VOLUME NR 2
PHYSICAL CHEMISTRY
UDK 536.658:541.183
1T. D. Abdulkhaev, 2Sh. A. Kuldasheva, 2F. G. Rakhmatkariev, 3H. N. Bakhronov
DIFFERENTIAL HEAT AND ISOTHERM OF METHANOL ADSORPTION ON ZEOLITE AgZSM-5
1Namangan Institute of Engineering and Technology, Email: abdulxayev1987@gmail.com , 2Institute of General and Inorganic Chemistry of the Academy of Sciences of the Republic of Uzbekistan, Tashkent, Uzbekistan, 3Tashkent University of Information Technologies named after Muhammad al-Khwarizmi
Abstract. Background. It is known that zeolites belonging to the pentocylgroup have catalytic and adsorption properties. Therefore, it is necessary to carry out fundamental studies of the theoretical foundations of adsorption processes that are formed in them at the molecular-system level.
Purpose. Determination of molecular complexes of methanol ions with metal ions located in AgZSM-5 zeolite channels and arrangement of methanol molecules in proportions on each metal cation.
Methodology. Using a sensitive adsorption calorimetric device, by the adsorption-stoichiometric method, in the study of the interaction of adsorbent-adsorbate molecules in the adsorption of zeolites, the mechanisms of the formation of ion-molecular complexes with the Ag cation and the adsorption of methanol molecules in AgZSM-5 zeolite channels at different stages were studied.
Originality.The mechanism of the formation of nanocomplexes of methanol with a silver cation in the AgZSM-5 zeolite matrix has been studied for the first time.
Findings.The differential heats of methanol adsorption have a staged form, where each stage in the AgZSM-5 zeolite matrix reflects the formation of CH3OH:Ag+ single- and multivariable adsorption clusters. It was revealed that zeolites of the pentocyl group form complexes of silver cations 2CH3OH:Ag+ in straight and side channels.
Key words: Ionic-molecular complexes, AgZSM-5 zeolite, methanol, adsorption calorimeter.
Highlights:
- at each stage of methanol adsorption on AgZSM-5 zeolite, the formation of nCH3OH:Ag+ clusters was noted.
- adsorption of methanol molecules in the zeolite matrix - AgZSM-5 is similar to the state of ice.
References
1. Abdulkhaev T., Kuldasheva Sh., Raхimova G., Aripova M., Toshev Sh. Thermodynamic values of the adsorption of methanol and ethanol molecules in zeolite NH4ZSM-5 //IOP Conf. Series: Earth and Environmental Science 839 (2021) 042074 http://doi:10.1088/1755-1315/839/4/042074
2. Abdulkhaev T.D. Differential heat and isotherm of adsorption of polar and non-polar molecules in NH4ZSM-5 zeolite // Dissertation work for obtaining the degree of Doctor of Philosophy (PhD) in Chemical Sciences.-Namangan Institute of Engineering and Technology.- Namangan.-2020.-108 p. (in Uzbek)
3. Abdulkhaev T.D., Kuldasheva Sh.A., Rakhmatkarieva F.G., Y.Yu. Yakubov. Interaction of methanol molecules with active centers and channels of (NH4)1,35ZSM-5 zeolite // Scientific and technical journal of Namangan Institute of Engineering and Technology.-Namangan.-2019. - No1. - P. 101-105. (in Uzbek)
4. Abdulkhaev T.D., Kuldasheva Sh.A., Yakubov Y.Yu. Interaction of methanol molecules with active sites and channels of zeolite (NH4)1,35ZSM-5 //UNIVERSUM Chemistry and Biology.-Moscow, Russia.-2019.-No.8(62). - P.32-36. (in Russian)
5. Khudayberganova N., Rizaev A., Abduraxmonov E.B. Adsorption properties of benzene vapors on activated carbon from coke and asphalt//E3S Web of Conferences 264, 01022 (2021) CONMECHYDRO – 2021 https://doi.org/10.1051/e3sconf /202126401022
6. S. Kamolov, B. Babaev, A. Ibragimov, Y. Yakubov, A. Abdullaev, B.R. Ibragimov and Jamshid Ashurov. Synthesis, structure and Hirshfeld surface analysis of diaquadinitratobis(4-nitroaniline)copper(II) Scopus base. J: Acta Cryst. (2022). E78 https://doi.org/10.1107 /S2056989022010404. ISSN 2056-9890. Edited by C. Schulzke, Universita¨t Greifswald (in Germany)
7. Bahronov Kh.N., Ergashev O.K., Yakubov Y.Yu. Basic energy characteristics and adsorption properties of ZSM-5 type zeolites //Monograph. Progress Print Publishing House, Tashkent.-2022.-168 P. (in Russian)
8. Bakhronov Kh., Ergashev O. Energy and mechanisms of water vapor adsorption in Cu2+ZSM-5 zeolite in pentasil //Scientific and technical journal of Namangan institute of engineering and technology.-V.6.-Issue (4).-2021. -PP.80-86.
9. Bahronov H.N. Heats of methanol adsorption on high-silica zeolite CuZSM-5 //Universum: chemistry and biology.-2021.-№11(89). -p.92-95. (in Russian)
10. Rakhmatkariev G.U., Boddenberg B., Choi S.V., Bahronov Kh.N. Isotherm, differential heats and entropy of methanol adsorption on zeolite LiZSM-5 //Uzbek chemical journal. -Tashkent. -2001. -No. 6. -S.27-30.X.Niu, K.Wang, Y.Bai, Y.Du, Y.Chen, M.Dong and W.Fan, Selective Formation of Para-Xylene by Methanol Aromatization over Phosphorous Modified ZSM-5, //Zeolites Catalysts.-2020.-10.-484. (in Russian)
11. D.Pan, X.Song, X.Yang, L.Gao, R.Wei, J.Zhang, G.Xiao. Efficient and selective conversion of methanol to para-xylene over stable H[Zn,Al]ZSM-5/SiO2 composite catalyst//Appl. Catal.,-2018. -557.-15–24.
12. J.Li, K.Tong, Z.Xi, Y.Yuan, Z.Hu, Z.Zhu, High-efficient conversion of methanol to p-xylene over shape-selective Mg-Zn-Si-HZSM-5 catalyst with fine modification of pore-opening and acidic properties.//Catal. Sci. Technol.-2016.- 6.-4802–4813.
13. G. Pimenov, V. Skirda, V. Maksimenko, V. Morozov, O. Opanasyuk. Study of the influence of the nature of adsorbed molecules on phase transitions in silicalite of the ZSM-5 type by NMR and X-ray diffraction analysis.//Colloid journal.-2004.-No. No6.-Т.66.-Рp.802-806. (in Russian)
14. Piguzova L.I. New zeolite catalysts for the production of high-octane gasoline from methanol.-M.: TsNIITEneftekhem, 1978. -88 p. (in Russian)
15. Rakhmatkariev G.U., Isirikyan A.A. Complete description of the adsorption isotherm by the equations of the theory of volumetric filling of micropores // Izv.AN SSSR, Ser.khim. -1988. -#11. -p.2644-2645. (in Russian)
To cite this article: T. D. Abdulkhaev, Sh. A. Kuldasheva, F. G. Rakhmatkariev, H. N. Bakhronov. Differential heat and isotherm of methanol adsorption on zeolite AgZSM-5 // Uzbek chemical journal. -2023. – Nr2. - Pp.3-9.
Received: 02.05.2023; Accepted: 22.05.2023; Published: 26.05.2023
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UDK 547.543.38.662
1A. Ziyadullaev, 2A. Eshimbetov, 2Kh. Khojaniyozov
STUDY OF THE STRUCTURE AND QUANTUM CHEMICAL PARAMETERS OF CYANURIC ACID DERIVATIVES
1Tashkent Institute of Chemical Technology, Tashkent, Uzbekistan, 2Institute of Bioorganic Chemistry, Academy of Sciences of Uzbekistan
Abstract. Background. Cyanuric acid (CK, 2,4,6-trihydroxy1,3,5-triazine) is a heterocyclic compound and is widely used in chemistry and industry due to its unique properties and solubility in water, its study is relevant.
Purpose. Theoretical analysis of trivinyl esters of cyanuric acid (2a-4a) and trivinyl cyanurate (2b-4b) using the DFT/defs-TZVP method.
Methodology. Boundary MO analysis, ESP analyzes based on theoretical quantum chemical calculations describing the interaction of vinyl esters of cyanuric acid with chlorine, density functional theory using the DFT/defs-TZVP method, energy difference and energy gap between HOMO-LUMO orbitals were used.
Originality. It is shown that the introduction of chlorine into the CC structure affected the electronic properties of the molecules, including the change in the size of the energy gaps. For the compounds obtained, molecular structure, electronic properties, reactivity (NCI-RDG) and ESP analysis data were obtained. It is proved that the energy gaps observed in the HOMO-LUMO spectra for the studied substances are similar and compatible.
Findings. The results of the ESP analysis showed the formation of positive π-hole potentials in the case of triketo derivatives. The presence of strong attractive and repulsive forces, as well as weak interactions in the case of trivinyl and tri-1,2-dichloroethyl derivatives of the triketo form, is shown by the NCI and RDG plots of the studied compounds. The presence of strong attractive and repulsive forces, as well as weak interactions in the case of trivinyl and tri-1,2-dichloroethyl derivatives of the triketo form, is shown by the NCI and RDG plots of the studied compounds.
Key words: cyanuric acid, electronic structure, DFT, FMO, electrostatic potential, non-covalent interactions.
Highlights:
- chemical composition of the chlorinated vinyl ester compound of cyanuric acid;
- quantum chemical calculations, theory of functional density of substances,
- properties of molecular electrostatic potential;
- electronic properties, reactivity and ESP analysis of the synthesized compound.
References
1. Valadbeigi Y., Effect of Mono- and Di-hydration on the Intramolecular Proton Transfers and Stability of Cyanuric Acid Isomers: A DFT Study //J. Chem. Sci.-2016.-128.- 1237–1244.
