Uzbek Chemical Journal

VOLUME NR5

PHYSICAL CHEMISTRY

 

UDC 543.872

S. N. Rasulova, V. P. Guro, E. T. Safarov, M. F. Paygamova

KINETICS OF COMPARATIVE REAGENT LEACHING OF Mo-CALCINE AND Mo-CONCENTRATE

Institute of General and Inorganic Chemistry, Academy of Sciences of the Republic of Uzbekistan

Abstract. Background. The sulfide phase of ore minerals is susceptible to passivation. Overcoming it is achieved: by oxidative burning. in an autoclave. by hydrometallurgical methods. Firing is used in the processing of Mo-concentrates (MoC) - in a drum furnace. followed by ammonia leaching. Technologies are proposed: fluidized bed furnace (FB). replacement of binder kaolin with organic substances. An alternative to firing is hydrometallurgy.

Purpose to compare the effectiveness of processing methods of MoC - firing-ammonia with reagent - in nitric acid and hypochlorite solutions.

Methodology. Samples of Mo concentrate (38% Mo in the MoS2 phase) were used. The concentration in metal solutions was determined photocolorimetrically (KFK-2) and spectrometrically (Aligent 7500 IPP MS); Sample microscopy - using electron microscopes: SEM-EDS EVO-MA (Carl Zeiss. Instrum) and JCM – 6000 Neoscope II (Jeol); phase analysis on an XRD Empyrean diffractometer (PANalytical); kinetic measurements on MoK powders, t: w = 1: 7.

Originality. The results of leaching of molybdenite concentrate of JSC Almalyksky MMC are compared according to the schemes: the existing calcining-ammonia and non-calcining with nitric acid. hypochlorite opening and leaching. A full-fledged alternative to hypochlorite leaching of the roasting-ammonia scheme is proved.

Findings. The kinetics of oxidation of a modibdenite concentrate in a hypochlorite electrolyte generated anodically in a 10% NaCl solution was studied. Leaching products are studied by physicochemical methods.

Key words: sulfide minerals. Mo-concentrate. leaching. sodium hypochlorite.

Highlights:

* kinetics of molybdenite oxidation in a hypochlorite electrolyte was studied;

* hypochlorite leaching and firing-ammonia scheme;

* changes in the leachate data are obtained.

References

1. S. Rasulova. V. Guro. M. Ibragimova. Ye. Safarov. Okisleniye i passivatsiya sul'fidnykh rud v gidrometallurgii zolota i molibdena / Konferentsiya: Metall-2018. 27-ya Mezhdunarodnaya konferentsiya po metallurgii i materialam. 23-25 maya 2018 goda. Brno. Respublika Chekhiya. YES. S. 1442-1447.

2. Rasulova S.N .. Guro V.P .. Ibragimova M.A .. Safarov Ye.T. Okisleniye i passivatsiya poverkhnosti sul'fidnykh rud // Uzb khim. zh. 2018. - No1. S. 15-21.

3. Eskandar Keshavarz Alamdari. Selektivnoye vyshchelachivaniye-izvlecheniye Re i Mo iz otkhodyashchey gazovoy pyli pechi obzhiga molibdenita. Indiyskiy institut metallov - IIM 2016. DOI 10.1007 / s12666-016-1021-6 

4. Guankhuey Li. Zhixiong Vy. Khu San i dr. Otdeleniye reniya ot obogashchennogo svintsom kontsentrata molibdenita putem vyshchelachivaniya solyanoy kislotoy s posleduyushchim okislitel'nym obzhigom. Metally 2016. 6. 282; DOI: 10,3390 / met6110282. Publ. 16 noyabrya 2016 g.

5. Li G., Sun' R., Pen Z., Chzhou L., Chzhan YA. (2016) Uletuchivaniye reniya iz kontsentrata molibdenita putem okislitel'nogo obzhiga. V: Hwang JY. i drugiye. (red.) 7-y Mezhdunarodnyy simpozium po vysokotemperaturnoy metallurgicheskoy obrabotke. Springer. Cham. DOI https://doi.org/10.1007/978-3-319-48093-0_12

6. K. M. Smirnov. N. A. Raspopov. Ya. M. Shneyerson i dr. Avtoklavnoye vyshchelachivaniye kontsentratov molibdenita s kataliticheskimi dobavkami azotnoy kisloty: Rossiyskaya metallurgiya (metally). 2010. No 4. S. 11–19. DOI: 10.1134 / S0036029510070025.

