. – Nr. 4. – Pp. 10-15.

Received:  08.04.2016  Accepted: 06.06.2016 Published: 25.08.2016

References

1.  Djalilov A.T., Malkanduev YU.A., Mikitaev A.K. Sintez i svoystva reaksionnoaktivnyh polimerov / GOU VPO "Ros. himiko-tehnol. un-t im. D.I. Mendeleeva". - M. : 2011. - 282 s.

2. Ergojin E.E., Tausarova B.R. i dr. Issledovanie kompleksoobrazuyushey sposobnosti ionitov s razlichnymi gruppami po otnosheniyu k ionami nekotoryx tyazhelyh i perehodnyh metallov. – Vestnik KazNU. Seriya himicheskaya. 2013. N1(69). S. 84-89.

3. Ergozhin E.E., Begenova B.E. Polielektrolitы i kompleksony // Almaty: Print-S. 2010. 164 s.

4. Ergozhin E.E., Chalov T.K., Nikitina A.I., Melnikov Ye.A. The sorption of vanadium ions by new polyfunctional anionites from ammonium metavanadate solutions // Chemical journal of  Kazakhstan. – 2014. – N 3 – R. 32 – 38.

5. Zaynitdinova B.Z., Turobzhonov S.M,, Tursunov T.T., Nazirova R.A. Mutalov SH.A. Karboksilnye kationity polikondensatsionnogo tipa. // Kompozitsionye materialy. N4. 2010. – S. 47- 49.

6. Turobzhonov S.M., Zaynitdinova B.Z., Mutalov SH.A., Tursunov T.T., Nazirova R.A. Issledovanie kinetiki reaksii polikondensatsii akrilovoy kisloty s furfurolom // J. Himiya i himicheskaya tehnologiya, N4. 2010. - S. 26-27.

7. Kattaev N.T., Babaev T.M., Mamatkulov SH.I. Izuchenie kompleksoobrazovaniya ionov medi (II) i novogo anionita// Doklan ANRUz. 2015. N6. S. 56-59.

8. Korotkova E.I., Gindullina T.M., Dubova N.M., Voronova O.A. Fiziko-himicheskie metody issledovaniya i analiza// Tomsk. Izd. Tomsk GU. 2011. 168 s.

9. Abdutalipova N.M. i dr. Sulfirovannye poliamfolity polikondensatsionnogo tipa// Himiya i himicheskaya tehnologiya. – Tashkent, 2010. N2. S. 59-61.

10. Abdutalipova N.M. i dr. Issledovanie kompleksoobrazuyushey sposobnosti ionitov polikondensatsionnogo tipa// Sovremennye problemы teoreticheskoy i eksperimentalnoy himii: VII Vseros.interak. konf., Saratov. 2010. 2010. S. 235-236.

11. Eshkurbonov F.B. Poluchenie ionitov na osnove reaksii vzaimodeystviya tiomocheviny, epihlorgidrina i razlichnyh aminov// Uzb.him.jurn. – 2013. N5. – S. 27-30.

12. Turaev H.H., Djalilov A.T., Eshkurbonov F.B., Kasimov SH.A. Sintez i svoystva ionoobmennyh smol // Uzb.him.jurn. – 2013. N1. – S. 10-13.

 

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UDC 541.127.1-126:546.262:546.98(121)

T.Kh. Rakhimov, M.G.Mukhamediev

EFFECT OF THE CARBON FIBER PRECURSORS’ STRUCTURE ON THE NANOCATALYSTS’ BOUNDARY SIZES

National University of Uzbekistan named afterv Mirzo Ulugbek, Tashkent city

Abstract. Background. Defining of distinctive boundary between the bulk and the nanocrystalline states is a major problem in the study of nanocrystals. Mathematical model named "Model of balls coloring" was proposed which has allowed to determine limits of nanoparticles dimensions in borders of which their have displayed some special properties inherited to only nanostructures. This model allows to calculate boundaries on the basis of a specially designed experiments’ series. Obviously a practical appliance of the Model to determine its viability also permit  to find out whether there is effect on the boundaries locations of bearer structure of nanocatalysts.

Purpose. To determine the effect of subtle differences in the structure of nanocatalysts’ bearers on boundary dimensions of active nanoparticles.

Methodology. Calculation of the boundaries locations of nanocrystalline states nanoparticles  boundary was performed using " Model of balls coloring"; Activity of catalysts was determined by decreasing of CO content in gas-air mixture at room conditions.

Originality. Shown that the location of the boundaries between the bulk and nanocrystalline states fundamentally depends on the structure of the nanocatalysts’ bearers

Findings. Defined the existence of the boundaries of minimal and maximal dimensions of nanoparticles beyond which “nano properties” (such as catalytic activity) disappear. Interval between minimal and maximal dimensions of boundary sizes may be either broad enough so extremely narrow; it depends on the structure of the carbon fiber and the degree of reduction treatment. In the case of using the carbon fibers obtained from the more uniform precursors above-mentioned interval was significantly narrower. Thus, it is shown that the bearer may have a decisive effect on the properties of the nanostructures.

Keywords: nanocatalysts, catalysis, oxidation, carbon monoxide, palladium, carbon fibers, boundary sizes.

Highlights:

* The influence of the bearer’s structure on the active particles dimensions revealed

* Defined the boundary dimensions of active fractions of nanoparticles

* Calculations of  boundaries performed by mathematical statistics technique

* Palladium-containing oxidation nanocatalysts used for the experiments

* The carbon fibrous materials acted as catalysts bearers

* The carbon fibrous materials obtained from different precursors

* The catalytic properties examined in carbon monoxide oxidation at 25°C

* It is shown that only a certain particles with specific diameter has activity

* The dimensions of the active fractions’ sizes are bounded from above and below

* Interval between minimal and maximal dimensions depends on the fiber structure

* Interval was narrower when the more uniform precursors used

To cite this article: T.Kh. Rakhimov, M.G.Mukhamediev. Effect of the carbon fiber precursors’ structure on the nanocatalysts’ boundary sizes // Uzbek chemical journal.- 2016. – Nr. 4. – Pp. 15-22.

Received:  18.02.2016  Accepted: 09.06.2016 Published: 25.08.2016

References

1. Braun O.M., Medvedev V.K. Uspehi fizicheskih nauk [Physics-Uspekhi], v.157, no. 4 (1989): 631-666.

2. Jonesa M. G., Blonder R., Gardner G. E., Albe V., Falvo M., Chevrier J. Nanotechnology and nanoscale science: Educational challenges.International Journal of Science Education 35, no. 9 (2013): 1490-1512.

3. Pradeep T. A textbook of nanoscience and nanotechnology. Tata McGraw-Hill Education. New Delhi, 2012. 220 p.

4. Brinkley K. W. The Synthesis of Solid Supported Palladium Nanoparticles: Effective Catalysts for Batch and Continuous Cross Coupling Reactions. Virginia Commonwealth University. Richmond, VA, 2015. 136 p.

5. Albanese A., Tang P. S., Chan W. C. W. The effect of nanoparticle size, shape, and surface chemistry on biological systems. Annual review of biomedical engineering, no. 14 (2012): 1-16.

6. Zavodinskij V. G. Komp'juternoe modelirovanie nanochastic i nanosistem [Modeling Software for nanoparticles and nanosystems]. Moscow: Fizmatlit, 2013. 244 p.

7. Valeeva A. A., Nazarova S. Z., Rempel' A. A. Fizika tverdogo tela [Physics of the Solid State], 58, no. 4 (2016): 161-168.

8. Gusev A. I., Rempel A. A. Nanocrystalline materials. Cambridge Int Science Publishing: Cambridge, 2004. P. 21-22.

9. Gusev A. I., Rempel A. A., Magerl A. J. Disorder and order in strongly nonstoichiometric compounds: transition metal carbides, nitrides and oxides.  Springer Science & Business Media. London, 2013. 608 p.

10.  Rakhimov T.Kh., Mukhamediev M.G. Modeling Of The Catalysts Behavior For Determination Of Bordering Conditions Of Special Properties Of Nanocomposites. SOJ Materials Science & Engineering, no. 2 (2015): 1-6.

11.  Wu Z.,Overbury S.H. Catalysis by Materials with Well-Defined Structures. Academic Press, Elsevier Science. London, 2015. P. 51.

12.  Briot R., Auronx A., Jones D., Primet M. Effect of particle size on the reactivity of oxygen-absorbed platinum supported on alumina. Appl. Catalysis, vol. 59 (1990): 141-152.

13.  Rakhimov T.Kh., Mukhamediev M.G. Quantitative Criteria for the Comparative Size of the Nanoparticles. J. Chem. Eng. Chem. Res 2, no. 6 (2015): 663-670.

14.  Lundwall M. J. McClure S. M., Wang X., Wang Z. J., Chen M. S. The Structure–Sensitivity of n-Heptane Dehydrocyclization on Pt/SiO₂ Model Catalysts . The Journal of Physical Chemistry C, vol. 116, no. 34 (2012): 18155-18159.

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16.  Pat. USSR no.  1524767, C01B31/18 (01.10.1990). Rahimov T.Kh., Musaev U.N., Hakimdzhanov B.Sh. Prior. no.  4664024, prior. Date 20.03.1989.

17.  Rakhimov T.Kh. Computational nanotechnology, no. 2 (2015): 6-16.      

18.  Rakhimov T.Kh., Mukhamediev M.G. Uzb. Biol. Zhurnal [Uzbekistan Journal of Biology], no.  5 (2014): 6-9.

19.  Maslennikov K.N. Himicheskie volokna [Chemical Fibers]. Moscow: Himija, 1973, P.

 

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UDC 553.611:664

D.S. Salihanova

FEATURES OF ACID ACTIVATION OF LOCAL BENTONITE CLAYS

Institute of general & inorganic chemistry of Uzbekistan Academy of sciences; 77a Mirzo Ulugbek avenue,

100170 Tashkent, UZBEKISTAN

Abstract. Background. In nature, bentonite clays have low sorption activity that requires acid treatment with regard to their mineralogical and chemical composition.

Acid activation of silicon-bearing minerals is the most common way to obtain adsorbents for bleaching (cleaning) of plant (soy, rapeseed, etc.) oils. However, the adsorbents obtained this method in the bleaching cotton phaeochrous oils containing pigments gossypol and its derivatives do not provide the color of the oil, its residual content of harmful substances, which are established standard.

Purpose. This prompted us to seek a better way of acid activation of bentonite, especially polymineral nature.

Methodology. Chromaticity of oil was determined on colorkallorimetre Lovibond, the acid number was determined by titration method. For the X-ray diffraction analysis using X-ray diffractometer Shimadzu XRD-6000  (λ = 1.5418 Å).