2. Zabardasti A., Theoretical calculation of equilibrium constant for keto-enoltautomerism in cyanuric acid // Chem.Heterocycl. Comp.-2007.- 43.-1344–1346.
3. Mukherjee S., Ren J. Gas-phase acid-base properties of melamine and cyanuric acid// J. Am. Soc. Mass Spectrom.-2010.-21.-1720–1729.
4. Petelski A.N., Peruchena N.M., Pamies S.C., Sosa G.L. Insights into the self-assembly steps of cyanuric acid toward rosette motifs: a DFT study // J. Mol. Model.-2017.-23(9).-263.
5. Elango M., Subramanian V., Sathyamurthy N. Nanoclusters of Cyanuric Acid //J. Chem. Sci.-2017.-129.-873–881.
6. Pérez-Manríquez L., Cabrera A., Sansores L.E., Salcedo R. Aromaticity in cyanuric acid// J. Mol. Model.-2011.-17.-1311–1315.
7. She D.-M., Yu H.-L., Huang Q.-L., Li F.-M., Li C.-J. Liquid-Phase Synthesis of Cyanuric Acid from Urea.// Molecules.- 15: 1898-1902 (2010).
8. Klaus Huthmacher, Dieter Most, Cyanuric Acid and Cyanuric Chloride, Ullmann's Encyclopedia of Industrial Chemistry.-2000, http://DOI:10.1002/14356007
9. Wojtowicz J. Cyanuric and isocyanuric acids.-In: Kirk-Othmer Encyclopedia of Chemical Technology.-2004.- 8.-199–218.
10. Bayat Y., Hajighasemali F. Synthesis and characterization of 1,3,5-tris((1/2H-tetrazol-5-yl)methyl)-1,3,5-triazinane-2,4,6-trione.//Chemical Papers.-2017.-71(5).-949.
11. Hanwell M.D., Curtis D.E., Lonie D.C., Vandermeersch T., Zurek E., Hutchison G.R.Avogadro: an advanced semantic chemical editor, visualization, and analysis platform// J.Cheminform.-2012.-17(4).
12. Neese F. The ORCA program system, Wiley Interdisciplinary Reviews: Computational Molecular Science.-2012.-2(1).-73-78.
13. Neese F. Software update: the ORCA program system, version 4.0, Wiley Interdisciplinary Reviews: Computational Molecular Science.-2017.-8(1).-327.
14. Lu T., Chen F.Multiwfn: A multifunctional wavefunction analyzer. //J. Comput. Chem.-2012.- 33.-580-592.
15. Humphrey W., Dalke A.,Schulten K.VMD - Visual Molecular Dynamics. //J. Molec. Graphics.-1996.-14.-33-38.
16. Pearson R.G. Chemical hardness and density functional theory. //J.Chem. Sci.-2005.- 117(5).-369–377.
17. Bendjeddou A., Abbaz T., Gouasmia A., Villemin D. Molecular structure, HOMO-LUMO, MEP and Fukui function analysis of some TTF-donor substituted molecules using DFT (B3LYP) calculations.Int. Res.//J. Pure Appl. Chem.-2016.-12.- 1−9.
18. Miar M., Shiroudi A.,Pourshamsian K.,Oliaey A.R.,Hatamjafari F. Theoretical investigations on the HOMO–LUMO gap and global reactivity descriptor studies, natural bond orbital, and nucleus-independent chemical shifts analyses of 3-phenylbenzo[d]thiazole-2(3H)-imine and its para-substituted derivatives: Solvent and substituent effects. //J. Chem. Res.-2021.-45.-147-158.
19. Boda A., Musharaf Ali S., Rao H., Ghosh S.K.Ab initio and density functional theoretical design and screening of model crown ether based ligand (host) for extraction of lithium metal ion (guest): effect of donor and electronic induction. //J.Mol. Model.-2012.-18.-3507–3522.
20. Parr R.G., Szentpály L., Liu S.Electrophilicity index. //J. Am. Chem. Soc.-1999.-121(9).- 1922-1924.
21. Chattaraj P.K., Sarkar U., Roy D.R.Electrophilicity Index.//Chem. Rev.-2006.-106.-2065-2091.
22. Politzer P., Murray J.S. The fundamental nature and role of the electrostatic potential in atoms and molecules. //Theor. Chem. Acc.- 2002.-108.-134-142.
23. Murray J.S., Politzer P. The electrostatic potential: an overview, Wiley Interdiscip.// Rev. Comput. Mol. Sci. -2011.-1(2):153-163.
24. Politzer P., Murray J.S. σ-holes and π-holes: Similarities and differences. //J. Comput. Chem.-39(9).-464-471.
25. Wheeler S.E., Bloom J.W.G.Anion–π interactions and positive electrostatic potentials of N-heterocycles arise from the positions of the nuclei, not changes in the π-electron distribution. //Chem. Commun.-2014.-50.- 11118-11121.
26. Johnson E.R., Keinan S., Mori-Sánchez P., Contreras-García J., Cohen A.J., Yang W.Revealing Noncovalent Interactions.// J. Am. Chem. Soc.-132(18).-6498–6506.
27. Tan S.L., Jotani M.M., Tiekink E.R.T. Utilizing Hirshfeld surface calculations, non-covalent interaction (NCI) plots and the calculation of interaction energies in the analysis of molecular packing ActaCryst.-2019.-E75.-308–318.
28. Laplaza R., Peccati F., Boto R.A., Quan C., Carbone A., et al.. NCIPLOT and the analysis of noncovalent interactions using the reduced density gradient. Wiley Interdiscip.// Rev.: Comput. Mol. Sci.-2021.-11(2).- e1497.
To cite this article: A. Ziyadullaev, A. Eshimbetov, Kh. Khojaniyozov. Study of the structure and quantum chemical parameters of cyanuric acid derivatives // Uzbek chemical journal. -2023. – Nr2. - Pp.9-17.
Received: 05.05.2023; Accepted: 25.05.2023; Published: 26.05.2023
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UDC 620.193
O. R. Makhammadiyev
INVESTIGATION OF STEEL SURFACE MORPHOLOGY IN (3D) FORMAT USING AN ATOMIC FORCE MICROSCOPE
Tashkent Chemical and Technological Institute, email: muxammadiyevo@mail.ru
Abstract. Background. Iron and carbon steel corrode in aggressivemedia. Inhibitors form adsorption layers on the metal surface, thus protecting them.
Purpos. To study the surface morphology of steel-20 samples in the form of a plate using atomic force microscopy (AFM) in the original, in the presence of an inhibitor and without an inhibitor (3D) format, as well as the corrosion rate and the effectiveness of inhibitor protection by the gravimetric method.
Methodology. The surface morphology of steel-20 samples in the form of a plate (3D) in HCl medium (in the presence of an inhibitor) was studied by atomic force microscopy, and the corrosion rate and protective effectiveness of the inhibitor were studied by gravimetry.
Originality. The newly created inhibitor based on ethylenediaminewas adsorbed on the metal surface by forming a complex compound with Fe2+ ions and formed a thin film, thus steel plates were not affected by aggressive environment. Corrosion protection of steel-20 metal by an ethylenediamine-based inhibitor was studied for the first time using atomic force microscopy and the results were analyzed. Also, in the presence of this inhibitor, the corrosion coefficient at different concentrations were determined.
Findings. When the surface of the annealed steel plate was examined by means of an atomic force microscope, it was observed that the surface was flat and there were few depressions. Corrosion changes on the surface of the steel plate in an aggressive environment in the presence of EPGT composite inhibitor were almost not detected.
Key words: atomic force microscope, steel-20, НСl solution, corrosion inhibitor, surface morphology.
Highlights:
- the initial state of the steel plate was studied under a microscope
- the corrosion condition of the steel plate was studied
- analysis of the inhibited state of the plate
References
1. Raveendran Sindhu., Ashok Pandey. Microbial Poly-3-Hydroxybutyrate and Related Copolymers // Elseveir. in Industrial Biorefineries & White Biotechnology.-2015.-Pages 575-605.
2. Mohamed Shameer., Mohamed Nishath. Exploration and enhancement on fuel stability of biodiesel: // Elseveir. A step forward in the track of global commercialization in Advanced Biofuels.- 2019.-Pages 181-213.
3. Aastha Dutta. In Spectroscopic Methods for Nanomaterials Characterization // Elseveir. in Industrial Biorefineries & White Biotechnology.-2017.-Pages 1102-1109.
4. Taha Roodbar Shojaei, Saman Azhari. In Emerging Applications of Nanoparticles and Architecture Nanostructures // Fabrication, functionalization, and dispersion of carbon nanotubes. Elseveir.-2018.-Pages 1131-1139.
5. Popyonova L. I., Lisovsky R. A., Radionova L. V. Development of a setup for the study of corrosion of metals by the gravimetric method // Concept. - 2015. - No. 06. - P.1-7. (in Russian)
6. Jeenat Aslam., Ruby Aslam., Afroz Aslam., Chaudhery Mustansar Hussain., Mehtab Parveen. Gravimetric, electrochemical, and morphological studies of an isoxazole derivative as corrosion inhibitor for mild steel in 1M HCl // Arabian Journal of Chemistry.-Volume 13. Issue 11.- November 2020.-Pages 7744-7758.
7. Francis O. Edoziuno, Benjamin U. Odoni, Adeolu A. Adediran, Joshua O. Okeniyi and Esther T. Akinlabi. Analyses of the Gravimetric and Electrochemical Effects of C16H13N3 O3 on Mild Steel Corrosion in 0.5 M H2SO4 // International Conference on Engineering for Sustainable World. Journal of Physics: Conference Series.-2019.-Pages 2141-2154.