7. Patent RF No 2087568 - Sposob izvlecheniya blagorodnykh metallov iz rud i materialov. Gurov V.A .; Zayav .: 1996-07-09; publ. 20.08.1997.

8. Patent RF № 2120487. Sposob pererabotki zolotosoderzhashchego syr'ya. Mel'nichenko Ye.I .. Moiseyenko V.G. Zayavl .: 1997-12-23; opubl. 20.10.1998.

9. Patent RF № 2090637. Sposob izvlecheniya blagorodnykh metallov iz rud. Gurov V.A .; Prior .: zayav .: 1996-07-09; publ. patenta: 20.09.1997.

10. Zharkenov M.I .. Toktamysov M.T .. Satybaldin O.B. Effektivnost' vyshchelachivaniya otval'nykh i bednykh rud tsvetnykh i chornykh metallov Kazakhstana. Almaty: KazGOSINTI. 1993. -S. 150.

11. Patent RF No 2117709. Sposob okislitel'nogo avtoklavnogo vyshchelachivaniya polimetallicheskikh ferrosul'fidnykh materialov. takimi dragotsennymi metally. Korsunskiy V.I .. Timoshenko E.M .. Naftal' M.N. i dr. Zayavl. 1997-10-13; opubl .: 20.08.1998.

 

12. Patent RF No 2087568 - Sposob izvlecheniya blagorodnykh metallov iz rud i materialov. Gurov V.A .; Prior: zayav .: 1996-07-09; publ. 20.08.1997.

13. Allabergenov R.D .. Akhmedov R.K. Vozmozhnosti gidrometallurgii dlya pererabotki mednogo sul'fidnogo syr'ya // Uzb. khimich. zh . 2012.-No5.– S.49-51.

14. Lyu Chzhi-syun. In' Chzhou-lan. CHEN I-guan. Sion Li-chzhi. Kinetika vyshchelachivaniya molibdena iz Ni-Mo rudy v rastvore sernoy kisloty s peroksodisul'fatom natriya v kachestve okislitelya. J. Cent. Yuzhnyy universitet (2015) 22: 874-879. DOI: 10.1007 / s11771-015-2596-5.

15. Potashnikov YU.M .. Lutsik V.I .. Lutsik V.A. Povedeniye pirita v ras-tvorakh gipokhlorita natriya // Izv. vuzov. Tsv. Metallurgiya. 1987.-No 3.–S. 45-48.

16. Dar'ya. T .. Okabe. T. KH. Vaseda. U .. Umetsu. Y. (2000). Izvlecheniye molibdena iz sul'fidnogo kontsentrata elektrookisleniyem i osazhdeniyem. Shigen k Sozai. (2000). T. 116 (3). Pp. 203-210. DOI: 10,2473 / shigentosozai.116.203.

17. TSAO Chzhan Fan. Chzhun Khun JIANG Tao i dr. Otdeleniye reniya ot elektrookislitel'nogo vyshchelachivaniya rastvora molibdenita: J. Cent. Yuzhnyy universitet (2013) 20: 2103-2108 DOI: 10.1007 / s11771-013-1713-6.

18. V. P. Guro. F. M. Yusupov. M. A. Ibragimova i dr. Vybor optimal'nogo vyazhushchego dlya granulirovaniya molibdenitovogo kontsentrata. Tsvetnyye metally (Tsvetnyye metally). 2016. No 2. S. 68—73 DOI: http://dx.doi.org/10.17580/tsm.2016.02.11

19. Safarov O.T .. Sharipov KH.T .. Guro V.P. Granulirovaniye molibdenitovogo uchastka s organicheskim svyazuyushchim. povyshayushcheye vykhod semioksida reniya pri obzhige / Mezhd. n.-pr. konf: «RENIY. VOL'FRAM. MOLIBDEN-2016. OAO INSTITUT «GINTSVETMET». 24-25.03.2016. Moskva. - S.84-88.