Originality. The carried out researches allow to establish optimal technological regimes of hydrochloric acid activation of bentonite "Jahon" Samarkand region, taking into account the peculiarities of its mineralogical and chemical compositions.

Findings. It is established that at 4 hour treatment with 10% hydrochloric acid lead to a decrease of calcium and sodium cations, and Ca / Na ratio is stably maintained as 2:1. Lowering the concentration of sodium and calcium ions occurs at 83.3% and 95% respectively. At the same time by 57% decreased the amount of magnesium ions, indicating that perhaps the beginning of washing structural cations. Amount of potassium cations remains unchanged and can suppose that the cation is a member of the feldspar steady against influence to acids. After treatment, 10-th hydrochloric acid content of calcium ions approaching the minimum level.

Keywords: montmorillonit, bentonite, acid activation, modification, bleaching, color of the oil, acid number

Highlights:

* Studied the effect of enrichment on the chemical composition of bentonite.

* Bentonitic clay "Jahon" Samarkand region. refers to Ca - type.

* Acid activation spends enough during 4 hours with 10% hydrochloric acid.

To cite this article: D.S. Salihanova. Features of acid activation of local bentonite clays. // Uzbek chemical journal.- 2016. – Nr. 4. – Pp. 22-28.

Received:  18.08.2016  Accepted: 20.08.2016 Published: 25.08.2016

References

1.RST Uz 816:2015  «Maslo hlopkovoe  rafinirovannoe».

2.Salihanova D.S., Agzamhodjaev А.А. Kislotnaya aktivatsiya glinistih adsorbentov s ispolzovaniem mikrovolnovogo izlucheniya // Uzbekskiy himicheskiy jurnal. -Таshkent. -2009.  -N1. -S.30-40.

3. R. Naseem. Removal of Pb (II) from  aqueous/acidic solutions by using bentonite as adsorbent / Wat. Res. – 2001. – Vol.35, N16. P. 3982-3986.

4. E. Eren. Revoval of basic dyes using raw and acid – activated bentonite samples/  J. of Hazard. Mat. -2009. – Vol.166, N 2. –P.830-835

5. Lapteva U.S., Yusupov Т.S., Berger А.S. Fiziko-himicheskie izmeneniya sloistih  silikatov v protsesse mehanicheskoy aktivatsii. Novosibirsk: Nauka, 1981, S.87

6. Dudkin B.N., Louxina I.V., Avakumov Е.G., Himiya v interesah ustoychivogo razvitiya, 2004, Т.12, S.327-330.

7. Neaman A., Pelletier M., Villiers F. Appl. Clay Sci., 2003, v.22,p.153-168.

8. Drozdov V.А., Doronin V.P., Kinetika i kataliz, 2001,t.42,N1,S.129-138

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10. V.P. Finevich, N.А. Allert., Т.R. Karpova. Kompozitsionnie nanomateriali na osnove kislotno-aktivirovannih  montmorillonitov// Ros.him.jurnal., 2007,m.LI,  N4, -S.69-74

11. Mostaligina L.V., Chernova Е.А., Buhtoyarov О.I., Kislotnaya aktivatsiya bentonitovoy glini // Vestnik  YuUrGU, N24, 2012, -S.57-61.

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13. RST Uz 624-94. Maslo hlopkovoe. Metod izmereniya tsvetnosti. Tashkent: Gosstandat. 1994. – s.7.

14. GOST-05-446 Metod opredeleniya kislotnogo chisla. Тashkent. 2013.-3 s.

15. Kovba L.M., Тrunov V.К. Rentgenofazoviy analiz. - М.: МGU, 1969. –160 s.

 

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UDC 666.762.3

S.S.Tairov, Al.A.Eminov, H.L.Usmanov, A.A.Eminov

INFLUENCE OF THE TYPE BURNABLE ADDITIVES ON DENSITY OF THE LIGHTWEIGHT REFRACTORY CERAMIC MATERIAL

Institute of general & inorganic chemistry of Uzbekistan Academy of sciences; 77a Mirzo Ulugbek avenue,

100170 Tashkent, UZBEKISTAN; E-mail: xlusmanov@rambler.ru

Abstract. Background. At present in Republic heat insulation lightweight refractory and tight fusible ceramic material are not produced and are completely imported from foreign state, countries A.I.S.. However, the real premiseses exist in republic on provision production lightweight refractory heat insulation material local raw materials component this of refractory clays, kaolins, inexpensive fuel secondary facility, including waste different production, in particular burnable additives. Use departure as burnable additives is, actual with economy and ecological standpoint.

Purpose. Is a development import substituting composition magnesium lightweight refractory material on the base serpentinite cheese, with use burnable additives.

Methodology. Experimental work are executed with using the modern methods physical-chemical analysis such as roentgen phase, crystal optic, spectral, analytical, as well as traditional methods of the studies ceramic and refractory technology.

Originality. The Installed processes of the times formation in structure lightweight refractory, as a result high temperature burning compositions on the base of serpentinite and burnable additives.

Findings. The optimum of the compositions magnesium of the lightweight refractory masses will Selected on the base serpentinite cheese with different burnable  additive. It Is Installed that pilot models, got with use the method burnable additives, burnt in interval of the temperature 1000-1350^оS were got defect less, in particular without deforming, rifts and punching and on factor by density answer the normative requirements a GOST 5040-96.

Keywords: lightweight refractory, serpentinite, burnt, times formation, burnable additive, waste of coal, sapstok.

Highlights:

* Is Designed import substituting compositions the magnesium of the lightweight refractory.

* As times formation is used waste different production.

* Is Received lightweight refractory material with three-dimensional weight below 1,4 g/sm³.

To cite this article: S.S.Tairov, Al.A.Eminov, H.L.Usmanov, A.A.Eminov. Influence of the type burnable additives on density of the lightweight refractory ceramic material // Uzbek chemical journal.- 2016. – Nr. 4. – Pp. 28-34.

Received:  16.08.2016 Accepted: 21.08.2016 Published: 25.08.2016

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5. -sirevaya baza stroitelnih materialov UzSSR. Spr. Fan.: 1967.-600s.
6. Bаrkоvskаya Е.I., Kоrsаkоv V.S. О gеоlоgо-sеmоchnih rаbоt mаsshtаbа 1:25000, prоvеdеnnih nа vоstоchnоm оkоnchаnii Zirаbulаkskih gоr v 1965-1966 gg. Оtchеt Zаrаfshаnski GRЭ, Sаmаrkаnd, T.: GGF.-1967.- 465 s.
7. Hаmidоv R.А., Virоvец V.V., Shеvchеnkо V.N. Оprеdеlеniе nаprаvlеniy gеоlоgо-rаzvеdоchnih i nаuchnо-isslеdоvаtеlskih rаbоt nа аlyumоsilikаtnое, krеmnеzеmistое i uglеrоdistiе оgnеupоrnое sirе s uchеtоm pоtrеbnоsti prоmishlеnnоsti i imеyushihsya gеоlоgichеskih prеdpоsilоk., T.: Fоndi IMR.-2002.-650 s.
8. Hаmidоv R.А., Pаnchеnkоvа L.А. Rеsursi mаgnеziаlnоgо оgnеupоrnоgо sirya Uzbеkistаnа //Geologiya va mineral resurslar. -2000.- N3.- S.25-27.
9. Kаdirоvа Z.R., Pirmаtоv R.H., Eminоv А.А., Bugаеnkо V.А., Usmаnоv H.L.Vliyaniе tеmpеrаturi оbjigа nа fizikо-himichеskiе i tеrmоmеhаnichеskiе svоystvа оgnеupоrnih mаtеriаlоv //Оgnеupоri i tеhnichеskаya kеrаmikа.- Rоssiya.-2014.-N 4-5.-S.79-81.
10. Kadyrova Z.R.., Eminov A.A.,  Usmanov H.L., Pirmatov R.X., Bugayenko V..A. Prospective resources for the production of Uzbekistan refractory materials. // Material of International to  the  scientific  conference «Second International Conference of Industrial Technologies and Engineering». -Shymkent, Kazakhstan.-2015.-R.101-106.
11. аdirоvа Z.R., Usmаnоv H.L., Эminоv А.А., Bugаеnkо V.А., Pirmаtоv R.H. Rеntgеnоgrаfichеskiе isslеdоvаniya sirеvih kоmpоnеntоv dlya оgnеupоrnih mаss// Оgnеupоri i tеhnichеskаya kеrаmikа.-Rоssiya.- 2012.-N6.- S.33-38.
12.   imichеskаya tеhnоlоgiya kеrаmiki i оgnеupоrоv. Pоd.rеd.I.Yа.Guzmаnа, M, ООО RIF, «Strоymаtеriаli», 2005, 336 s.
13. ОST 8691-73 Izdеliya оgnеupоrniе оbshеgо nаznаchеniya.
14. ОST 5040-96 Izdеliya оgnеupоrniе i visоkооgnеupоrniе lеgkоvеsniy tеplоizоlyatsiоnniе. Tеhnichеskiе uslоviya.

 

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UDC 631.85:661

B.E. Sultonov, Sh.S. Namazov, B.S. Zakirov, A.M. Reymov, O.I. Popova

STUDY OF RHEOLOGICAL PROPERTIES OF HYDROCHLORIC ACID SOLUTIONS AND PRECIPITATING PULPS

Institute of general & inorganic chemistry of Uzbekistan Academy of sciences; 77a Mirzo Ulugbek avenue,

100170 Tashkent, UZBEKISTAN

Abstract. Background.  Phosphorites of Central Kyzylkum (CK) are the raw materials for phosphorus containing fertilizers production in Uzbekistanm but they are imperfect in content of basic component (Р₂О₅). Direct obtaining of concentrated phosphorus containing fertilizers from these phosphorites seems to be un-economical and inexpedient. The data on obtaining of feed and fertilizer precipitates based on hydrochloric acid’s processing of CK phosphorites reveal few drawbacks: involvement  of most concentrated part of phosphorites and complexity of technological scheme. Besides, the rheological properties of hydrochloric-phosphoric acidic solutions and precipitating pulps.

Purpose. study of rheological properties of hydrochloric-phosphoric acidic solutions and precipitating pulps obtained on a basis of processing of phosphorite flour from phosphorites CK by hydrochloric acid without and with separation of insoluble residues.

Methodology. Density was measured by bottle method and viscosity - by glass capillary viscosimeter VPL-2 with 1,31 mm diameter in the range of temperatures 30-60ºС.

Originality. The rheological properties of hydrochloric-phosphoric acidic solutions and precipitating pulps depending on acid’s concentration and temperature were studied. The optimum conditions of obtaining fluid hydrochloric-phosphoric acidic solutions and precipitating pulps were found out.