8. O. A. Chepkasova, A. A. Selezneva, A. I. Sadilov, and S. V. Khmelev. Corrosion of metals // Young scientist. - 2015. - No. 23 (103). - S. 260-261. (in Russian)
9. N.G. Katz. Analysis of polarization curves of steel and magnesium alloys // Tekhnicheskie nauki.-2016.-No. 2 (50). – P. 193-198(in Russian)
10. N.G. Katz, S.V. Vasiliev, D.S. Kalinkina, D.V. Konovalenko. Polarization characteristics of metallic materials // Technical sciences.-2016.-No. 1 (49).-P.138-143. (in Russian)
11. Ganiev I.N., Sodikova S.S., Saidzoda R.Kh., Alikhonova S.J. Influence of copper additives on the corrosion-electrochemical behavior of high-purity zinc in NaCl electrolyte // Bulletin of the South Ural State University. Ser. Metallurgy.-2020.-Vol. 20. No. 4.Pp. 14–22. (in Russian)
12. Makhammadiyev O.R. Mahalliy khomashelar asosida metal corrosion sining oldini olvchi corrosion inhibitorlarini olish technology blue ishlab chikish. Thesis. 2023. -B. 75-83. (in Russian)
To cite this article: O. R. Makhammadiyev. Investigation of steel surface morphology in (3D) format using an atomic force microscope // Uzbek chemical journal. -2023. – Nr2. - Pp.17-22.
Received: 28.04.2023; Accepted: 25.05.2023; Published: 26.05.2023
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INORGANIC CHEMISTRY
UDK.541.123.4
1B. B. Akhmedov, 2J. S. Shukurov, 3KH. KH. Turayev, 4N. K. Olimov
SOLUBILITY POLYTHERM OF THE H4PCN2O5 • NH2C2H4OH – [10% C10H11ClN4 + 90%C2H5OH] – H2O SYSTEM
1Samarkand State University named after Sh. Rashidov, Samarkand, 2UzR FA Institute of General and Inorganic Chemistry,Tashkent, 3Termez State University, Surkhandarya, 4Tashkent Pharmaceutical Institute, Tashkent, E-mail: bakhtiyor.akhmedov.11@gmail.com
Abstract. Background. The synthesis of effective drugs that exhibit both stimulating and insecticidal effects and the study of the mechanisms of their action on agricultural crops is of current interest.
Purpose. In order to obtain physiologically active preparations with insecticidal properties at the same time, it consists in studying the interaction of components consisting of phosphate carbamidomonoethanolammonium, acetamiprid and ethanol.
Methodology. The nitrogen of amino group in urea by spectrophotometric method (GOST 20851). Phosphorus P2O5 in phosphate was analyzed using Photocalorimeter KFK-3.
Originality. The interaction of components consisting of phosphate carbamidomono- ethanolammonium, acetamiprid and ethanol in an aqueous solution was studied, and polythermal solubility diagrams were constructed based on them.
Findings. Polythermal solubility diagram of H4PCN2O5 • NH2C2H4OH – [10% C10H11ClN4 + 90%C2H5OH] – H2O system in the temperature range from - 36°C to 72°C was constructed using two-component systems and internal cuts. The phase boundaries of ice, acetamipyride, phosphate carbamidomonoethanolammonium, and urea were identified in the diagram.
Key words: insecticide, physiologically active substance, solubility diagram, temperature, urea, phosphate carbamidomonoethanolammonium, acetamiprid.
Highlights:
- received scientific information on the interaction of the components water, phosphate carbamidomonoethanolammonium andacetamipyride;
- based on the interaction of components, a polythermal solubility diagram of the system was drawn.
References
1. Zh. Sh. Bobozhonov, A. A. Sidikov, Zh. S. Shukurov, study of solubility of СН3СООН - CO(NH2)2 - H2O system // Journal of Chemical Technology and Metallurgy.-58. 2. 310. (2023)
2. B.G.Y.M. Zoumenou, M. P Aïna, I. I. Toko, et al. Occurrence of Acetamiprid Residues in Water Reservoirs in the Cotton Basin of Northern Benin. Bull Environ Contam Toxicol 102, 7–12 (2019). https://doi.org/10.1007/s00128-018-2476-4
3. B. B. Akhmedov, J. S. Shukurov. Рolythermic solubility of the system HOOC-COOH •NH2C2H4OH - [10%C10H11ClN4 + 90%C2H5OH] – H2O // Uzbek Chemical Journal.- 5. 3.-2022.
4. N. Simon-Delso & V. Amaral-Rogers & L. P. Belzuncesand and others. Systemic insecticides (neonicotinoids and fipronil): trends, uses, mode of action and metabolites // Environ Sci Pollut Res Int.-22(1).- 5.-2015 https://doi.org/10.1007/s11356-014-3470-y
5. S.C. Bhatla, (2018). Plant Growth Regulators: An Overview. In: Plant Physiology, Development and Metabolism. Springer, Singapore. https://doi.org/10.1007/978-981-13-2023-1_14
6. S. Macfadyen, D. C. Hardie, L. Fagan, K. Stefanova, K. D. Perry, H. E. DeGraaf, J. Holloway, H. Spafford, P. A. Umina. Reducing insecticide use in broad-acre grains production. -an Australian study. 9,1(2014) https://doi.org/10.1371/journal.pone.0089119
7. Zh. S. Shukurov., E. S. Khusanov., M. Sh. Mukhitdinova., and A. S. Togasharov. //Russ.J.Inorg. Chem. 66,902(2021) https://doi.org/10.1134/S0036023621060176
8. J. E. Taylor and C. A. Whitelaw. New Phytol.-151, 323 (2001). https://doi.org/10.1046/j.0028-646x.2001.00194.x
9. A. A. Sidikov, A. S. Toghasharov, J. S. Shukurov, Tukhtaev, S.// Russ. J. Inorg. Chem.-66. -1554(2021) https://doi.org/10.1134/S003602362110017X
10. Zh. S. Shukurov, S. S. Ishankhodzhaev, M. K. Askarova, S. Tukhtaev // Russ. J. Inorg. Chem., 55,1630 (2010) https://doi.org/10.1134/S0036023610100220
11. S. V. Veselova, G. F. Burkhanova, T. V. Nuzhnaya, et al.//Russ. J. Plant. Physiol.-63, 609 (2016). https://doi.org/10.1134/S1021443716050150
12. Y. A. Mubarak. Production of Crystalline Urea Phosphate using the Untreated Jordanian et Process Phosphoric Acid // Department of Chemical Engineering, University of Jordan. Engineering Sciences.-38, 61 (2011)
13. Sh. Sh. Khamdamova and S. Tukhtaev. Comp. Mater.2, 89 (2017).
14. A. A Sidikov, A.S. Toghasharov //Russ. J. Inorg. Chem. 67, 2148(2022). https://doi.org/10.1134 /S0036023622601155
15. V. G. Skvortsov, O. V. Kol’tsova, Yu.Yu. Pyl’chikova, et al., Vestn. Chuvash. Gos. Pedag. Univ. 2, 101 (2009).
16. S. V. Veselova, G. F. Burkhanova, T. V. Nuzhnaya, et al, Biomika 10, 387 (2018). https://doi.org/10.31301/2221-6197.bmcs.2018-50
17. T. Raghavendra and Y. R. Reddy, Indian J. Agric. Res. 54, 404 (2020).
18. A. S. Noreen, S. Mahmood, S. Faiz, et al., Cott. Prod. Uses 119 (2020). https://doi.org/10.1007/978-981-15-1472-2_8
19. A. Yu. Tsyplenkova, O. V. Kol’tsova, N. N. Lobanov, M. A. Yershov, V. G. Skvortsov, Butl. Comm. 36, 146 (2013). https://doi:jbc01/13-36-11-146 [in Russian].
20. N. K. Balabaev, M. N. Rodnikova, I. A. Solonina, et al. //Russ. J. Phys. Chem.-91, 195 (2017). https://doi.org/10.1134/S0036024417010058
21. K. A. Turayev, A. S. Togasharov, S. Tukhtaev. // Journal of Chemical Technology and Metallurgy. -57. 5 (2022)
22. A. B. Ibragimov, Z. M. Ashurov, A. B. Ibragimov, et al.//Russ. J. Coord. Chem.-43, 380 (2017). https://doi.org/10.1134/S1070328417060021
23. C. Broekgaarden, L. Caarls, I. A. Vos, et al.//Plant. Physiol.-169, 2371 (2015).
24. N. Simon-Delso & V. Amaral-Rogers & L. P. Belzuncesand. et al. Systemic insecticides (neonicotinoids and fipronil): trends, uses, mode of action and metabolites Environ Sci Pollut Res 22, 5–34 (2015). https://doi.org/10.1007/s11356-014-3470-y
25. S. B. Singh, G. Kulshrestha. Residues of Thiamethoxam and Acetamaprid//Two Neonicotinoid Insecticides, in/on Okra Fruits (Abelmoschus esculentusL). Bull Environ Contam Toxicol 75, 945 (2005). https://doi.org/10.1007/s00128-005-0841-6
26. P. S. Shera, V. Kumar, and V. Jindal, Sucking Pests of Crops (Springer, Singapore, 2020). https://doi.org/10.1007/978-981-15-6149-8_8
27. Shi, Z., Dong, W., Xin, F. et al. Characteristics and metabolic pathway of acetamiprid biodegradation by Fusarium sp. strain CS-3 isolated from soil. Biodegradation 29, 593(2018). https://doi.org/10.1007/s10532-018-9855-8
28. A. S. Trunin and D. G. Petrova, Visual-Polythermal Method (Kuibyshev, 1977) [in Russian].
29. V. A. Klimova, Basic Micromethods for Analysis of Organic Compounds (Khimiya, Moscow, 1975) [in Russian].
30. Zh. Sh. Bobozhonov, Zh. S. Shukurov, A. S. Togasharov, M. Kh. Akhmadzhonova.// Russ. J. Inorg. Chem. 66. 1031(2021) https://doi.org/10.1134/S0036023621070032
31. S.S Khamdamova. Interaction of components in water system with calcium di-urea-chlorate and urea phosphate. Proceedings of Universities.// Applied Chemistry and Biotechnology.-2017;7(2):9-15. [in Russian]. https://doi.org/10.21285/2227-2925-2017-7-2-9-15
32. E.S. Khusanov, J.S. Shukurov, A.S. Togasharov, B.A. Akhmedov, S. Tukhtayev // Composite materials.-2021.-V.4.-P.210 [in Uzbek].