To cite this article: S. N. Rasulova, V. P. Guro, E. T. Safarov, M. F. Paygamova. Kinetics of comparative reagent leaching of Mo-calcine and Mo-concentrate // Uzbek chemical journal. -2019. - Nr5. - Pp.3-9.  

Received: 06.03.2019; Accepted: 04.04.2019; Published: 07.10.2019

 

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INORGANIC CHEMISTRY

 

УДК.546.47

L.A.Sharipova

COMPLEX COMPOUNDS OF ZINC NITRATE WITH SOME AMIDES AND BENZOIC ACID

Institute of General and Inorganic Chemistry, Academy of Sciences of the Republic of Uzbekistan

Abstract. Background. In coordination chemistry, metal complexes containing different N, O in the ligand environment are donor centers occupy a special place. They are good models for studying the problem of competitive coordination in chemistry of complex compounds due to the specific action of their environment on the stereochemistry of polyhedra.

Purpose. Determination of synthesis conditions, determination of the composition and structure of coordination compounds of amides and benzoic acid with zinc nitrate. Study of thermal behavior of mixed-ligand zinc nitrate coordination compounds.

Methodology. Differential thermal analysis, X-ray phase analysis, IR spectroscopy, elemental analysis.

Originality. Two new coordination compounds of zinc nitrate with urea, nicotinamide and benzoic acid were synthesized for the first time. Methods of X-ray analysis, IR spectroscopy established the individuality of the synthesized complex compounds, the methods of coordination of ligands and the geometry of the coordination node. The thermal behavior of the synthesized compounds was studied and the thermolysis products were identified.

Findings. The composition of the synthesized compounds is established by the method of elemental analysis. By comparing the interplanar distances and the relative intensities of free molecules of carbamide, nicotinamide, benzoic acids, zinc nitrate hexahydrate, and synthesized coordination compounds, the individuality of compounds of compositions Zn(NO3)2∙CO(NH2)2∙NC5H4CONH2∙2H2О, Zn(NO3)2∙CO(NH2)2∙C6H5COOH∙4H2О. Based on IR spectroscopic data, it was found that the molecules of amide acids are coordinated through an oxygen atom, and nicotinamide is coordinated through a nitrogen atom of the pyridine ring.

Keywords: coordination compounds, composition, synthesis, methods of analysis, X-ray phase analysis, thermolysis, IR spectroscopy.

Highlights:

* complex compounds of zinc nitrate obtained by mechanochemical method

* individuality of synthesized complexes is proved by X-ray method;

* coordination centers proved by IR spectroscopy data;

* derivatographic analysis studied the thermal behavior of complex compounds.

References

1. Ibragimova M.R., Abdullayeva F.A., Khasanov SH.B., Azizov T.A. Kislotno-amidnyye koordinatsionnyye soyedineniya nikotinata magniya // Zhurnal khimicheskoy tekhnologii i metallurgii. - Sofiya, 2016, vyp. 51, No1. – S. 47-52.

2. Khasanov SH.B. Raznoligandnyye koordinatsionnyye soyedineniya stearatov kobal'ta (II), nikelya (II) i medi (II). Dis .... kand.khim.nauk. Tashkent: NUUz, 2011. -124 s.

3. Ibragimova M. R. Koordinatsiya soyedineniy nikotinata nikelya s nekotorymi kislotnymi amidami // American Chemical Science Journal. -2016. -14 (2). -P. 1-7.

4. Ibodulloyeva M.I., Azizov T.A. O kompleksnom soyedinenii nikotinata tsinka s karbamidom // Aktual'nyye problemy sovremennoy nauki. -M. -2011.-No2 (58) .- S.172-173.

5. Ibragimova M.R. Sintez i issledovaniye raznoamidnykh koordinatsionnykh soyedineniy mnikotinatov ryada metallov. Dis .... PhD (khimiya). Tashkent: NUUz, 2018. - 118 s.

6. Azizov O.T. Kompleksnyye soyedineniya pal'mitatov, oleatov, stearatov ryada 3d-metallov s opredelennymi amidami: Dissertatsiya kand. khim. nauk.- Tashkent: 2006. - 168 s.