Findings. There were found out optimum conditions of obtaining fluid hydrochloric-phosphoric acidic solutions and precipitating pulps: temperature 30-50^оС and concentration of hydrochloric acid 10-16 % in cases of separating or non-separating of insoluble residues. The optimum parameters of the process in case of separation insoluble residue are the following: temperature 30-50^оС and concentration of hydrochloric acid 16-32 %.

Keywords: phosphorite flour, hydrochloric acid, hydrochloric-phosphoric acidic solution, precipitating pulps. neutralizing reagents.

Highlights:

 * Hydrochloric-phosphoric acidic solution and precipitating pulps are obtained.

* Rheological properties of technological solutions and precipitate pipes are studied.

To cite this article: B.E. Sultonov, Sh.S. Namazov, B.S. Zakirov, A.M. Reymov, O.I. Popova. Study of rheological properties of hydrochloric acid solutions and precipitating pulps // Uzbek chemical journal.- 2016. – Nr. 4. – Pp. 34-41.

Received:  04.08.2016 Accepted: 10.08.2016 Published: 25.08.2016

References

1. M.A., Davronbekov U.Yu., Daniyarov N.A., Nurkulova Е.A. Оbogashenie slojnih fosforitovih rud mestorojdeniya Дjeroy-Sardara i perspektiva ih intensifikatsii // Gorniy vestnik Uzbekistana, 2001.-N1.-P.77–79.
2. Askarov M.A., Daniyarov N.A., Nurkulova Е.A. Flotatsiya fosforitnih rud // Gorniy vestnik Uzbekistana, 2005. -N3. -P.87–89.
3. Ismagilov M.M. Kizilkuskiy fosforitoviy kompleks Navoiyskogo gorno-metallurgicheskogo kombinata 2006. -P.19–22.
4. Sezar Norbert V. Promishlennoye udaleniye hloridov iz fosfatnoy rudi pri mokrom obogashenii v ekstremalnih usloviyah pustini Kizilkum // Gorniy vestnik Uzbekistana. -2008. -N4. -P.54–58.
5. Mamadjanov S.M., Amirova A.M., Adilova M.R., Abdurahmanova D.R. Pretsipitirovaniye solyanokislotnoy vityajki fosfatov v zavisimosti ot tehnologicheskih parametrov // Uzbekskiy himicheskiy jurnal, Ташкент. -1986. -N3. -P.57-59.
6. Mamadjanov S.M., Amirova A.M., Adilova M.R., Abdurahmanova D.R. Vliyaniye tehnologicheskih parametrov na pretsipitirovaniyasolyanokislotnoy vityajki fosfatov // Uzb. him. jurn. 1987. -N3. -P.47-49.
7. Mamadjanov S.B. Razrabotka tehnologii pretsipitata solyanokislotnoy fosforitov Karatau i : Автореф. дис.... канд. техн. наук - Ташкент. 1988. – 24 p.
8. Sultonov B.E., Namazov Sh.S., Popova O.I. Solyanokislotnaya pererabotka nekonditsionnogo fosfatnogo sirya na pretsipitat // VII Mejdynarodnaya nauchno-prakticheskaya konferentsiya «Aktualniye problemi Sovremennoy nauki v 21 veke». Sbornik materialov Mejdunarodnoy nauchno-prakticheskoy konferensii  g. Mahachkala, 2015. -P.49-51.
9. Sultonov B.E., Seytnazarov A.R., Namazov Sh.S., Reymov A.M. Solyanokislotnaya pererabotka visokokarbonatnoy fosforitovoy muki Sentralnih Kizilkumov na udobritelniy pretsipitat // Himicheskaya promishlennost, Sankt-Peterburg, 2015. -N4. -P.163-168.
10. Sultonov B.E., Namazov Sh.S., Zakirov B.S. Solyanokislotnoe polucheniye pretsipitata na osnove mineralizovannoy massi iz fosforitov Sentralnih Kizilkumov // Gorniy vestnik Uzbekistana, Nauchno-tehnicheskiy I proizvodstvenniy jurnal, 2015. -N1. -P.99-101.
11. Sultonov B.E., Namazov Sh.S., Popova O.I., Reymov A.M. Izucheniye protsessa polucheniya pretsipitata iz fosforitov Sentralnih Kizilkumov // Х-Mejdunarodnaya nauchno-prakticheskaya konferensiya «Noviy poisk v sovremennom mire» Sbornik materialov, Mahachkala, 2015. -P.23-26.
12. Sultonov B.E., Namazov Sh.S., Popova O.I. O vozmojnosti polucheniya pretsipitata iz himicheski obogashennogo fosforitovogo kontsentrata // Х- Mejdunarodnaya nauchno-prakticheskaya konferensiya «Perspektivi razvitiya nauchnih issledovaniy v 21 veke», Sbornik materialov, g.Mahachkala, 2016. -P.27-28.

 

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ORGANIC CHEMISTRY

UDC 1.138.2:546.185.4:661.635.68

Kh.S. Beknazarov

STUDYING OF THE MECHANISM OF INHIBITION OF THE DEVELOPED OLIGOMER INHIBITORS OF CORROSION

Tashkent chemical technological institute, e-mail: hasan74@mail.ru

Abstract. Background. Inhibition of corrosion of metals by water-soluble oligomer and polymers attracts because of their low toxicity, availability and possibility of their multifunctional application.

Purpose. For the solution of this issue there was a need of development and production of inhibitors based on local raw material resources or wastes in the synthesis of oligomeric inhibitors possessing set of valuable properties.

Methodology. Reaction of interaction of a molecule of inhibitor of corrosion with iron (II) ions was studied by an IR-spectroscopy method. The interaction of a oligomeric inhibitors of corrosion IK-8 and IK-9 with steel surface covered by  iron (II) ions was fulfilled by IR-spectroscopy.

Originality. Properies of synthesized oligomer inhibitors of steel corrosion on the basis of a polyethylenepolyamine (PEPA) with dimethyl terephthalate (IK-8) and destructive products of polyethyleneterephthalate (PETP) with trietanolamine and adduct of urea (IK-9) were investigated.

Findings. It is established that at interaction of a molecule of oligomer inhibitor of corrosion IK-8 with an iron (II) ion, a strip at 1370, 1458, 1557 cm^-1 belonging to C-N, NH bonds practically disappears because of a de- protonating of imine group, at the same time the new strip in the range of 1110 cm^-1 of the relating ionic interaction of Fe²⁺ appears. The amino group interacts practically without de-protonating, that means  the shift of a strip of valent fluctuations of N-N of group on 30 cm^-1 and reveals the fact of its coordination by iron (II) ion. It is established that coordination of iron (II) with oligomer inhibitor of corrosion IK-9 leads to essential changes in comparison with initial in the field of valent and deformation fluctuations. Emergence of a strip of merger of the ionized group at 523-619 cm^-1 testifies to a complex formation of iron (II) ions with them. And molecules of oligomer IK-9 inhibitor are coordinated to Fe²⁺ ion as well through oxy group - OH since intensity of valent fluctuations of this strip (2851-2918 cm^-1) significantly decreases.

Keywords: corrosion inhibitor, IR-spectroscopy, oligomer, polyethyleneterephthalate, polyethylenepolyamine, dimethyl terephthalate, triethanolamine

Highlights:

* The propensity of molecules of oligomeric corrosion inhibitors to complex formation has been studied.
* It is established that the formed monolayer protects it from external influence.

To cite this article:  Kh.S. Beknazarov. Studying of the mechanism of inhibition of the developed oligomer inhibitors of corrosion // Uzbek chemical journal.- 2016. – Nr. 4. – Pp. 42-46.

Received:  06.04.2016 Accepted: 10.05.2016 Published: 25.08.2016

References

1. M.S. Al-Otaibi, A.M. Al-Mayouf, M. Khan, A.A. Mousa, S.A. Al-Mazroae H.Z. Alkhathlan, “Corrosion inhibitory action of some plant extracts on the corrosion of mild steel in acidic media,” Arabian Journal of Chemistry, pp. 1-7, 2012.

2. A. El Bribri, M. Tabyaoui, B. Tabyaoui, H. El Attari, F. Bentiss,“The use of Euphorbia falcata extract as eco-friendly corrosion inhibitor of carbon steel in hydrochloric acid solution,” Materials Chemistry and Physics, vol. 141, issue 1, pp. 240-247, 2013.

3. M. Znini, L. Majidi, A. Bouyanzer, J. Paolini,. J. -M. Desjobert, J. Costa e B. Hammouti, “Essential oil of salvia aucheri mesatlantica as a green inhibitor for the corrosion of steel in 0.5M H₂SO₄,” Arabian Journal of Chemistry, vol. 5, n. 4, pp. 467-474, 2012.

4. Negm, Nabel A.; Kandile, Nadia G.; Badr, Emad A.; Mohammed, Mohammed A. Gravimetric and electrochemical evaluation of environmentally friendly nonionic Corrosion Inhibitors – Principles, Mechanisms and Applications http://dx.doi.org/10.5772/57255 375 corrosion inhibitors for carbon steel in 1 M HCl. Corrosion Science, vol. 65, pp. 94-103, 2012.

5. A. Lecante, F. Robert, P.A. Blandinières, C. Roos. “Anti-corrosive properties of S. tinctoria and G. ouregou alkaloid extracts on low carbon steel,” Current Applied Physics, vol. 11, Issue 3, pp. 714-724, 2011.

6. Chirkunov A.A. Zashita mеtallov ot atmosfеrnoy korrozii tonkimi plеnkami ingibitorov // IV Mеjdunarodnaya nauchno-praktichеskaya konfеrеntsiya s elеmеntami nauchnoy shkoli dlya molodеji «Ekologichеskiе problеmi nеftеdobichi-2014». Ufa. 2014. -S. 256-257.

7. Eshmamatova N.B. Sintеz i fiziko-himichеskoе isslеdovaniе oligomеrnih ingibitorov korrozii // Privoljskiy nauchniy vеstnik. Nr. 8 (24), tom 1 – 2013. –S. 8-12.

8. Eshmamatova N.B., Akbarov X.I. Isslеdovaniе effеktivnosti razrabotannih oligomеrnih ingibitorov v proizvodstvеnnih usloviyah elеktrohimichеskimi mеtodami // Privoljskiy nauchniy vеstnik. – Izhеvsk, 2012. – Nr. 12. –S. 4–12.

9. Eshmamatova N.B. Ingibirovaniе korroziyi mеtallov na osnovе novyh fosfororganichеskih ingibitorov // «Zеlyonaya himiya» v intеrеsah ustoychivogo razvitiya: matеriali I Rеspub. nauch.-prakt. konf. – Samarkand, 2012. – S. 198–200.