33. Xi Zhao, Ali Farajtabar, Hongkun Zhao, and Gui Han.//J. Chem. Eng.-64.8.3505 (2019) https://doi.org/10.1021/acs.jced.9b00294
To cite this article: B. B. Akhmedov, J. S. Shukurov, KH. KH. Turayev, N. K. Olimov. Solubility polytherm of the H4PCN2O5 • NH2C2H4OH – [10% C10H11ClN4 + 90%C2H5OH] – H2O system // Uzbek chemical journal. -2023. – Nr2. - Pp.23-28.
Received: 12.05.2023; Accepted: 26.05.2023; Published: 26.05.2023
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UDK 541.123.3
O. O. Rakhmonov, Zh. S. Shukurov, A. S. Togasharov
OBTAINING A PHYSIOLOGICALLY ACTIVE SUBSTANCE FROM THE WASTE OF A COTTON CLEANING PLANT
Institute of General and Inorganic Chemistry, Academy of Sciences of the Republic of Uzbekistan, E-mail: oxunjonrahmonov94@gmail.com
Abstract. Background. In cotton growing, the problem of creating effective defoliants of complex action, providing high-quality shedding of cotton leaves and opening of bolls, is an urgent problem. It is advisable to use chlorate-containing preparations in conjunction with physiologically active substances, due to the negative effect, which is expressed in twisting the leaves and burning the boxes.
Purpose: Extraction of citric and malic acids from the waste of a cotton ginning plant (OHOZ), study of the process of obtaining a new physiologically active substance based on them.
Methodology. Citric and malic acids contained in OHOZa were isolated by the extraction method. The density of the extracted extracts (GOST 31992.1-2012) was determined on a pycnometer, the viscosity was determined on a VPZh viscometer, the refractive index was determined on a PAL-BX/RI refractometer, and the pH value was determined on a FE20 METTLER TOLEDO pH.
Originality. Citric and malic acids were separated from the composition of OHOZ by extraction using hydrochloric acid, the resulting acidic extract was neutralized with monoethanolamine HO-(CH2)2-NH2 and a physiologically active substance was obtained.
Findings. Cotton gin waste, cleaned of impurities, after drying at 90-100°C, was extracted with 1, 2, 3, 4 and 5% hydrochloric acid at 25°C, while determining the temperature, density, viscosity, pH and refractive index solutions.
Key words: physiologically active substance, monoethanolamine, extraction, neutralization, viscosity, density, pH value.
Highlights:
- citric and malic acids were isolated from OHOZ;
- the rheological properties of the isolated acid extracts [HCl + OHOZ] were studied;
- by neutralizing acidic extracts with MEA, a physiologically active substance was obtained
References
1. Togasharov A.S., Shukurov Zh.S., Tukhtaev S. et al. New defoliants based on chlorates and technogenic wastes of cotton ginning plants.-T .: Navruz, 2019. (in Russian)
2. Togasharov A.S., Tukhtaev S. Obtaining a new defoliant with physiological activity based on local raw materials // Uzbek chemical journal. – Tashkent.-2014. - No. 3. – P.30-34. (02.00.00. No. 6) (in Russian)
3. Maksudov I.T. Scientific foundations and development of an integrated technology for the processing of secondary raw materials and waste from the primary processing of raw cotton in order to create a waste-free production: Avtoref... doc. tech. nauk.-Kostroma, 1986.-50 p. (in Russian)
4. Sadykov A.S. Cotton is a miracle plant.-M.: Nauka, 1985.-143 P. (in Russian)
5. Narkhodzhaev A.Kh., Tukhtaev S., Adilova M.Sh., Isakova D. Plant growth stimulants from the waste of primary processing of raw cotton//X "Uzbekistonda tabiy birikmalar kimyosining rivozhi va kelazhagi". Tabiy birikmalar kimyosi department sining 60 yililiga bagishlangan ilmiy conference materiallari.- Tashkent.-27-28 April 2007.-119-120 p. (in Russian)
6. Sadykov A.S., Mednikov A.I., Turulov A.V., Shukurgina D.A. Production of citric and malic acids from cotton leaves and waste from the cotton ginning industry. - Tashkent: From the Academy of Sciences of the Republic of Uzbekistan, 1956.-23 p. (in Russian)
7. Dadamukhamedova N., Akhmadjonova M., Sidikov A., Khushvaktov M., Togasharov A. Study of the solubility of the components of the system sodium dicarbamide chlorate - malic acid monoethanolamine - water // Universum Technical Sciences. – 2022.- No. 9 (102). – P.26-29 (in Russian)
8. Sidikov A.A. [and etc.] Solubility in systems including sodium monocarbamidochlorate, monoethanolamine nitrate and triethanolamine nitrate, Univer.:tech.sc.:elec.sc.j.2020.12(81). https://7universum.com/ru/tech/archive/item/11138
9. Adilova M.T., Narkhodzhaev A.Kh., Tukhtaev S., Kholikulovich O.M. Physical and chemical bases for obtaining nitrogen fertilizers containing growth-stimulating substances // Universum Technical Sciences. - (2020 - No. 9 (78) (in Russian)
10. Togasharov A.S., Tukhtaev S. Fiziologik faollikga ega yangi defoliant olish // Chemistry and Chemical Technology. – Tashkent.-2015. - No. 1. – P.10-13. (02.00.00. No. 3) (in Russian)
11. Schwartzinbach G., Flashka G. Complex titration. -M.: Chemistry, 1970. -360 p. (in Russian)
12. Interaction of monoethanolamine with malic acid // Journal of Inorganic Chemistry. -2005. - T. 50. - No. 11. – P.1897-1901. (in Russian)
13. Baram N.I. Syntheses based on citric and malic acids: Author's abstract .... cand. chem. Sciences.-Tashkent, 1964.-19 P. (in Russian)
14. Larson A.J., Gwathmey C.O., Hayes R.M. Cotton defoliation and harvest timing effects on yields, quality and net revenues // Journal Cotton Science. -2002. - Vol.6. - P. 28-33.
To cite this article: O. O. Rakhmonov, Zh. S. Shukurov, A. S. Togasharov. Obtaining a physiologically active substance from the waste of a cotton cleaning plant // Uzbek chemical journal. -2023. – Nr2. - Pp.28-33.
Received: 02.05.2023; Accepted: 25.05.2023; Published: 26.05.2023
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UDK 541.123.3.
N. A. Erkaeva, A. T. Kaipbergenov, B. Kh. Kucharov, A. U. Erkaev
STUDY OF THE PROCESS OF OBTAINING POTASSIUM PERCARBONATE
Tashkent Institute of Chemical Technology
Abstract. Background. Among household chemicals, bleaching agents stand out: for bleaching linen and auxiliary agents used in the washing process. In both cases bleaching agents are used.
Purpose is to develop a technology for producing potassium peroxycarbonate from potassium carbonate in the presence of hydrogen peroxide.
Methodology. Chemical, radiographic, electron microscopic, isothermal methods of analysis.
Originality. Data on the solubility of K2CO3 -H2O2-H2O at -10 and 00C were obtained. The liquidus curve of the solubility diagram of the K2CO3 -H2O2-H2O system, at the studied temperatures, is characterized by the presence of three branches of crystallization of the initial components and a new compound of the composition - K2CO3∙3H2O2.
Findings. A method has been developed for the preparation of sodium and potassium peroxycarbonates from potassium and sodium carbonates in the presence of hydrogen peroxide. Crystallization is carried out in a polythermal mode, and the slow cooling of the saturated solution causes the formation of a coarse-crystalline precipitate of the peroxide compound, with lamellar and cylindrical particles, up to 1-3 mm.
Key words: system, component, solution, crystallization, isotherm, technology, potassium carbonate, solubility, hydrogen peroxide.
Highlights:
- the product of the interaction of potassium carbonate and hydrogen peroxide;
- potassiumpercarbonate is formed in the form of K2CO3•3H2O2;
- peroxycarbonates from potassium and sodium carbonates in H2O2.