7. Kholmatov D.S. koordinatsionnyye soyedineniya pal'mitata, oleata i stearata magniya s amidami Dis .... kandidat nauk (kimo), -Bukhoro, 2019.-120 s.

8. Yegorov-Tismenko YU.K. Kristallografiya i kristallokhimiya.-Moskva, 2005. -589s.

9. Yakimov I.S., Dubinin P.S. Kolichestvennyy rengenofazovyy analiz .–  IPK SFU, 2008. - 25 s.

10. Kuz'micheva G.M. Poroshkovaya difraktometriya v materialayedenii. –M: MITKHT im. M.V.Lomonosova, 2005.-CH.1. -90 s.

11. Gabbot P. (red.) Printsipy i primeneniye termicheskogo analiza. - Singapur: Wiley - Bleckwell, 2008. - 480 s.

12. Paulik F., Paulik Dzh., Erdey L. Derivatograf. I Mittelung Ein Avtomatizirovannyy registrator Apparat Zur Gleichzeitigen Ausguchrund der Differentsial'no-termogravimetricheskiy Untersuchungen. // Z.Anal.Chem.1958. V.160, No4, -P.241-250.

To cite this article: L.A.Sharipova. Complex compounds of zinc nitrate with some amides and benzoic acid // Uzbek chemical journal. -2019. - Nr5. - Pp.10-15. 

Received: 18.07.2019; Accepted: 23.08.2019; Published: 07.10.2019

 

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UDK 541.123.6

L. Soliev, M. B. Usmonov, M. T. Jumaev, P. A. Mukhtorov

SOLUBILITY DETERMINATION IN THE SYSTEM OF Na,Са//SO4,F-H2O AT 50°С

Tadjik state university, Dushanbe c., Rudaki 121. E-mail: soliev.lutfullo@yandex.com , usmonov.86@mail.ru, jumaev_m@bk.ru

Abstract. Background. The problem of utilization of liquid wastes from industrial aluminum production is one of the most important both in terms of increasing the productivity of the process and solving environmental problems.

Purpose. Solubility determination in the system of Na,Са//SO4,F-H2O at 50°С constructed its state diagrams with subsequent recommendations of the obtained data when developing optimal conditions for utilization of liquid wastes of industrial aluminum production.

Methodology. Concentration parameters of crystallization of individual equilibrium solid phases and their combination on geometrical images of the studied system with the subsequent constructed its solubility diagrams were determined.

Originality. The equilibrium concentrations of the liquid phase were determined during the crystallization of individual solid phases in the fields, their joint crystallization at curves and points. For the main data obtained for the first time, a solubility diagram of the studied system was constructed at 50°C.

Findings. Solubility on geometric images of the Na,Ca//SO4,F-H2O system at 50°C, changes in the data obtained relative to the isotherms 0 and 25°C. In particular, the increase in the solubility of Na2SO4 with 4.76 and 21.71 wt. % at 0 and 25°C, respectively, up to 31.73 wt. % at 50°C; NaF with 3.57 and 3.77 wt. % at 0 and 25°C, respectively, to 3.97 wt. % at 50°C; CaF2 with 0.190 and 0.230 wt. % at 0 and 25°C, respectively, to 0.340 wt. % at 50°C. Micrographs of individual and jointly crystallized equilibrium solid phases were obtained.

Key words: system, solubility, equilibrium, diagram, liquid phase, solid phase, crystallization, nonvariant point, geometric images, microphotographs, temperature.

Highlights:

* solubility diagram at 50°C represented in the full version in water and salt parts.

* pictures of solid phases for both separate and joint crystallization.

* contours of a separate and joint crystallization of the equilibrium phases.

References

1. Morozova V.A., Rzhechitskiy E.P. // Zhurn. neorg. khimii, 1977. -T.22. -No3. -S. 873.

2. Rzhechitskiy E.P., Kondrat'yev V.V., Tenigin A.YU., Afanas'yev A.D//Izvestiya vuzov.Prikladnaya khimiya i biotekhnologiya, 2013. -No 2 (5).-S.36-43

3. SoliyevL., UsmonovM. / Fazovyye ravnovesiya sistemy Na,Ca||SO4,F-H2O pri 250S//Dokl.ANRespublikiTadzhikistan. 2010. -T.53. -No8. -S.612.