10. Bеknazarov X.S., Djalilov A.T. Izuchеniе antikorrozionnih svoystv novih oligomеrnih ingibitorov korrozii // Kompozitsionniе matеriali. 2014. –Nr 3. –S. 20-24.

11. Bеknazarov X.S., Djalilov A.T. Zashita stali ot korrozii oligomеrnimi ingibitorami i ih kompozitsiyami // Himiya i himichеskaya tеhnologiya.-2015. –Nr 1. –S. 50-52.

12. Bеknazarov X.S., Djalilov A.T. Sintеz i isslеdovaniе oligomеrnogo ingibitora korrozii IKS-AEXG-1 // Sbornik tеzisov dokladov V mеjdunarodnoy konfеrеntsii shkoli po himiyi i fizikohimiyi oligomеrov. Volgograd. 2015. –S. 35.

 

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УДК 661.717.3

A.T. Djalilov, *B.B. Eshmuratov, M.U. Karimov

SYNTHESIS OF ETHANOLAMINES FROM ETHYLENE CHLOROHYDRIN  STUDY

S.U.E. Tashkent Scientific - Research Institute of Chemical Technology

*JSC "Uztransgaz"

Abstract. Background. One of the most pressing issues of our republic is the implementation of the production of ethanolamines based on local raw materials. The raw material base of ethanolamines are chloroethanol, ethylene oxide and ammonia, which are derived from ethylene present in sufficient quantities in our country.

Purpose. Improving the efficiency synthesis step of production of ethanolamines, providing the maximum yield ethanolamines (DEA) in the reaction mixture.

Methodology. IR spectra were obtained on samples of ethanolamines infrared Fourier spectrometer Spectrum BX II (firm «Perkin Elmer») by partial internal reflection method using as internal standard KBr. The spectrograms of ethanolamines samples were taken to determine the characteristics of the absorption lines in the spectrum of formulations.

Originality. The scientific novelty of this work is as follows: 1. Determination of the optimal conditions for ethanolamines, based on ethylene chlorohydrin; 2. The study of the physicochemical properties of ethanolamines, based on ethylene chlorohydrin.

Findings. absorption bands in the region 1640-1560 cm^-1 and 900-650 cm^-1 are characteristic of the chemical bond - NH₂. The intensity of the absorption bands in the 1640-1560 cm^-1 appears strongly and widely. The absorption bands in the regions 1050, 1250, 3640, 3350-3310 and 3500 cm^-1 characterized for functional groups - CH₂ - OH as part of ethanolamines. The absorption bands in the regions 1250, 1500-1300 cm^-1 wide and shifted to high frequencies with increasing hydrogen bond between the - CH₂ - OH. The yield of monoethanolamine highest in the ratio ethylene chlorohydrin and ammonia 1:10.

Keywords: ethanolamines, chloroethanol, ammonia, IR spectroscopy, ethylene.

Highlights:

* Determination of the optimal conditions for ethanolamines.

* Study of the physicochemical properties of obtained ethanolamines.

To cite this article: A.T. Djalilov, *B.B. Eshmuratov, M.U. Karimov. Synthesis of ethanolamines from ethylene chlorohydrin  study // Uzbek chemical journal.- 2016. – Nr. 4. – Pp. 46-51.

Received:  02.02.2016 Accepted: 24.06.2016 Published: 25.08.2016

References

1. Ethanolamines: Technical Bulletin/«Oxiteno». Brazil, 2002. - 4 р.

2. Chemical Profile etanolamines// Chemical Market Reporter. - 2004, July.

3. Ethanolamine. Monoethanolamine, diethanolamine,triethanolamine: Technical bulletin/ "Dow Chemical Company". Midland, USA, 2003. - 20 p.

4. Sarkisov P.D. Problemy energo- i resursosberezheniya v himicheskoy tehnologii, neftehimii i biotehnologii // Himicheskaya promyshlennost, 2000.-N1. -S.19-25.

5. V.P.Gruzinov Ekonomika predpriyatiya. — M.: Finansy i statistika, 2000. -326 s.

6. Patent N2162461 RF, MKI С07С213/04 Sposob polucheniya etanolaminov/ Ryleev G.I., Mihaylova T.A., Nikushenko N.T., Lugovskoy S.A.(RF) -N2000112562/04, zayavl.22.05.2000, Opubl. 27.01.2001, Byul.№3

7. Patent N2167147 RF, MKI С07С215/08 Sposob polucheniya etanolaminov / Ryleev G.I., Mihaylova T.A., Nikushenko N.T., Lugovskoy S.A.(RF) -№2000119218/04, zayavl.20.07.2000, Opubl.20.05.2001 Byul.№14.

8. Patent N2225388 RF, MKI С07С 213/04. Sposob polucheniya etanolaminov / Mihaylova T.A., Lugovskoy S.A. Nikushenko N.T., Nagrodskiy M.I., Lavrentev I.A. (RF). N2003105171/04; zayavl. 21.02.2003, Opubl. 10.03.2004, Byul.№ 7.

1. Dzhalilov A.T., Hamidov A.A., Eshmuratov B.B., Karimov M.U. Issledovanie poluchenie okisi etilena iz etilena VIII Mezhdunarodnaya nauchno-tehnicheskaya konferentsiya «Gorno-metallurgicheskiy kompleks: dostizheniya, problemy i sovremennye tendentsii razvitiya», Navoiyskiy gosudarstvennyy gornyy institut, g. Navaiy, 19-21 noyabr 2015g.

10. Chemical Profile ethanolamines - brief article//Chemical Market Reporter.2001. June 11.

11. Dzhalilov A.T., Hamidov A.A., Eshmuratov B.B., Karimov M.U. Izucheniye sinteza etanolaminov iz etilenhlorgidrina // VIII Mezhdunarodnaya nauchno-tehnicheskaya konferentsiya «Gorno-metallurgicheskiy kompleks: dostizheniya, problemy i sovremennye tendentsii razvitiya»,  Navoiyskiy gosudarstvennyy gornyy institut, g. Navaiy, 19-21 noyabr 2015g.

1. Dzhalilov A.T., Hamidov A.A., Eshmuratov B.B., Karimov M.U. Issledovanie sinteza etanolaminov // Respublikanskaya nauchno-tehnicheskaya konferentsiya «Aktualnye problemy innovatsionnyh tehnologiy himicheskoy, nefte-gazovoy I pishevoy promyshlennosti» Tashkent-2015., 18-20 noyabr.

 

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UDC 614.841.1

F.N.Nurkulov., A. T. Djalilov

RESEARCH SYNTHESIZED PHOSPHORUS - BORON-CONTAINING OLIGOMERNOGO OF FIRE-RETARDING AGENTS

Tashkent chemical technological institute, e-mail: nfayzulla@mail.ru

Abstract. Background. Wood and polymeric composite materials, thanks to organic binding, are combustible. At the same time toughening of safety requirements dictates need of use of nonflammable materials.

Purpose. Develop phosphorus and boron-containing oligomeric flame retardant using local raw materials that have a set of useful features.

Methodology. The structure and composition of the synthesized oligomer flame retardant investigated IR spectral method. The destruction of the synthesized phosphorus and boron-containing oligomeric flame retardant was studied by differential thermogravimetric analysis. Fire tests veneer samples was carried out in the installation "flame tube" according to GOST 17088-71.

Originality. Synthesized new multifunctional oligomeric phosphorus flame retardant based on reaction products of boron-containing compounds, and the first time studied the properties of flame retardant grade ADj-3 (Author prof .: Djalilov A.T and Nurkulov F.N)

Findings. It is found that boron-containing molecules and oligomeric phosphorus flame retardant, absorption bands in the regions of the absorption bands containing phosphorus P=O and P-O-C intense. In addition, there are low-intensity narrow band at 1000 - 1250sm^-1. IR spectrum of the compound containing boron connection has absorption in areas 600-800sm and 1460sm^-1-one. In effect, there are six endothermic curve DTA derivatograms sample ADj-3 at a temperature of 118 - 238 °C, and five exothermic effect at 350 - 740 °C. From the data obtained it can be concluded that the resulted exothermic and endothermic options retardants determine their use in certain temperature intervals. Results of the study formulations ADj-3 showed that the average loss of weight of the sample was 7.5%, that is flame retardant provides a group I of fire-proof efficiency.

Keywords: IR spectroscopy, oxidation, degradation, wood, flammability, oligomeric flame retardant, flame retardant.

Highlights.

* Destruction ADj-3 at 877⁰S - 55%.

* Weight loss in the test - 7.5%, which provides group I of fire-proof efficiency.

To cite this article: F.N.Nurkulov., A. T. Djalilov. Research synthesized phosphorus - boron-containing oligomernogo of fire-retarding agents // Uzbek chemical journal.- 2016. – Nr. 4. – Pp. 52-57.

Received:  28.04.2016 Accepted: 24.05.2016 Published: 25.08.2016

References

1. Camino G., Lomakin S. in Fire Retardant Materials, Eds., A.R. Horrocks and D. Price, CRC Press, Boca Raton, FL, 2001, USA.
2. Kajiwara N., Desborough J., Harrad S., Takigami H. Photolysis of brominated flame retardants in textiles exposed to natural sunlight, Environ. Sci. Process. Impacts 15 (2013) 653-660.
3. Joseph, P.; Mcnally, S.T. Reactive modifications of some chain- and step-growth polymers with phosphorus containing compounds: Effects on flame retardance: A review. Polym. Adv. Technol. 2011, 22, 395–406.
4. Law RJ, Allchin CR, de Boer J, Covaci A, Herzke D, Lepom P, et al. Levels and trends of brominated flame retardants in the European environment. Chemosphere 2006; 64:187-208.
5. Shen, Y.M., Kuan, F.C. Preparation , characterization , thermal, and flame retardant properties of green silicon containing epoxy functionalized grapheme nanosheets composites. J. Nanomat. 2013, 1–10. DOI: 10.1155/2013/747963.
6. Gonoshilov D.G., Kablov V.F., Kеybal N.A. Noviе propitochniе ognеzahitniе sostavi na osnovе fosforborsodеrjahеgo oligomеra i poliakrilamida // Fundamеntalniе isslеdovaniya – 2011.- 8. –S.627-630.
7. еva R.R. Fotostabilizatsiya PBT smеsyami jеlеza. Izvеstiya Kabardino-Balkarskogo gosudarstvеnnogo univеrsitеta / 2014, T. 4, № 6.
8. еnt RF №2418898 Sostav dlya ognеzahitnoy obrabotki sintеtichеskih volokon // Kеybal N.A., Kablov V.F., Bondarеnko S.N. 20.05.2011
9. еvich B.N. IK-spеktri osnovnih klassov organichеskih soеdinеniy. Spravochniе matеriali. – M.: MGU im. M.V. Lomonosova, 2012. – 54 s.
10. Nurkulov.F.N., Djalilov A.T. Fosfor-borsodеrjashiе oligomеrnie antipirеni dlya drеvеsini i drеvеsnih kompozitsionnih matеrialov. V Mеjdunarodnaya konfеrеntsiya-shkola po himii i fizikohimii oligomеrov Volgograd, 1-6 iyunya 2015.
11. Nurkulov.F.N., Djalilov A.T. Isslеdovaniе svoystva ognеzahitnih matеrialov na osnovе oligomеrnogo antipirеna. Rеspublikanskiy mеjvuzovskiy sbornik CHAST-1. TKTI. Tashkеnt 2015g.
12. Nurkulov.F.N., Samigov N.A., Djalilov A.T.Ognеzahita stroitеlnih matеrialov s primеnеniеm oligomеrnogo antipirеna. Matеrialo` rеspublikanskoy nauchno-tеhnichеskoy konfеrеntsii “O’zbеkistonda qurilish tеxnologiyalari va ularni rivojlantirish masalalari”. 20-21 noyabr 2015g. “TASI” Tashkеnt.