References
1. Budaragin A. N. Modern trends in the household chemicals market in Russia. DowCorning Solutions / A. N. Budaragin // Household Chemistry. - 2006. - No. 23. - p.8. (in Russian)
2. Kotomin A. A., Yakimchuk O. D. Study of the detergent effect of SMS compositions. Household Chemistry. - 2005. - No. 20. - P.23. (in Russian)
3. Erkaeva N.A., Kucharov B.Kh., Erkaev A.U., Reimov A.M., Kaipbergenov A.T. Development of technology of potassium percarbonate production. // Science and education in Karakalpakstan. - Nukus. -2019. -#1. - Rr. 26-33. (in Russian)
4. Erkaeva N.A., Kucharov B.Kh., Abitov A.R., Kaipbergenov A.T. Isothermal diagram of the solubility of the potassium carbonate-potassium bicarbonate-water system. // Proceedings of VII Int. scientific-pract. conf. “Trends and prospects for the development of science and education in the context of globalization”. - Pereyaslav-Khmelnitsky, October 30-31, 2015. - Issue. 8. - S. 520-523. (in Russian)
5. Obtaining chemical bleaches based on potassium carbonate, sodium sulfate and hydrogen peroxide / N.A. Erkaeva, Z.A. Allanazarova, B.Kh. Kucharov, A.T. Kaipbergenov, A.U. Erkaev. / 2015 Yil “Keksalarni e’zozlash yili” ga bagishlangan “Fan va ta’lim-tarbiyada ilgor tazhribalar: tadqiq va natizhalar” Mavzusidagi Republic of ilmiy-nazariy va amaliy anzhuman materiallari. -Nukus.-2015.-p.342-344. (in Russian)
6. Handbook of solubility. T.II, second book. - L.: Nauka, 1969. - 1171 p. (in Russian)
7. Bruni G., Meneghini D. Zanorg. Chem. 64, 193 (1909); Handbook of fusibility systems. -M.-L.: Publishing House of the Academy of Sciences of the USSR, 1961. -V.1. -771 p. (in Russian)
8. M.E. Pozin, R.Yu. Zinyuk. Physical and chemical foundations of inorganic technology. Chapter 5 -L.: Chemistry, 1985.- 384 p. (in Russian)
9. Sokolovsky A.A., Yakhontova E.L. Application of equilibrium solubility diagrams in the technology of mineral salts. - M.: Chemistry, 1982. -264 p. (in Russian)
10. Van't Hoff Ya.G. Ocean salt deposits. - L.: ONTI himteoret, 1936. -344 p. (in Russian)
11. Kovba L.M., Trunov V.K. X-ray phase analysis.–M.: MGU, 1969.-160 p. (in Russian)
12. Giller Ya.L. Tables of interplanar distances. In 2 vols. - M.: Nedra, 1966. - 330 p. (in Russian)
13. Nedoma I. Interpretation of X-ray powders. - M.: Metallurgy, 1975. - 423 p. American file cabinet ASTM. Diffraction Datacards and Alphabetikal and Group Numerical Index of X-Ray Diffraction Data. -New York: Publishing House of the American Society for Testing and Materials, 1973. - 15p. (in Russian)
14. Mirkin L.I. Handbook of X-ray diffraction analysis of polycrystals.-M, 1991.-863 p. (in Russian)
15. Lyman C.E., Goldstein J.I., Williams D.B.; Ackland D.W., Vonharrach S., Nicholls A.W., Statham P.J., (1994) High-Performance X-Ray-Detection in a new analytical Electron-Microscope. // Journal Of Microscopy. -Oxford. -V.176. - P. 85-98, Part: 2
16. Goldstein G. I., Newbury D. E., Echlin P., Joy D. C., Fiori C., Lifshin E., (1981). Scanning electron microscopy and X-ray microanalysis. -New York: Plenum Press.ISBN 0-306-40768-X.
To cite this article: N. A. Erkaeva, A. T. Kaipbergenov, B. Kh. Kucharov, A. U. Erkaev. Study of the process of obtaining potassium percarbonate // Uzbek chemical journal. -2023. – Nr2. - Pp.33-38.
Received: 02.05.2023; Accepted: 22.05.2023; Published: 26.05.2023
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UDK 541.621.793.3;541.124/128
F. N. Fuzailova, V. P. Guro, M. A. Ibragimova, U. R. Ernazarov, Z. A. Nabieva, A. T. Dadakhodzhaev
PERSPECTIVE OF ISOLATION OF NICKEL SUITE FROM SOLUTIONS OF CRYSTALLIZATION OF COPPER SULPHATE
Institute of General and Inorganic Chemistry, Academy of Sciences of the Republic of Uzbekistan, e-mail foozayl_17.06@mail.ru
Abstract. Background. A by-product of copper production of Almalyk MMC JSC is copper sulfate GOST 19347-99. One of its impurities is nickel.
Purpouse. Development of a method for extracting nickel from copper sulphate.
Methodology. Object of study: solutions and crystallization product of copper sulphate of the sulphate shop. The composition of the phases was determined by the method of physicochemical analysis according to Skreinemakers, the analysis of samples was performed on a Perkin-Elmer 3030B AAS.
Originality. The possibility of extracting impurity ions of nickel (II) from the crystallization solution of copper sulphate by fractional crystallization and selective sorption has been revealed.
Findings. Methods have been developed for the precipitation of Ni (II) ions in the form of nickel carbonate with conversion to nickel vitriol; fractional crystallization of copper sulphate with precipitation from mother liquors of nickel sulphate, selective sorption of copper on PuroliteS-960 resin in the presence of Ni(II) ions.
Key words: copper sulfate, mother liquor, crystallization, impurity Ni (II) ions, selective sorption, ion exchange resin
Highlights:
- mother liquors of copper sulphate recrystallization
- enrichment of mother liquors with nickel impurity ions;
- Cu (II) is adsorbed on the PuroliteS-960 resin, but Ni (II) is not.
References
1. PratimaMeshram, Abhilash&BanshiDharPandey (2018): Advanced review on extraction of nickel from primary and secondary sources, Mineral Processing and Extractive Metallurgy Review, https://doi.org/10.1080/08827508.2018.15.14300
2. Dadakhodzhaev A.T., Mamataliev N.N. Methods for extracting nickel from industrial waste and its application // Universum: technical sciences: electron.nauchn. magazine - 2019. - No. 4 (61). - URL: https://7universum.com/en/tech/archive/item/7217 (in Russian)
3. Arslanoğlu Hasan, Yaraş Ali. Recovery of molybdenum, cobalt and nickel fromspent hydrodesulphurization catalyst through oxidizing roast followed by sodium persulfate leaching.Sustainable Materials and Technologies 28 (2021) e00286. https://doi.org/10.1016 /j.susmat.2021.e00286
4. Patent of the Republic of Uzbekistan No. 5408. Dudnik A.L., Khaspoladov V.Sh., Aranovich V.L., Dovchenko V.A., Rudenko B.I., Gurin V.D. Method for disposal of waste mother liquors of copper sulphate production. Appl. No. IAP 9800149.1.- Prior. 03/05/1998. - Register. 08/19/1998. (in Russian)
5. Khaspoladov V.Sh., Guro V.P., Ibragimova M.A. Isolation of nickel vitriol with incidental extraction of Chevrell's salt from solutions for utilization of copper refining electrolyte at Almalyk Mining and Metallurgical Company // Uzb. chem. and. -Tashkent. -2007. - No. 2. -WITH. 44-48. (in Russian)
6. Guro V. P. Nickel hydrometallurgy from polymetallic copper ore and technogenic raw materials in Uzbekistan // Uzb. chemical and. - Tashkent. -2008.- No. 4.- S. 85-91. (in Russian)
7. Yakubov M.M., Kholikulov D.B., Boltaev O.N., Abdukodirov A.A. Possibilities of extracting valuable components from mother liquors formed during the production of copper sulphate in the conditions of JSC "Almalyk MMC"//Journal of Advancesin Metallurgy and Engineering Technology. -V. 2(2). -2020.- P.67-73 (in Russian)
8. Guro V. P. Ammonium perrhenate purification and rhenium recovery from heat-resistant rhenium nickel superalloys, Proceeding of 21st International Conference on Metallurgy and Materials (Metal 2012). - Brno, Czech Republic, 23–25 May 2012.
9. Ya. Agapova, Z. S. Abisheva, S. K. Kilibaeva, Zh. E. Yakhiyaeva. Electrochemical processing of technogenic wastes of rhenium-containing heat-resistant nickel alloys in sulfuric acid solutions. //TsvetnyeMetally.-2017. -No. 10. -Рp. 69–74. http://DOI:10.17580/tsm.2017.10.08
10. Tsakiridis P.E., Agatzini-LeonardouS.Process for the recovery of cobalt and nickel in the presence of magnesium from sulphate solutions by Cyanex 272 and Cyanex 302.// Minerals Engineering. -17. -2004. -P.913–923
11. Patent RU 2216407. Method for separating nickel from copper in solutions. Authors: Voronin N.N., Devyatkin P.N., Shashkov A.A. Appl. 2002.03.04, publ. 2003.11.20. (in Russian)
12. Patent RU 2411010 C1. Method for producing cathode nickel Authors: Khagazhaev D.T., Miroevsky I.O., Popov B.P., et al. 99105529/02, 1999.10.03, publ. 1999.10.11. (in Russian)
13. Chemistry and chemical technology. Chemist's reference book 21.-p.255 https://chem21.info /info/476608/(in Russian)
14. Patent RU 2449033, C1, IPC C22B 23/00 C22B 15/00; C22 3/44; Method for processing copper-nickel sulfate solution. Patent authors Nizov V.A. (RU), Mashchenko V.N. (RU), Bakirov A.R. (RU) Application: Application: 2010146023/02, 11.11.2010; Published: 04/27/2012, Bull. No. 12. (in Russian)
15. Coman V., Robotin B., Ilea P.. Nickel recovery/removal from industrial wastes: Resources, Conservation and Recycling. -Volume 73. -April 2013. -Pages 229-238 https://doi.org/10.1016/j.resconrec.2013.01.019
16. Patent RU 476611 C2. Extraction of metals from waste containing copper and other valuable metals. Authors: Roth Jean-Lhu, Solve Christophe, App. 2010119644/02, 10.10.2008. Published 02/27/2013 (in Russian)
17. Japanese patent N 549599, class. From 01G 53/10, 1979 (in Russian)
To cite this article: F. N. Fuzailova, V. P. Guro, M. A. Ibragimova, U. R. Ernazarov, Z. A. Nabieva, A. T. Dadakhodzhaev. Perspective of isolation of nickel suite from solutions of crystallization of copper sulphate // Uzbek chemical journal. -2023. – Nr2. - Pp.38-44.
Received: 06.03.2023; Accepted: 13.04.2023; Published: 26.05.2023
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UDK 532.64 (088.8);546.719
H. F. Adinaev, E. T. Safarov, V. P. Guro, S. N. Rasulova, G. M. Parmonov, Z. B. Rakhimjonov
RETENTION OF RHENIUM DURING THE ROASTING OF MOLYBDENITE CONCENTRATE IN FLUIDIZED BED FURNACE
Institute of General and Inorganic Chemistry, Academy of Sciences of the Republic of Uzbekistan,
Abstract. Background. Cinder of the industrial molybdenum product of Almalyk MMC JSC contains, %: Mo³32, SiO2£11; As£0.07; Cu£2 (1st grade); 2.0-3.0 (2nd); >3.0 (3rd grade); Р (£0.05), WO3 (£0.8); S (£1.5), Re (£0.017). It is obtained by firing at 600°C Mo-concentrate (MoC), rounded with a binder - kaolin, 8-10%.
Purpose: comparative testing of a series of alternative organic binders in the composition of the Mo-concentrate, in order to identify the best composition of the cinder.
Methodology. MoC granules were fired in a fluidized bed furnace and their composition and physicochemical properties were controlled.
Originality. Binders for granulation of Mo-concentrate have been developed, alternative to kaolin, providing an increased content of Mo, Au in the cinder, facilitated release of Re into sublimates during firing.
Findings. The composition and properties of Mo-concentrate granules were studied before and after 600°C firing.
Key words: rhenium, molybdenite concentrate, charge, cinder, binder.
Highlights:
- firing of molybdenite concentrate granules was carried out at a temperature of 600°C;
- mixtures based on kaolin and organic binders were applied;
- composition, IR spectra of granulated materials before and after firing were studied;
- during 60 min of firing Re in the solid phase of the granules of charges No 2-5 was absent.
References
1. Palant A. A., Troshkina I. D., Chekmarev A. M. Metallurgiya reniya (Rhenium metallurgy). -Moscow: Nauka, 2007. - 298 p.
2. P.R. Taylor, C. Anderson. Extractive Metallurgy of Rhenium: A ReviewMinerals and Metallurgical Processing, 30, 1. -2013. -59-73.
3. Millensifer, T.A. “Rhenium and rhenium compounds,” Kirk Othmer Encyclopedia of Chemical Technology, John Wiley and Sons, 2010. -Рp. 1-21.
4. Cinder of an industrial product of molybdenum TSh 64-23283880-07:2013. organization standard. - Tashkent: Uzstandart publishing house, 2013. (in Russian)
5. Xiao-binLI, TaoWU, QiushengZHOU, etc.Kinetics of oxidation roasting of molybdenite with different particle sizes.// Transactions of Nonferrous Metals Society of China. -Vol. 31. -Issue 3. - March 2021. -P. 842-852. https://doi.org/10.1016/S1003-6326(21)65543-7.
6. Alina Zagorodnyaya, Zinesh Abisheva, Ainash Sharipova, Saltanat Sadykanova & Ata Akcil (2015). Regularities of Rhenium and Uranium Sorption from Mixed Solutions with Weakly Basic Anion Exchange Resin, Mineral Processing and Extractive Metallurgy Review//An International Journal. -36:6, 391-398, https://doi.org/10.1080/08827508.2015.1039165
7. LeitingShenac, FisehaTesfaye, Xiaobin Li. etc.Review of rhenium extraction and recycling technologies from primary and secondary resources. //Minerals Engineering. -Vol. 161. -15 January 2021. -106719. https://doi.org/10.1016/j.mineng.2020.106719
8. Joseph D. Lessard, Daniel G. Gribbin, Leonid N. Shekhter. Recovery of rhenium from molybdenum and copper concentrates during the Looping Sulfide Oxidation process. //International Journal of Refractory Metals and Hard Materials. -Vol. 44. -May 2014. -Pр 1-6. https://doi.org/10.1016/j.ijrmhm.2014.01.003
9. Turanov, A.N., Karandashev, V.K., Kalashnikova, I.P. et al. Extraction and sorption preconcentration of rhenium with the use of 2-phosphorylphenoxyacetamides. //Russ. J. Inorg. Chem. -62, 1252–1256 (2017). https://doi.org/10.1134/S0036023617090170
10. Brandaleze, E., Bazán, V., Orozco, I. et al. Application of thermal analysis to the rhenium recovery process from copper and molybdenum sulphides minerals. //J. Therm Anal Calorim133, 435–441 (2018). https://doi.org/10.1007/s10973-018-7104-3
11. Hu Sun, Junjie Yu, Guanghui Li, etc., Co-volatilizing-water leaching process for efficient utilization of rhenium-bearing molybdenite concentrate. //Hydrometallurgy. -Vol. 192. -March 2020.-105284. https://doi.org/10.1016/j.hydromet.2020.105284
12. Doheim, M.A., Abdel-Wahab, M.Z. &Rassoul, S.A. Fluidized bed roasting of molybdenite-effect of operating variables. //Metall Mater TransB.-7.-477–483(1976). https://doi.org/10.1007/BF02652719
13. 13-8. Hu Sun, Guanghui Li, Junjie Yu, etc. A novel simultaneous oxidizing-volatilizing process for efficient separation of pure MoO3 from structure self-sustained molybdenite concentrate pellets.//Powder Technology.-Vol.345. -1 March 2019. -P. 338-345. https://doi.org/10.1016/j.powtec.2019.01.021
14. Guro V.P., Safarov Y.T., Rakhmatkarieva F.G. Selection of the optimal binder for molybdenite concentrate granulation.//Non-ferrous metals. -2016. -No2. –Pp. 68-73, http://DOI:10.17580/tsm.2016.02.11 (in Russian)
15. Adinaev Kh.F., Safarov E.T., Rasulova S.N., Ibragimova M.A., Nabieva Z.A., Pardaev O.T. Modification of charge for granulation of molybdenite concentrate.//Uzb. chem. jurn -2022. -No6. - P.63-68. (in Russian)
To cite this article: H. F. Adinaev, E. T. Safarov, V. P. Guro, S. N. Rasulova, G. M. Parmonov, Z. B. Rakhimjonov. Retention of rhenium during the roasting of molybdenite concentrate in fluidized bed furnace // Uzbek chemical journal. -2023. – Nr2. - Pp.44-49.
Received: 08.04.2023; Accepted: 08.05.2023; Published: 26.05.2023
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UDK 66.074.51.069.833
A. M. Khurmamatov, A. U. Auesbaev
THE EFFECT OF TEMPERATURE ON THE REGENERATION OF A SATURATED ABSORBENT IN A HIGH-EFFICIENCY COMBINED COLUMN
Institute of General and Inorganic Chemistry, Academy of Sciences of the Republic of Uzbekistan
Abstract. Background. Improvement of amine purification of natural gas from H2S and CO2 is important for the oil and gas industry.
Purpose. To study the problems of the existing desorber and its modernization, as well as the parameters of regeneration.
Methodology. The dimensions of the experimental setup are determined based on the principle of geometric similarity in relation to the dimensions of an industrial regeneration column, on a scale of 1:10, and the physical similarity of gas and liquid flow rates.
Originality. For the first time, the desorber was modernized in the distribution zone of a saturated amine solution using a Raschig packing and its efficiency was increased, and the optimal modes of the modernized column were found.
Findings. As a result of the modernization, a carbon dioxide content of 0.22 wt. %, in regenerated amine solution at 131ºC. Due to the nozzle in the distribution zone of the saturated solution, the formation of the gas-liquid layer decreased. The modernization of the apparatus affected the increase in the recovery factor up to 3%.
Key words: desorber, modernization, saturated solution, carbon dioxide, packing, Rashig.
Highlights:
- the existing apparatus for gas purification from hydrogen sulfide requires modernization;
- a modernized apparatus is proposed;
- comparative analysis of various parameters of the two devices.
References
1. Eimer D.A.Gas Treating: Absorption Theory and Practice.- JohnWiley&SonsLtd.-2014.
2. Laptev A.G., Krylova A.N. Energy saving when dividing the inclusion of various using new contact devices // "Improving the efficiency of power equipment - 2012": Sat. tr. VII annual international scientific and practical conference. -Saint Petersburg. -2012. –P. 726-736. (in Russian)
3. Farakhov M.I., Laptev A.G. Highly efficient devices for water and gas cleaning in the industry // Advanced technologies and development prospects of OJSC Kazanorgsintez: abstracts of reports of the international. Anniversary beginning-practical. conf. –Kazan. -2008. -P.86-89. (in Russian)
4. Kapustin V.M. Modernization of oil refining and petrochemistry in Russia // Chemistry. -2013. -No. 4. -P. 12.
5. Kulov N.N., Gordeev L.S. Mathematical modeling in chemical engineering and biotechnology // Theor. Found. Chem. Eng. -2014. -V. 48. -No 3. -P. 225. (in Russian)
6. Dyakonov G.S., Dyakonov S.G., Elizarov V.V., Elizarov D.V. Prototyping of industrial apparatuses for the separation of substances // Teoret. Fundamentals of chem. technologies. -2014. -T. 48. -No. 3. -P. 249. (in Russian)
7. Laptev A.G., Mineev N.G., Malkovsky P.A. Design and modernization of separation apparatuses in oil and gas processing. -Kazan: Printing House, 2002. -P. 250. (in Russian)
8. Yasaveev Kh.N., Laptev A.G., Farakhov M.I. Modernization of installations for the processing of hydrocarbon mixtures. -Kazan: Kazan.state. energy Univ., 2004.-p. 307. (in Russian)
9. Khurmamatov A.M., Auesbaev A.U. Determination of the density of amine solvents for the removal of acid gases // Uzbek chemical journal. -2022. -No. 3. –P. 74-80. (in Russian)
10. Auesbaev A.U., Khurmamatov A.M., Ismailov O.Yu. Calculation results of thermophysical properties of n-methyldiethanolamine depending on temperature // Universum: technical sciences: electron.sci. magazine -2022. 12(105). URL: https://7universum.com/en/tech/archive/item/14712. (in Russian)
11. Khurmamatov A.M., Auesbaev A.U., Ismailov O.Y. Effect of temperature on the physico-chemical properties of n-methyldiethanolamine // PPOR. -Vol. 24.-No.1.-2023.-Рp. 99-107.
12. Auesbaev A.U. Method determination carbon dioxide content in saturated and regenerated amine solution. // XII International Scientific and Practical Conference «Actual issues of the development of science and ensuring the quality of education». -Florence, Italy. -2023. -March 28-31. -344-345. Doi:10.46299/ISG.2023.1.12
13. B. A. Sokol, A. K. Chernichev, and D. A. Baranov, Mass Transfer Column Packings. 358p.
14. Laptev A.G., Farakhov M.I., Mineev N.G. Fundamentals of calculation and modernization of heat and mass transfer plants in petrochemistry. - Kazan: Publishing house. Kazan. state energ. Univ., 2010. -P. 574.