 

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UDC 541.64:678.745.547.235

M.M. Karimov, M.K. Rustamov, M.B. Qayumov, N.R. Muhamedov

HYDROPHILIZATION  POLYVINILCHLRIDE  AS  CHEMISTRI MODIFYING

National University of Uzbekistan, Tashkent, kmm221416@mail.ru

Abstract. Background. The use of polyvinylchloride in practice is associated with many difficulties due to the hydrophobic nature of the polymer surface. This can lead to large adverse effects in long-term contact, in particular when it is based on the materials used in biological systems. Due to the high hydrophobicity and low surface free energy, polyvinylchloride has a low biocompatibility, undesirable protein adsorption and bacterial adhesion. For improvement data of shortages applicable various methods: treatment surface of ready items through several physical methods (vacuum treatment, thermal treatment, covering, influence of rays with various energy) and chemical methods (adding plasticizers, obtaining composition materials, chemical modification surfaces of items with various regents). Also may be used polymer analogical reactions due to atoms of chlorine of polyvinylchloride with various hydrophilic substances.

Purpose. The goal was to increase the hydrophilic surface modification of polyvinylchloride by its glycine, aminocaproic, ortho, meta, para-amino benzoic acid.

Methodology. The reaction is studied by gravimetry, potentiometric titration and IR spectroscopy. Scientific novelty of the work is the use of a variety of amino acids as polyvinylchloride modifying agents.

Originality. It has been shown to influence the process of modifying the nature of the modifying reagent, their concentrations, solvent, temperature, and bath unit.

Findings. The optimal conditions for polyvinylchloride hydrophilization process has been established: time of modification – 7 hours, concentration of modification reagent 15 %, temperature of reaction 160 ⁰С. On the base of obtained results calculated energies of activation of studied reactions. Showed influence of nature of solvent to the modification reaction process.

Key words: polyvinylchloride, modification, aminoacetic, aminocaproic, ortho-, meta-, para- aminobenzoic acid, static exchange capacity.

Highlights:

* Optimal conditions of hydrophilizing reaction were: 7 hours, the concentration of 15%, temperature 160°C.

* The activation energies from 5.9 to 7.7 kJ/mol in the range of temperatures 100-180^ºC were established.

* The influence of the nature of the modifying agent with the reaction was shown.

To cite this article: M.M. Karimov, M.K. Rustamov, M.B. Qayumov, N.R. Muhamedov. Hydrophilization  polyvinilchlride  as  chemistri modifying // Uzbek chemical journal.- 2016. – Nr. 4. – Pp. 57-65.

Received:  29.02.2016 Accepted: 03.06.2016 Published: 25.08.2016

References

1.Wilkes C., Summers J., Daniels C. PVC Handbook; Hanser: Munich, Germany, 2005.

2.Murphy J. Additives for Plastics Handbook; Elsevier: Oxford, UK, 2001.

3.Wypych G. Handbook of Plasticizers; William Andrew Publishing: New York, NY, USA, 2004.

4. Asadinezhad  A., Lehocký M., Sáha Р., Mozetič M. Recent Progress in Surface Modification of Polyvinyl Chloride. Materials 2012.N5. Р. 2937-2959;

 5.Sowe M., Polaskova M., Kuritka I., Sedlacek T., Merchan M. Analysis of antibacterial action of polyvinyl chloride surface modified with gentian violet. Int. J. Polym. Anal. Charact. 2009. N14. Р.678–685.

6.Stamm M. Polymer Surfaces and Interfaces; Springer: Berlin, Germany, 2008.

7.Kucherenko O.B., Kohlert C., Sosnov E.A., Malygin A.A. Influence of the physicochemical treatment procedure on the morphology and properties of the polyvinyl chloride film surface. Russ. J. Appl. Chem. 2006, 79, 1857-1861.

 8.Asadinezhad A., Novak  I., Lehocky  M., Sedlarik  V., Vesel  A., Junkar I., Saha  P., Chodak  I. An in vitro bacterial adhesion assessment of surface-modified medical-grade PVC. Colloid Surf. B 2010, 77, Р.246-256                             

9.Goddard, J.M., Hotchkiss, J.H. Polymer surface modification for the attachment of bioactive compounds. Prog. Polym. Sci. 2007, 32,Р. 698-725.

10.Wen  X.Q., Liu  X.H., Liu G.S. Prevention of plasticizer leaching from the inner surface of narrow polyvinyl chloride tube by DC glow discharge plasma. IEEE. Trans. Plasma Sci. 2010, 38,Р.3152-3155.

11.Karimov M.M., Timerbaeva E.R., Rustamav M.K., Mukhamediev. M.G. Synthesis and physic-chemical properties of carboxylic ionits. Under the sponsorship of IUPAC. 8th International Symposium «Molecular order and mobility in polimer system». St. Petersburg, 2014. P.116.

12.Mironov V.A, Jankowski S.A. Spectroscopy in Organic Chemistry. M.: Chemistry, 1985. Р.42-48.

13.Semchikov Y.D. "High-molecular compounds", Moscow - Nizhny Novgorod Publishing Center "Academy", 2003.

 

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UDC 678.6.541.6:536.495

A.B.Juraev, M.G.Alimukhamedov, F.A.Magrupov, R.I.Adilov

RESEARCH OF THE INFLUENCE OF THE STRUCTURE OF ALCOHOLYSIS PRODUCTS OF SECONDARY POLYETHYLENE TEREPHTHALATE ON THE PROPERTIES OF UNSATURATED POLYETHERS ON THEIR BASIS

Tashkent chemical-technological institute, e-mail: asror_tcti@ mail.ru

Abstract. Background. Alongside increase of the manufacture of such products, as artificial: marble, stone, granite, pipes, fibreglasses and other composite materials in the Republic of Uzbekistan, requirement for unsaturated polyesters (USPEP) increases. Requirement for USPEP in the Republic is satisfied at the expense of import of these resins.

One of chemical processing ways of secondary polyethylene terephthalate (SPET) is their chemical decomposition of multinuclear alcohols, hence to obtain hydroxylcontaining polyesterpolyols (HCP) which can be used as spirit component of USPEP. Properties of UPEP in many respects depend on molecular weight of HCP used  for its synthesis.

Рurpose. Studying the influence of alcoholysis products structure of SPET with diethyleneglycol (DEG) on solidification process and physical-mechanical properties of USPEP on their basis.

Methodology. In the research following methods of research were used. Number-average molecular weight has been defined on the Cryoscopy method in the mixture with camphor. The maintenance of double bonds in unsaturated polyesters has been defined on the Bromide-bromate method.

Gelatinization time has been defined according to SS (State Standard) 22181-91, the static curve has been defined according to SS 4648-71, and impact elasticity - on 14235-69.

Originality. It has been defined that changing structure of HCP depending on molar ratio SPET:DEG and on the  alcoholysis time, it is possible to change hardening rate and physical and chemical properties of USPEP on their basis in large bound.

Findings. It has been determined that the increase of alcoholysis time to certain duration leads to the decrease of number-average molecular weight of  (М_n) HCP, viscosity of USPEP on its basis and to the acceleration of USPEP gelatinization process.

By research of physical-mechanical properties of hardened USPEP, it is revealed that shock durability of developed USPEP are at level of industrial samples, and  on curve strength and heat stability of developed USPEP surpass industrial samples a little.

 Keywords:  alcoholysis product of secondary polyethylene terephthalate, maleic anhydride, unsaturated polyester, structure.

Highlights:

* Structure of alcoholysis products of SPE  with  DEG was influenced on the properties of unsaturated polyesters. 

* With  variation of  alcoholysis duration of SPET may regulate the structure of USPEP. 

To cite this article: A.B.Juraev, M.G.Alimukhamedov, F.A.Magrupov, R.I.Adilov. Research of the influence of the structure of alcoholysis products of secondary polyethylene terephthalate on the properties of unsaturated polyethers on their basis // Uzbek chemical journal.- 2016. – Nr. 4. – Pp. 65-70.

Received:  23.03.2016 Accepted: 20.05.2016 Published: 25.08.2016

References

1. Sedov L.N. Mihaylova Z.V. Nenasyshennye poliefiry. – М.: Khimiya. 1977. – S. 47,48,58.
2. Reyblan A.I. Zashitnye lakokrasochniye pokrytiya. –М.: Khimiya. 1982. -520 s.
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6. Sunain K. Kinetics study of Unsaturated Polyester synthesized from waste PET // Asian Journal of advanced basis sciences. 2013. – Nr 1.– Р. 87-92.
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10.  A.B. Juraev, R.I. Adilov, T.A. Nizamov, M.G. Alimukhamedov, F.A. Magrupov, I.T. Usmonov. Synthesis and Research of unsaturated  Polyethers on the Basis of Secondary Polyethylene Terephtalate // J. Kautschuk Gummi Kunststoffe, 2014, Nr 3. –Р. 41-45.

1. A.M. Torepseva, K.V. Belogorodskaya, B.M. Bondarenko. Laboratorniy praktikum po himiyi i tehnologiyi vysokomolekularnyh soyedineniy. –L.: Himiya , 1972, – 416 s.