To cite this article: A.M. Khurmamatov, A. U. Auesbaev. The effect of temperature on the regeneration of a saturated absorbent in a high-efficiency combined column // Uzbek chemical journal. -2023. – Nr2. - Pp.49-56.
Received: 07.04.2023; Accepted: 17.05.2023; Published: 26.05.2023
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UDK 665.5:547.32
S. Kh. Ganieva, A. A. Aliev, B. Z. Adizov, B. A. Smanov, Sh. M. Saydakhmedov
REGENERATION OF USED ENGINE OIL ON VARIOUS ADSORBENTS
Institute of General and Inorganic Chemistry, Academy of Sciences of the Republic of Uzbekistan e-mail: khimiyanefti@mail.ru
Abstract. Background. Ensuring the collection of used lubricants and their recycling in order to restore their original properties is relevant.
Purpose. Regeneration of used motor oils by means of various local mineral adsorbents, determination of their physical and chemical properties.
Methodology. IR spectra were recorded on a UR-20 spectrophotometer, the comparative physicochemical parameters of engine oil were measured before and after regeneration in accordance with State’s Standard 8581, and the degree of regeneration was determined (in comparison with the original oil) using a DN-300M microscope.
Originality. Selection of the optimal natural adsorbent and conditions for regeneration of motor oil with the restoration of its properties appropriate for new exploitation.
Findings. In case of opoka-like Kermine clays are applied as adsorbent for cleaning M10G2k oil its physical-chemical properties are better in compare with Navbakhor bentonite application. The degree of its purification depends on the composition and structure of adsorbents, methods of their thermal and chemical activation.
Key words: waste oil, adsorbent, ecology, regeneration, bentonite.
Highlights:
- comparative analysis of compositions of samples of natural adsorbents;
- comparative indicators of used oil before and after regeneration with adsorbents;
- method of spectral (IR) analysis and microphotography.
References
1. Evdokimov A.Yu., Fuks I.G., Shabalina T.N., Bagdasarov L.N. Lubricants and problems of ecology. - Moscow State Unitary Enterprise: Izd. "Oil and Gas", 2000. -423p. (in Russian)
2. B.S. Beloselsky. Technology of fuel and power oils.-M.: MEI Publishing House, 2003.-340p. (in Russian)
3. Murodov M.N., Narmetova G.R. Adsorbents based on local mineral sorbents for purification of petroleum oils// Uzbek chemical journal.-2004.-No4.-p. 38-40. (in Russian)
4. Chernozhukov N.I. Purification and separation of petroleum feedstock, production of commercial petroleum products.-M.: Chemistry Publishing House, 1978.-424 p. (in Russian)
5. Safieva R.Z. Physical chemistry of oil. Physical and chemical bases of oil refining technology.-M.: Chemistry, 1998.-448 p. (in Russian)
6. William L. Lefler. Oil processing.-M., 2003.-224 p. (in Russian)
7. Dubrovin E. The impact of industrial enterprises on the environment. – M.: Nauka, 1998, 320 p. (in Russian)
8. Mirzaev A.U., Chinikulov H. New deposit of bentonite clays of the Navbakhor deposit.// J. Geology and mineral resources.-1999.-No5.-P. 23-30. (in Russian)
9. Abdukarimov R.S. Development of import-substituting technology for adsorption post-treatment of jet fuel: Diss...cand.tech. sciences.-Tashkent, IGIC AS RUz, 2008.-62p. (in Russian)
10. Narmetova G.R., Saidakhmedov A.I., Mirzaeva M.M. Study of aromatic hydrocarbons of phenolic extracts from oil purification using adsorbents // Uzbek Journal of Oil and Gas.- 2017.- No. 1.- P.52-56. (in Russian)
11. Ganieva S.Kh., Khamidov B.N., Smanov B.A. Restoration of waste petroleum oils for use as a dispersion medium in gear lubricants // Uzbek Journal of Oil and Gas.-2022.-No. 2.- P.77-82. (in Russian)
12. Ganieva S.Kh., Khamidov B.N. Recovery of waste petroleum oils by local adsorbents // All-Russian scientific and educational conference "Modern technologies in the field of environmental protection and technosphere safety": Abstracts of reports.-Russia.-P. 156-159. (in Russian)
13. Ganieva S.Kh., Smanov B.A., Adizov B.Z. Ecological aspects of cleaning and improving the quality of used motor oils using various adsorbents.// Mater. Intern.scientific-pract. conf. "Modern achievements in biomedicine and ecology" - Almaty. 2023.-p.233-237. (in Russian)
14. Khamidov B.N., Ganieva S.Kh., Smanov B.A., Mirzaeva M.M. Investigation of the adhesive properties of the resulting modified gear lubricants based on used oils. // Scientific and technical journal FerPI. – Fergana.-2023. -№2.-Volume 27. -P. 239-242. (in Russian)
To cite this article: S. Kh. Ganieva, A. A. Aliev, B. Z. Adizov, B. A. Smanov, Sh. M. Saydakhmedov. Regeneration of used engine oil on various adsorbents // Uzbek chemical journal. -2023. – Nr2. - Pp.56-62.
Received: 15.05.2023; Accepted: 26.05.2023; Published: 26.05.2023
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UDC 66.045.5
A.M. Khurmamatov, O. YU. Ismailov, J. A. Muminov
WAYS TO IMPROVE THE EFFICIENCY OF THE AIR COOLING PROCESS OF THE HYDROCARBON FRACTION
Institute of General and Inorganic Chemistry of the ASRUz, Tashkent. Jaloliddinmuminov3110@gmail.com
Abstract. Background. The disadvantage of air coolers is their low efficiency. For them, the use of the "air-fog" system is an urgent task.
Purpose. Search for ways to improve the efficiency of the air cooling process by changing the thermophysical properties of air.
Methodology. A hydrocarbon vapor cooling unit was used, equipped with control and measuring devices, measurements of the technological parameters of fuel storage were carried out, according to State’s standards 51364-99; 30872-2002, ISO 13706-2011. The data was processed statistically.
Originality. It has been found that the use of moist air in air cooling is more efficient and has advantages in cases of high volume flow rates.
Findings. It is noted that the use of moist air is 9-13% more efficient than dry air when the volume flow rate of the cooled oil product in the experimental installation changes within 3-11 l/min.
Key words: сooling efficiency, dry air, moist air, volume flow, heat capacity, amount of heat.
Highlights:
- the growth of air humidity increases its thermophysical properties;
- cooling efficiency with moist air;
- use of moist air for cooling in hot weather.
References
1. Z. Salimov. Oil and gas processing processes and equipment. - T.: Alokachi, 2010. - 508 p. (in Uzbek)
2. Skoblo A.I., Molokanov Yu.K., Vladimirov A.I., Shchelkunov V.A. Processes and apparatuses of oil and gas processing and petrochemistry. - M.: Nedra, 2000. - 677 p. (in Russian)
3. Kryukov N.P. Air coolers.-M.: Chemistry, -1983. 168p. (in Russian)
4. Vladimirov A.I., Shchelkunov V.A., Kruglov S.A. The main processes and apparatus of oil and gas processing (quick reference). - M.: Oil and gas, 1996. - 155 p. Ç Yunus. Heat and Mass Transfer: A Practical Approach, Third Edition, McGraw-Hill.- New York, 2007. (in Russian)
5. N.R. Yusupbekov, H.S. Nurmuhamedov, S.G. Zakirov. "Chemical technology main processes and devices".-Tashkent,-2015.-838 p. (in Uzbek)
6. Fundamentals of calculation and design of air-cooled heat exchangers: a reference book under the general. ed. V. B. Kuntysh, A. N. Bessonny. St. Petersburg: Nedra, 1996.-512 p. (in Russian)
7. Xurmamatov, A.M.,&Mo‘Minov, J.A. (2021). Research results of air cooling of gasoline fraction. Oriental renaissance: Innovative, educational, natural and social sciences, 1 (9), 619-624. (in Uzbek)
8. Examples of calculations of non-standardized effective heat exchangers / V. B. Kuntysh [et al.].-St. Petersburg: Nedra, 2000.-300 p (in Russian)
9. Mo’minov J.A., Xurmamatov A.M. Influence of external factors in air cooling of oil products. // Innovations in the oil and gas industry, modern power engineering and actual problem. –Toshkent.-2021. –С 91-93. (in Uzbek)
10. Kuntysh B.V. Basic ways to improve air cooling devices / B.V. Kuntysh, A.N. Sleepless, A.A. Bril // Chemical and petrochemical engineering. - 1997. - No. 4. - Pp. 41-44. (in Russian)
11. Muminov, J. A. "Key Performance Indicators for Air Cooled Hydrocarbon Crude Oil." Innovative technologies in ensuring the quality and safety of chemical and food products (2021): P.314-315. (in Uzbek)
12. Chitrov E.V. Improving the efficiency and reliability of air coolers for the petrochemical industry / E.V. Chitrov, V.Z. Kanter, S.B. Pokhodyaev, Yu.I. Anoshkin // World of Oil Products. - 2007. - No. 2. - Pp. 22–25. (in Russian)
To cite this article: A.M. Khurmamatov, O. YU. Ismailov, J. A. Muminov. Ways to improve the efficiency of the air cooling process of the hydrocarbon fraction // Uzbek chemical journal. -2023. – Nr2. - Pp.62-69.
Received: 28.04.2023; Accepted: 24.05.2023; Published: 26.05.2023
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UDK 631.859:631.81
1O.V. Myachina, 1R. N. Kim, 1L. E. Mamasalieva, 2B. O. Numonov, 1B. A. Pulatov, 1O. S. Narzullaev, 1A. X. Rakhmonov, 1G. A. Axmatdjanova
INFLUENCE OF A CONCENTRATED ONE-SIDED PHOSPHORUS FERTILIZER-PRECIPITATE ON THE GROWTH AND DEVELOPMENT OF COTTON
1IGIC AS RUz,, Tashkent, Uzbekistan. E-mail: myachinaov@mail.ru, 2Kokand state pedagogical institute, Kokand city, Uzbekistan E-mail: kimyogar1985@mail.ru
Abstract. Background. Among the tasks set for agriculture is the development of new phosphorus fertilizers with increased bioenergetic efficiency, necessary for the development of cotton.
Purpose: based on vegetation experiments, to compare the dynamics of cotton growth under the influence of traditional and new concentrated phosphate fertilizers, to identify the effectiveness of their use.
Methodology. Agrotechnical studies were carried out according to the methodology of the Scientific Research Institute of the USSR Ministry of Agriculture of the Republic of Uzbekistan in a comparative vegetative experiment.
Originality. In view of the lack of knowledge of the object of study on neutral and slightly alkaline soils, a new approach to characterizing the effectiveness of fertilizers is proposed.
Findings. Phenological observations indicate a positive effect of the test fertilizer on plant nutrition, the formation of vegetative and reproductive organs, in comparison with the control variant, on the quality and quantitative characteristics of the raw cotton crop.
Key words: agrochemistry, vegetation, phosphate fertilizer, precipitate, composition, phenology, yield.
Highlights:
- a positive effect of the precipitate on the growth of cotton, on the root system was found.
- revealed an increase in the yield of raw cotton, compared with the control variant, by 6.98%.
References
1. Abidova M.A., Ubaidullaeva S.B., Botirov Z.U. Types of phosphate fertilizers and their production // Scientific Journal. -V. 2. ISSUE 6 ISSN 2181-1784 SJIF. -2022: 5.947 (in Russian)
2. Allamuratova A.Zh., Erkaev A.U., Reimov A.M. X-ray studies of the phase composition of phosphorus-containing fertilizers from the nitric acid extract of phosphorites of the Central Kyzylkum // Kimyo. - 2016. - No. 3. - S. 9-11. (in Russian)
3. Giyasidinov A.L., Sultonov B.E., Namazov Sh.S., Mukhamedova B.I. Obtaining single fertilizers based on phosphorite flour from phosphorites of the Central Kyzylkum and nitric acid // Composite materials. -2019. - No. 3. - S. 34-37. (in Russian)
4. Ubaydullayeva, S. B. Q. Determination of the composition of the complex using the isomolar series method. //Oriental renaissance: Innovative, educational, natural and social sciences. -2022. -2(5). -578-582. (in Uzbek)
5. Ortikova, S. S., Badalova, O. A., Alimov, U. K., Namazov Sh., Seitnazarov A. R. (2016). Study of the physico-chemical properties of concentrated fertilizer-ammophosphate from off-balance phosphorite ore of the Central Kyzylkum //Modern scientific research and development.-(5) -75-77. (in Russian)
6. Kodirova, D. T., & Abidova, M. A. Study of the magnesium chlorate-triethanolammonium phosphate-water system. // Universum: technical sciences. -2019. -(11-2 (68). -23-27. (in Russian)
7. Sodiqovna, O. M., & Alisherovna, A. M. Classification Of Inorganic Substances and Their Types. //Texas Journal of Multidisciplinary Studies -2021. -2. -231-234.
8. Methods of field and vegetative experiments with cotton. -Tashkent, SoyuzNIHI.
9. Methods of agrochemical analyzes of soils and plants of Central Asia - Tashkent: SoyuzNIKhI, 1977 p.
To cite this article: O.V. Myachina, R. N. Kim, L. E. Mamasalieva, B. O. Numonov, B. A. Pulatov, O. S. Narzullaev, A. X. Rakhmonov, G. A. Axmatdjanova. Influence of a concentrated one-sided phosphorus fertilizer-precipitate on the growth and development of cotton // Uzbek chemical journal. -2023. – Nr2. - Pp.68-73.
Received: 12.05.2023; Accepted: 25.05.2023; Published: 26.05.2023
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UDK 631.81+579.266
O.V. Myachina, L. E. Mamasalieva, R. N. Kim, A. X. Rakhmonov, O. S. Narzullaev, B. A. Pulatov, G.Y. Isaev
CORRELATION BETWEEN SOIL MICROBIAL COMMUNITY COMPOSITION AND LEVEL OF SOIL ORGANIC MATTER
Institute of General and Inorganic Chemistry of the AS RUz
Abstract. Background. A comprehensive study of structure and functional activity of microbial soil complexes is necessary to determine the contribution of the hydrolytic community to the biological activity and transformation of organic matter. Purpose: To determine the effect of humic nitrogen and phosphorus fertilizers on soil biocenosis, the composition of the hydrolytic community was used, which potentially determines the direction of humus synthesis or decomposition processes.
Methodology. Determination of number of microorganisms and composition of microbial communities in agrocenoses was carried out according to Zvyagintsev (1991), Tepper et al. (1987).
Originality. The seasonal dynamics of soil bacilli, actinomycetes, microscopic fungi, and their proportion under humic nitrogen and phosphorus fertilizers impact has been established. The introduction of humic fertilizers reduced the number of hydrolytic microorganisms and leveled their destructive effect on soil organic matter.
Findings. Тhe absolute and relative abundance of hydrolytics microorganisms, which are representatives of various ecological, trophic and taxonomic groups are shown. There were revealed correlations between the number of microorganisms and soil organic matter when using organomineral fertilizers containing products of brown coal processing.
Key words: humic fertilizers, typical gray soil, bacilli, actinomycetes, micromycetes, humus, correlation.
Highlights:
- number and ratio of microorganisms - destructors;
- correlation of the number and proportion of micromycetes with the content of humus;
- relationship between the number of ammonifiers and humus; bacilli and humus.
References
1. Solovieva E.S. Ecological features of actinomycete complexes of urban soils.// Diss... cand. biol. Sciences. - Perm, 2015. -147 p. (in Russian)
2. Manucharova N.A. Hydrolytic prokaryotic complexes of terrestrial ecosystems. — Moscow: Universitetskaya kniga, 2014. — 272 p. (in Russian)
3. Manucharova N.A. Molecular biological methods in soil science and ecology. Tutorial. — Moscow: Universitetskaya kniga, 2014. — 68 p. (in Russian)
4. Haki G. D. and Rakshit S. K. Developments in industrially important thermostable enzymes: a review // Bioresourse Technology.-2003.-89(1): 17-34.
5. Zenova G.M., Zvyagintsev D.G. Diversity of actinomycetes in terrestrial ecosystems.-M.: Moscow Publishing House. un-ta, 2002.-130 p. (in Russian)
6. Semenov V.M., Kogut B.M. Soil organic matter. – M.: GEOS, 2015.-233 p. (in Russian)
7. Mishustin, E. N. Associations of soil microorganisms / E. N. Mishustin. - M .: Publishing house Nauka, 1975. - 106 p. (in Russian)
8. Workshop on agricultural chemistry: Proc. allowance. - 2nd ed., revised. and additional / Ed. Academician of the Russian Academy of Agricultural Sciences V.G. Mineev. - M.: Publishing House of Moscow State University, 2001.-689 p. (in Russian)
9. Tepper E.E., Shilnikova V.P., Pereverzeva G.I. Workshop on microbiology. -M.: Agropromizdat, 1987.-239 p. (in Russian)
10. Zvyagintsev D.G. (ed.) Methods of soil microbiology and biochemistry. Textbook.- Ed. Moscow State University, 1991.-304 p. (in Russian)
11. Williamson, N., Brian, P., and Wellington, E. M.: Molecular detection of bacterial and streptomycete chitinase in the environment // Antonie Vanleuwenhoek. 2000. 78: 315-321
12. Terahara T., Ikeda S., Noritake C., Minamisawa K., Ando K., Tsuneda S., Harayama S. J. Molecular diversity of bacterial chitinases in arable soils and the effects of environmental factors on the chitinolytic bacterial community// Soil Biology and Biochemistry 41(3):473-480. 2009. http://DOI:10.1016/j.soilbio.2008.11.024
13. Zenova G.M., Dubrova M.S., Kuznetsova A.I., Gracheva T.A., Manucharova N.A., Zvyagintsev D.G. Ecological and Taxonomic Features of Actinomycetal Complexes in Soils of the Lake Elton Basin //Eurasian Soil Science, 317 V. 49, 2016 № 2, p. 213-216
14. Cloutier, M.; Murrell, E.; Barbercheck, M.; Kaye, J.; Finney, D.; García González, I.; Bruns, M. Fungal Community Shifts in Soils with Varied Cover Crop Treatments and Edaphic Properties. // Sci. Rep. 2020, 10, 6198
15. Kodadinne Narayana, N.; Kingery, W.L.; Shankle, M.W.; Ganapathi Shanmugam, S. Differential Response of Soil Microbial Diversity and Community Composition Influenced by Cover Crops and Fertilizer Treatments in a Dryland Soybean Production System. //Agronomy 2022, 12, 18. https://doi.org/10.3390/agronomy12030618
16. Francioli, D.; Schulz, E.; Lentendu, G.; Wubet, T.; Buscot, F.; Reitz, T. Mineral vs. Organic Amendments: Microbial Community Structure, Activity and Abundance of Agriculturally Relevant Microbes Are Driven by Long-Term Fertilization Strategies. // Front. Microbiol. 2016, 7, 1446.
17. O. V. Kutovaya, A. M. Grebennikov, A. K. Tkhakakhova, V. A. Isaev, V. M. Garmashov, V. A. Bespalov, Yu. Changes in soil biological processes and the structure of the microbial community of agrochernozems under different methods of tillage // Bul. Soil in-ta im. V.V. Dokuchaev. 2018. Issue. 92. S. 35-61. DOI:10.19047/0136-1694-2018-92-35-61 (in Russian)
To cite this article: O.V. Myachina, L. E. Mamasalieva, R. N. Kim, A. X. Rakhmonov, O. S. Narzullaev, B. A. Pulatov, G.Y. Isaev. Correlation between soil microbial community composition and level of soil organic matter // Uzbek chemical journal. -2023. – Nr2. - Pp.73-81.
Received: 19.05.2023; Accepted: 25.05.2023; Published: 26.05.2023
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