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UDC 661.547.458

S.B. Khaytmetova, A.S. Turaev

HYDROLYTIC SPLITTING OF CELLULOSE DERIVATIVES WITH ADJUSTABLE MOLECULAR PARAMETRES

Institute of Bioorganic Chemistry of Uzbekistan Academy of Sciences,xsb75@mail.ru

Abstract. Background. Carboxymethylcellulose (CMC) is widely used in pharmaceuticalbranchesdue to its biocompatibility, biodegradability, absence of acute and chronic toxicity and allergic responses and availability.Currently,there aregood experiences and scientific materialsto use cellulose derivatives for the medical and biological purposes. However, preparation process of Nа-CMC with fixed molecular parameters have been poorly studied.

Purpose. To study particularaspectsof the hydrolytic splitting process of the industrial Nа-CMC with DP of 530 and DS of 85 to obtain hydrolytic degradedCMCwith targeted properties, with degree of substitution (DS) of 0,65±5 and degree of polymerizations (DP) of 42; 54; 75; 90; 120; 150; 216; 290.

Methodology. Industrial Nа-CMC having DP 530 and DS 85 was used as research object. Hydrolyticsplitting of the Na-CMC carried out heterogeneously in the three-neck flask with reflux condenser and a mechanical stirrer, in ethanolic medium at 78-80оС. Precalculated amount of the concentrated hydrochloric acidwas then added with constant stirring.The reaction was carried out at various ratios of reagents, duration of reaction and temperatures. The reaction product was separated from the reaction mixture, decantedand washed out up to the neutral medium.

IR- spectra were recorded in KBr pellets, with FTIR spectrophotometer at 500-4000 cm-1.

Originality.  For the first time preparation of CMC with fixed properties through hydrolytic splitting has been investigated.

Temperature, concentration of reagents and duration of the reactionwere found as determining parameters for process of heterogeneous hydrolytic splitting of Nа-CMC.

Findings. For the first time a preparation method of modified CMC with fixed molecular and structural parameters was developed.

Keywords: hydrolytic splitting, heterogeneous, carboxymethylcellulose, Nа-CMC.

Highlights:

* The reaction rate considerably enhances in increase of concentration.

* СMCwith various molecular characteristicscan be obtainedwith change of hydrolysis time.

* With increasing temperature increases the relative catalytic activity of the acids.

To cite this article: S.B. Khaytmetova, A.S. Turaev. Hydrolytic splitting of cellulose derivatives with adjustable molecular parameters // Uzbek chemical journal.- 2016. – Nr. 4. – Pp. 70-75.

Received:  09.06.2016 Accepted: 17.06.2016 Published: 25.08.2016

References

1. Alyushin M.T., Artemov A.I., TrakmanYu.G. “Polimeri v farmatsii” pod redaksiey chl.-korr. AMN SSSR prof. A.I. Tensovoyi prof. M.T. Alyushina. –M: “Meditsina” 1985. –S.22.

2. KunalPaletal.Development of carboxymethyl cellulose acrylate for various biomedical applications // Biomed. Mater.2006. -N1 -Р.85-91.

3. Filatova A.V. Strukturirovanie Nа-karboksimetilsellyulozi v rastvore i poluchenie gelevih kompozitsiy na ee osnove: Avtoref. Dis…. kand. him. nauk.- Tashkent: UzR FA, 2001.

4. Joon-Ho Lee, Young-Chang Nho, Youn-Mook Lim, Tae-Il Son Prevention of surgical adhesions with barriers of carboxymethylcellulose and poly(ethylene glycol) hydrogels synthesized by irradiation // Wiley Periodicals, Inc. J ApplPolym. 2005. -V. 96, Issue 4 , -P. 1138 – 1145.

5. Plisko E.A., Nud’ga L.A., Petropavlovskiy G.A. Sintezvodorastvorimihkrotolatov I metakrilatov KMS // JPH. 1982. - N9. (55). -S. 2133-2136.

6. Chiumiento A., Lamponi S., Barbucci R., Dominguez A., Perez Y., Villalonga R. Immobilizing Cu, Zn-superoxide dismutase in hydrogels of carboxymethylcellulose improves its stability and wound healing. // Biochemistry. -Moscow, 2006. -V. 71, -N12.

7. Lipatov V.A. K voprosuprofilaktikiposleoperatsionnogospaechnogoprotsessabryushnoypolosti/ MaterialiTret’eymejd. Nauchno-prakticheskoykonf. “Zdorov’eiobrazovanie v XXI veke", 29-31 marta 2002. -Моskva, 2002. -S. 256-257.

8. Jbankov R.G. Infrakrasniespektrisellulozi I eyoproizvodnih. Minsk: Izd. Naukaitehnika, 1964. -340s.

9. Turaev A.S. Polimerniekarbokisloti: sintez, prevrashenie, svoystva, medico-biologicheskiepolimerinaihosnove: Dis….dokt. him.nauk. -Tashkent: UzR FA, 1993.

10.ShomurotovSh.A.Sinteziizuchenieprotivotuberkuleznoyaktivnostiproizvodnihkarboksimetilsellyuloziipoligalakturonovoykisloti s gidrozidomizonikotinovoykislotiietanbutolom: Dis…. kand. him. nauk.- Tashkent: UzR FA, 2009.

11. Hasanova S.B., Gulyamov T., Yunusova H.M., Turaev A.S., Murodov E.A., Atajanov A.Yu., Djalilov H.K. Razrihlitel dlya tabletirovaniya na osnove karboksimetilsellyulozi.// Kimyo va farmatsiya. – Tashkent, 2000. -N3-4, -S.84-87.

12. Patent UZ № IAP 03207. Sostav dlya tabletirovaniya / Gulyamov T., Turaev A.S., Atajanov A.Yu., Yunusova H.M., Djalilov H.K.Hasanova S.B. // Rasmiy ahborotnoma. - 2006. -N6.

 

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UDC 547.945

Sh. N. Zhurakulov, V. I. Vinogradova, M. G. Levkovich

REACTIONS OF 4-(FORMYL)-2,3,4,10-TETRAHYDRO-1H-PYRIDO[2,1-b] QUINAZOLIN-10-ON WITH SODIUM BOROHYDRIDE AND SECONDARY AMINES

Institute of Chemistry of Plant Substances, Academy of Sciences of the Republic of Uzbekistan, Tashkent city 100170, Uzbekistan. e-mail: j.sherzod.78@mail.ru

Abstract. Background. Biologically active  compounds as  medicines (deoxypeganine and others) were found among quinazoline alkaloids. They attract an increased attention of researchers to develop new methods for producing the quinazoline derivative in order to obtain biologically active substances.

Purpose. To study the reaction of 4-formylmakinazolinon with sodium borohydride and secondary amines.

Methodology.  Reaction Vilsmeier - Haack  adaptation, by NaBH₄. Synthesized substances were characterized by IR, ¹H NMR and mass-spectral methods.

Originality. It was shown that the reduction of 4-formylmakinazolinon by  NaBH₄ formed unusual product - 4-(methyl)-2,3,4,10-tetrahydro-1H-pyrido[2,1-b]quinazolin-10-on. All obtained substances were characterized chemically including spectral methods (IR, 1H NMR, and mass spectroscopy).

Findings. The reactions of 4-formylmakinazolinon with secondary amines and sodium borohydride were investigated. Differences in behavior of 3-hydroxymethylidene-1,2,3,9-tetrahydropyrrolo[2,1-b]-quinazolin-9-on and 4-(formyl)-2,3,4,10-tetrahydro-1H-pyrido[2,1-b]quinazolin-10-on in  the reaction with  secondary amines were  found. 4- Formylmakinazolinon does not interact with pseudoephedrine and 1-(phenyl)-6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline in a solvents: acetonitrile, chloroform, ethanol, trifluoroacetic acid, benzene, and dioxane. It was found that the reduction of 4-formilmakinazolinon by NaBH₄ excess formed thermodynamically unstable 4-(hydroxymethyl)-1,2,3,4,4a,5-hexhydro-1H-pyrido[2,1-b]quinazolin-10-on, partially oxidizing to 4-(hydroxymethyl)-2,3,4,10-tetrahydro-1H-pyrido[2,1-b]quinazolin-10-on, and easily transforming to a relatively more stable 4-(methyl)-2,3,4,10-tetrahydro-1H-pyrido[2,1-b]quinazolin-10-on. Compound  4-(methyl)-2,3,4,10-tetrahydro-1H-pyrido[2,1-b]quinazolin-10-on a new previously not described derivative.

Keywords: makinazolinon, 4-(formyl)-2,3,4,10-tetrahydro-1H-pyrido[2,1-b] quinazolin-10-one, reduction.

Highlights:

* Quantum-chemical calculations of the 4-formylmakinazolinon four tautomers developed.

* The influence of quinazolinone structure on the reaction with the secondary amines investigated.

* Recovery of 4-formylmakinazolinon by NaBH₄ leads to an unusual new product.

To cite this article: Sh. N. Zhurakulov, V. I. Vinogradova, M. G. Levkovich. Reactions of 4-(formyl)-2,3,4,10-tetrahydro-1h-pyrido[2,1-b] quinazolin-10-on with sodium borohydride and secondary amines // Uzbek chemical journal.- 2016. – Nr. 4. – Pp. 75-81.

Received:  05.04.2016 Accepted: 10.06.2016 Published: 25.08.2016

References

1. Fitzgerald J. S., Johns S. R., Lamberton J. A., Redcliffe A.H. 6,7,8,9-Tetrahydropyridoquinazolines, a new class of alkaloids from Mackinlaya species (Araliaceae) // Austral J. Chem. -1966. -19. -р. 151.
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3. Oripov E., Shakhidoyatov K. M., Kadyrov C. S., Abdullayev N. D. Qinazolines.  13. Some reactions of 2,3-polymethylene-3,4-dihydroquinazolin-4-ones with electrophylic reagents // Chem. Heterocycl Comp. -1979. -N5. -рр. 684-691.
4. Zhurakulov Sh. N., Elmuradov B. Zh and Vinogradova V. I. Synthesis of novel methylidene bridged quinazoline-isoquinoline Alkaloids // Am. Chem. Sci. J. -2015. -V. 9 (2). -р. 1-7.
5. Z,  Shakhidoyatov  K. M. Interaction  of  α-hydroxymethylidene-2,3-trimethylene-3,4-dihydroquinazolin-4-one with amines. // Khim Khim Tekhnol. -2008. -3. -с. 27-31.
6. Jurakulov Sh. N., Vinogradova V.I. Reaksiya 3-gidroksimetiliden-1,2,3,9-tetragidropirrolo[2,1-b]-hinazolin-9-ona i 4-(formil)-1,2,3,4,10-pentagidropirido[2,1-b]-hinazolin-10-ona s benzilaminom i psevdoefedrinom // Uzbek. him. jurnal. Tashkent, -2015. -№ 5.  -s. 25-29.
7. Nasrullaev A. O., Turdibayev Z. E., Elmuradov B. Z.,Abulimiti Yili, Haji Akber Aisa, Shakhidoyatov K. M. Chemicaltransformationsofmackinazolinoneanditsderivatives // Chem. Nat. Compd. -2012. -V. 48. -pp. 638-642.
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10. Turdibayev Z. E, Elmuradov B. Z, Khakimov М. М, Shakhidoyatov  Kh. M.  Formylation  of deoxyvasicinone  by  alkylformates: synthesis  and  reaction  of  α-hydroxymethylidenedeoxyvasicinone  with isomeric aminophenols and aminobenzoic acids // Chem.  Nat.  Compd. -2011. –V. 47(4). -p. 600-603.
11.  Shakhidoyatov K. M. Himicheskie prevrasheniya trisiklicheskih hinazolinovih alkaloidov // v kn. Azotistye geterosikly i alkaloidy.pod. red. Karsev V. G., Tolstikova G. A. // Izd. «Iridium-press»  -2001. Tom 1. -s.186-196.
12. Khachatryan D. S., Matevosyan K. R. Sintezy i svoystva 1,2-digidro-4-hinazolinonov // v kn. Azotistye geterosikly i alkaloidy.pod. red. Karsev V. G., Tolstikova G. A. // Izd. «Iridium-press»-2001. Tom 1. –s. 558-562.
13.  Turdibayev Z. E, Elmuradov B. Z., Shakhidoyatov K. M. O napravleniyah vosstanovleniya α-gidroksimetilidendezoksivazisinona i α-formilmakinazolinona // Materaly konferensii molodyh uchenyh. “Aktualnye problemy himii prirodnyh soedineniy”. Tashkent. -2010. -s. 202.

 

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UDC 547.944/945

I.I. Okhunov, U.T Karimov, V.U. Khujaev, S.F. Aripova

COMPONENTS OF THE FLOWERS OF PLANT CRAMBE ORIENTALIS

The Institute of the Chemistry of Plant Substances Academy of Sciences, 100170, Tashkent, Republic of Uzbekistan. Fax (99871) 120 64, e-mail: salima_aripova@mail.ru

Abstract. Background. Chemical investigation of the plants as potential sources of new effective drugs for medicine is actual in modern bioorganic chemistry. Alkaloids, as one of the classes of natural compounds widely used in medicine as therapeutic agents to a milder and aimed effect than their synthetic analogues.

Рurpose. The aim of this study is to investigate the chemical composition (alkaloids and other secondary metabolites) of flowers of the plant Crambe orientalis, collected Bostanlik district of Tashkent region (12.06.2015 y) in the flowering stage and a comparative analysis of the results on the aerial parts and roots of plants.

Methodology.  In the process of the present study we used a chromatography-mass spectrometry method for the identification of low molecular weight metabolites study object.

GC-MS analysis of C. orientalis flowers components was performed on a gas chromatograph Agilent 7890A GC with a quadrupole mass spectrometer Agilent 5975C. Identification of substances based on comparison of retention times and mass spectra characteristics with W8N05ST.L library.

Originality. For the first time by chromatography-mass spectrometry technique investigated the components of flowers C. orientalis grown in Uzbekistan.

Findings.  According to GC-MS analysis in Crambe orientalis flowers detected 10 components, among which there are pyrrolidine, piperidine derivatives, sulfur-containing compound with 1,3- dimethylltrisulfid groups, alkaloids goitrin and nicotine. Is noted that the flowers as aerial part and the roots contain as a major component goitrin and dimethyl ether of 1,3-oxazolidine-2,4-dicarboxylic acid. It has been established that the dimethyl ether of 1,3-oxazolidine-2,4-dicarboxylic acid is present only in flowers and first observed in the natural object.

Keywords: Crambe orientalis, flowers, goitrine, 1,3-oxazolidin-2,4-dicarboxylic acid dimethyl ether, chromatography-mass spectrometry

Highlights:

* According to GC-MS analysis in Crambe orientalis flowers detected 10 components

* Dimethyl ether of 1,3-oxazolidine-2,4-dicarboxylic acid is present only in Crambe orientalis flowers

To cite this article: I.I. Okhunov, U.T Karimov, V.U. Khujaev, S.F. Aripova. Components of the flowers of plant crambe orientalis // Uzbek chemical journal.- 2016. – Nr. 4. – Pp. 81-85.

Received:  28.03.2016 Accepted: 24.06.2016 Published: 25.08.2016

References

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2. Rod Crambe L.- Каtran.//Flora Uzbtristana. Izd-vo АN Uzbecskoy SSR.- Tаshkent.-1955.-Т.-3.-С. 184-186.

3. Оhunov I.I., Levcovich М.G., Аbdullaev N.J., Khujaev V.U., Аripova S.F. АLkaloidi Crambe kotschyana flori Uzbekistana. // Khimiya prirod. soedin. - 2011.- N 3.- С. 431-433.

4. Nabiev А.N., Оhunov I.I., Аripova S.F. Оtdelnie farmacologicheskie svoistva ekstracta rasteniya Каtran //Теz. dоkl. коnf. «Integratsiya оbrazovaniya, nauki i proizvodstva v farmatsii». Таshkent, - 2010. - С. 336-337.

5. Islamova J.I., Оhunov I.I., Khushbactova Z.А., Sirov V.N., Аripova S.F. Аntitireoidnaya аctivnost summi аlkaloidov rasteniy roda Crambe. //Dokladi АN Ruz, N 4, С. 43-45 (2015).

 6. Mario R. Altamura, Louis Long Jr., and Torsten Hasselstrom. Goitrin from Fresh Cabbage. //J. Biolog. Chem. - 1959.- V.- 234.- N 7.- Р. 1847-1850.

7. Ohunov I.I., Aripova S.F., Bobakulov Kh. M., Abdullaev N.D., Khuzhaev V.U. Alkaloids and Other Low-Molecular-Weigth Metabolites from Crambe kotschуana // Chem. Nat. Comp.- 2011.- N 4.- Vol. 47.- P. 671-673.

8. Аripovaва S.F., Оhunov I.I., Sagdullaev B.Т., Sagdullaev Sh.Sh., Аbdullaev N.D., Sirov V.N., Khushbactova Z.А., Islamova J.I., Nigmatullaev А.М. //Sredstvo, proyavlyayushee antitireoidniye svoistva. Patent R Uz № IAP 04966, 03.10.2014 d. Rasmiy ahborotnoma, N 11, 44 B.(2014 y.). 

9. Оhunov I.I., Таshkhodjaev B., Levcovich М.G., Аshurov J., Аripova S.F., Аbdullaev N.J. N-(Benzimidazolyl-2)-О-etylcarbomat iz Crambe kotschyana //uzbekskiy khimicheskiy jurnal.- 2011.- N.3.- С. 20-22.

10. Ohunov I.I., Tаshkhodjaev B., Levkovich M.G., Khujaev V.U., Aripova S.F., Abdullaev N.D. N-(Benzimidazolyl-2)-О-ethylcarbomat from Crambe kotschyana // Abstracts of «Proceedings of 2^st International Symposium on Edible Plant Resources and the Bioactive Ingredients». - Urumchi (China). - 2010. -Р. - 91.

11. Okhunov I.I., Levkovich M.G., Aripova S.F. Krambain – a New Alkaloid from  Plants  of  the Genus Crambe. //Chem. Nat. Comp.- 2013.- N 2. - Vol. 49.- P. 317.

12. Оhunov I.I., Levcovich М.G., Тurgunov К.К., Аripovа S.F. 5-Gidroksi-4,5-digidrooksazol-2-tiol I tsiklicheskaya sera iz Crambe кotschyana // Khimiya prirod. soedin.- 2016.- N 1.- С. 159-160.

 

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UDC 665.5

Makhmudov M.J., Narmetova G.R.

INVESTIGATION OF MOTOR GASOLINE AI-80 FOCUSED UPON ITS PROPERTIES IMPROVEMENT

Institute of general & inorganic chemistry of Uzbekistan Academy of sciences; 77a Mirzo Ulugbek avenue,

100170 Tashkent, UZBEKISTAN

Abstract. Background. In recent years, the ecological properties of motor gasoline began to face very strict requirements. Using of ecologically clean   modified gasoline in cars, along with improvement of engine`s construction and the in working process, has lead to the minimum amount of toxic substances in exhaust gases.

Рurpose. – research of motor gasoline AI-80 to improve its ecological properties and compliance with the requirements of modern European specifications.

Methodology.   The research has based on a set of classic and modern methods, allowing to determine the physical and chemical characteristics, functional composition, to study processes occurring in the initial motor gasoline and gasoline subjected to various processes of gentrification, in particular, dearomatization, as well as to establish the chemical compositions, structure, chemical nature and their stability. It should be noted, that the gasoline AI-80 does not meet the requirements of European standard quality, yet.

Originality. For the first time low-octane gasoline with identifying ways to improve its properties was investigated.

Findings. Complete physical and chemical analyses of gasoline AI-80 has shown a pale yellow color, its transparent view, and octane number equal to – 80, or 76 by motor method, a density – 0.770 g/cm³ and a refractive index 1.4632, water and contaminants are not present, according to a copper plate test. The fractional composition – 50% distilled at 104°C, 90% distilled at 150°C and an end of boiling point is 180°C.

Key words: gasoline, acidity, density, refraction, molecular mass, mechanical admixture, sulphur, benzene, ecological standard

Highlights:

* To reach Euro-5 requirements 6.2% (weight) of benzene should be removed.

* The amount of zeolite for the process of dearomatization of gasoline was calculated.

To cite this article: Makhmudov M.J., Narmetova G.R. Investigation of motor gasoline ai-80 focused upon its properties improvement // Uzbek chemical journal.- 2016. – Nr. 4. – Pp. 85-90.

Received:  28.04.2016 Accepted: 12.05.2016 Published: 25.08.2016

References

1. Tehnicheskiy reglament Tamojennogo soyuza TR TS 013/2011 «O trebovaniyah k avtomobilnomu i aviatsionnomu benzinu, dizelnomu i sudovomu toplivu, toplivu dlya reaktivnix dvigateley i mazutu», (utverjden: Komissiya Tamojennogo soyuza, reshenie, no. 826 ot 18.10.2011).

2. Kartoshkin, A.P. Toplivo dlya avtotraktornoy tehniki: spravochnik: ucheb. posobiye / A.P. Kartoshkin – M.: Akademiya, 2012. – 192 s.

3. Haziev A.A. Sovremenniye trebovaniya k kachestvu avtomobilnih benzinov / A.A. Haziev // Sb. trudov po mater. 66-oy nauchno-metodich. i nauchno-issled. konf. MADI (GTU) – M.: MADI (GTU), 2010. – S. 212–215.

4. Hovavko I.Yu. Ekologicheskoe regulirovanie rinkov motornih topliv // Vestnik Moskovskogo universiteta. Seriya 6. Ekonomika. – 2006. no – 6.

5. Kapustin V. Problemi razvitiya neftepererabotki v Rossiyi // Neft i kapital. – 2006. – no 6.- S.23-27

6. Neftegazovaya vertikal: pererabotka, himiya, marketing. – 2008. – Mart – S. 6 – 7.

7. Ryabova N.D. Adsorbenti dlya svetlih nefteproduktov. Tashkent, FAN, 1975. – 144 s.

8. Near Infrared Spectral Analysis of Gas Mixtures / M.A. van Agthoven, G. Fujisawa, P. Rabito, O.C. Mullins // Applied Spectroscopy, 2002, v.56, no.4, p.593-598.

9. Prediction of gasoline Octane Numbers from Near Infrared Spectral Feature in the Range 660_1215 nm / J.J. Kelly, C.H. Barlow, T.M. Jinguji, J.B. Callis // Analytical Chemistry, 2010, v.61, no.4, p.313_320.

10. Mahmudov M.J., Hayitov R.R., Narmetova G.R. Sovremenniye trebovaniya k motornim toplivam // Rossiyskiy jurnal «Molodoy uchenniy», Kazan, 2014, no.21 (80). – S. 181-183.

11. Mahmudov M.J., Hayitov R.R., Narmetova G.R. Issledovaniye fiziko-himicheskih svoystv avtomobilnogo benzina, poluchennogo iz neftegazokondensatnogo sirya // Rossiyskiy jurnal «Molodoy uchenniy», Kazan, 2014, no.21 (80). – S. 181-183.

12. Yao H.C., Shelef M. / Surface Interactions in the System Re/-Al₂O₃ // J. Catal., 2013, v. 44, no. 3, pp. 392–403.

13. Ahmetov A.F. Razrabotka kombinirovannoy tehnologiyi proizvodstva visokooktanovih neetilirovannih benzinov i aromaticheskih uglevodorodov: Dis. dokt. tehn. nauk.– Ufa: 1986.– 335 s.

14. Nefteprodukti. Metodi ispitaniy. – M.: Standartgaz, 1961. – 980 s.

15. Narmetova G.R. Kolloidno – himicheskie osnovi sozdaniya polifaznih sorbentov dlya gazo – jidko – tverdofaznoy hromatografiyi: Avtoref. dis. … d.h.n. – Tashkent, 1993. – 38 s.

 

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UDC 577.124.5: 633.511

N.R. Khashimova, A.A. Akhunov, M.A. Mamasolieva, M.B. Gafurov.

 SUPERMOLECULAR COMPLEX OF GLICYRRYZINE ACID WITH SALICILIC ACID IS AN ENVIRONMENTALLY SAFE INDUCTOR OF THE STABILITY OF A COTTON

Institute of Bioorganic Chemistry named after Acad A.S. Sadykov, AS RUz, 100125 Tashkent city, Uzbekistan,

E-mail: nigora.khashimova@gmail.com

Abstract. Background. Supramolecular complexes are widely used at present in various areas of the national economy. Pilot studies of the biological activity of the synthesized supramolecular complex of glycyrrhizic acid with salicylic acid (SMK-GK-SK) have shown its effectiveness as an inducer of cotton resistance to pathogens. In this case, the peculiarities of interactions between SMC-GK-SK and the enzymatic system of cotton have not yet been considered.
Purpose.  To study the effect of low concentrations of QMS-HC-SC on the activity of phenylalanine ammonia-lyase and the content of salicylic acid (SC) in cotton leaves.

Methodology: The synthesized SMK-GK-SK is characterized by the spectral IR method. The formation of trans-cinnamic acid was determined spectrophotometrically according to Dubery, the isolation of SC by the O'Donnell method. The content of SC was determined by HPLC.

Originality. The concept of creation of new generation preparations based on glucose from licorice roots as an environmentally safe inductor of cotton resistance was developed for the first time.
Findings. The supramolecular complex of SC with SC in the ratio 2: 1 was synthesized. Treatment of cotton seedlings in low concentrations (10-7 M) SMC_GC-SK increased the activity of phenylalanine ammonia-lyase and increased the content of endogenous SC as compared to control plants. Analysis of the results showed a direct correlation between the activity of phenylalanine ammonia-lyase and the accumulation of free SC in the leaves of cotton in conditions of infection with the pathogen.

Key words: supramolecular complex, glycyrrhizic acid, salicylic acid, phenylalanine ammonia-lyase, pathogen.
Highlights:

* Induction of protective reactions occurs when a combination of HA and SC in a 2:1 composition.
* Supramolecular complex of HA with SC 10-7 M activates phenylalanine ammonia-lyase.
* Supramolecular complex of HA with SC increases the content of SC in cotton

To cite this article: N.R. Khashimova, A.A. Akhunov, M.A. Mamasolieva, M.B. Gafurov. Supermolecular complex of glicyrryzine acid with salicilic acid is an environmentally safe inductor of the stability of a cotton // Uzbek chemical journal.- 2016. – Nr. 4. – Pp. 90-94.

Received:  16.08.2016 Accepted: 21.08.2016 Published: 25.08.2016

References

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4.     Alenkina S.A., K.A. Trutneva, V.E. Nikitina. Change in the Content of Salicylic Acid and in the Activities of Phenylalanine Ammonia-Lyase and Catalase in Wheat Seedling Roots Under the Effect of Azospirillum Lectins // Journal of Stress Physiology & Biochemistry. - 2012. - V. 8.- N 2. - P.110-117.

5.     Vasyukova N.I., Ozereckovskaya O.L. Inducirovannaya ustoychivost` rasteniy i salicilovaya kislota //Prikladnaya biohimiya i mikrobiologiya. - 2007. - T. 43, N 4. - S. 405-411.

6.     Dubery I.A., Smit F. Phenylalanine ammonia-lyase from cotton (Gossypium hirsutum) hypocotyls: properties of the enzyme induced by u Verticillium dahliae phytotoxin // Biochimica et Biophysica Acta. - 1994. - 1207. -P.24-30.

7.     O`Donnell P.J., Jeffrey B., Jones J.B., Antoine F.R., Ciardi J., Klee H.J.. Ethylene-dependent salicylic acid regulates an expanded cell death response to a plant pathogen, Plant J. -2001. - V.25. - P. 315-323.

8.     Metraux J-P. Systemic acquired and salicylic acid: current state of knowledge // Europen Journal of Plant Pathology. 2001. - C.13-18.

9.     Krasavina M.S., Burmistrova N.A., Prudnikov G.A. Pervichnoe deystvie yekzogennoy salicilovoy kislotyi mozhet ne zatragivat` metabolicheskie processyi. VIII mezhdunarodnyiy simpozium "Fenol`nyie soedineniya: fundamental`nyie i prikladnyie aspektyi". 2012. - S.347-353.

10.  Wang LJ, Li SH: The effects of salicylic acid on distribution of 14C assimilation and photosynthesis in young grape plants under heat stress // Acta Horticulture. -2007.- V.738. - R.779-7851.

11.  Horvath E, Szalai G, Janda T: Induction of abiotic stress tolerance by salicyclic acid signaling // J Plant Growth Regul. -2007. - V.26.- P.290-300.

12.  Vasyukova N.I., Zinov`eva S.V., Udalova ZH.V. i dr. // Dokladyi akademii nauk. -2003. -T.391. -N 3. -S.419-421.

13.  Li-Jun Wang, Ling Fan, Wayne Loescher. Salicylic acid alleviates decreases in photosynthesis under heat stress and accelerates recovery in grapevine leaves // BMC Plant Biology. - 2010. -10:34.

 

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EXSPERIMANTAL CHEMISTRY

UDC 544.02

F. T. Adilova, A.A.Ikramov

A NEW PARADIGM FOR THE DESCRIPTION OF CHEMICAL SPACE IN COMPUTER APPLICATIONS: MYTH OR REALITY?

National University of Uzbekistan Institute of Mathematics fatima_adilova@rambler.ru

Abstract. Background. Сhemical space is envisioned as a set of ‘molecular points’ distributed within a multi-dimensional space. Coordinate-based model provides a computationally accessible representation, but has several disadvantages: (1) the space of points associated with coordinate representation is continuous, but the chemical space is inherently discrete; (2) Chemical space is not invariant to the views used to encode molecular information; (3)Computed chemical spaces are generally of very highdimension, so some form of dimensionalityreduction is generally required; (4) in many cases, the components of the representation vectors is a binary or nominal values, which are incompatible with continuous chemical spaces.

Cell-based model, obtained by applying a plurality of disjoint hypercubic cells that cover the corresponding coordinate chemical space. In the set-theoretic sense turns decomposition of chemical space, where each cell has an equivalence class.

Purpose. The networks presentation of chemical space proposed as an attractive paradigm for representing chemical space since they circumvent many of the issues associated with coordinate- and cell-based representations. The aim of this study was to compare the network presentation of chemical space with the coordinate-based  approach.  We would like to get an answer to the question: whether the improved accounting "modelability” (MODI) of original data set predictive efficiency of QSAR models in the coordinate-based or network-based representation of chemical space?

Methodology. The sample of 200 elements and 19 descriptors, including fingerprints was obtained from the CHEMBL database. Calculated assessment of similarity of the compounds based on two metrics (Tanimoto and Voronin), in order to eliminate the activity cliffs. NeuroSolutions software was used for modeling networks on the same sample.

Originality. In this study, using the different sets of descriptors and different criteria of similarity of the compounds compared coordinate and network representations of chemical space, focusing on their possibility to evaluate the “modelability” of initial data set (MODI).

Findings. Initial data set of compounds was taken from CHEMBL, the index of activity is the efficiency Carbonic anhydrase II. While coordinate-based representation showed 40% of  efficiency of MODI calculation, the network-based representation showed only 21%.

Keywords. chemical space, hydrophobicity, the lipophilicity, ligand, target.

Highlights:

* Differential heats of adsorption by zeolites (H₂O) n / Na + clusters.
* The state of water in the matrix of zeolites is close to ice-like.

To cite this article: F. T. Adilova, A.A.Ikramov. A new paradigm for the description of chemical space in computer applications: myth or reality? // Uzbek chemical journal.- 2016. – Nr. 4. – Pp. 95-100.

Received:  02.03.2016 Accepted: 06.05.2016 Published: 25.08.2016

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