4. Soliyev L., Usmonov M./ Fazovyye ravnovesiya sistemy Na,Ca||SO4,F-H2O pri 00S //Dokl.AN Respubliki Tadzhikistan.2011. -T.54. -No9. -S.754-758.

5. Usmonov M., Soliev L., V. Nuri. //Solubilities in the Na,Ca||SO4,F–H2O System at 0°C. Russian Journal of Inorganic Chemistry, 2013. -Vol. 58. -No.12. -P. 1567–1570.

6. UsmonovM.,SolievL.Solubilities in the Na,Ca||SO4,F–H2O System at 25°C. Russian Journal of Inorganic Chemistry, 2014, Vol. 59, No. 12, pp. 1505–1509.

7. Spravochnik eksperimental'nykh dannykh po rastvorimosti mnogokomponentnykh vodno – solevykh sistem.t. 1., kn. 1 -2. SPb.: Khimizdat, 2003g. -1151s.

8. Spravochnik eksperimental'nykh dannykh po rastvorimosti mnogokomponentnykh vodno – solevykh sistem. T. II., kn. 1 -2. SPb.: Khimizdat, 2004. -1247 s.

9. Zhang X., Ren Y., Li P., Ma H., Ma W., Liu C., Wang Y.N., Kong L., Shen W. //Solid – Liquid Equilibrium for the Ternary systems (Na2SO4+NaH2PO4+H2O) and (Na2SO4+NaCI+H2O) at 313.15 Kand Atmospheric Pressure. J.Chem.Eng.Data -2014. -59 (12). -3969 – 3974.

10. Tursunbadalov S., Soliev L. // Phase equilibria in the quinary Na, K//SO4, CO3, HCO3-H2O system at 75 °C// Journal of Solution Chemistry. 2015. -T. 44. -No 8. -S. 1626-1639.

11. Goroshchenko YA.G., Soliyev L., Gornikov YU.I. //Ukr.khim. Zhurn. 1987. -T.53. -№ 6. -S. 568.

12. Feng-Chen, U. The Key Tehnologiesand Problems of Wastewater Zero Dischargein Coal Chemical Industry. ChemicalIndustry 2013. -31 (2). -18 - 24.

13. TurekM., DydoP., KlimekR.//Saitproductionfromcoal-minebrinenED-evaporation-crustallizationsystem.Desalination -2005. -184 (1-3). -439-446.

14. ZhouH., BaoY., BaiX., MaR., HuangfuL., ZhangC. Salt-forming regions of seawater type solution in the evaporation and fractional crystallization process. FluidPhaseEquilib. -2014. -362 (2). -281 - 287.

15. Garoshchenko YA.G. Masstsentricheskiy metod izobrazheniya mnogokomponentnykh sistem. / Kiyev: «Naukova dumka». -1982. -264 s.

To cite this article: L. Soliev, M. B. Usmonov, M. T. Jumaev, P. A. Mukhtorov. Solubility determination in the system of Na,Са//SO4,F-H2O at 50°С // Uzbek chemical journal. -2019. - Nr5. - Pp.15-21. 

Received: 10.07.2019; Accepted: 20.08.2019; Published: 07.10.2019

 

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UDK. 541.123.3.

M. T. Abdullaeva, A.A. Orazbaeva, B.X. Kucharov, B.S. Zakirov.

INTERACTIONS OF N-ACETYL ETHANOLAMINE WITH AMMONIUM NITRATE AND UREA

Institute of General and Inorganic Chemistry, Academy of Sciences of the Republic of Uzbekistan

Abstract. Background. One of the main directions of increasing crop yields is the provision of agriculture with mineral fertilizers, plant growth stimulants and pesticides.

Рurpose. The aim is to obtain complex new liquid nitrogen fertilizers with physiological activity based on urea, ammonium nitrate, industrial waste, which contains methyl acetate and monoethanolamine.

Methodology To perform the research the following method were used: IR-spectroscopy; viscosity of the solutions via a viscometer of the type VSL, pH – via METTLER TOLEDO FE 20 / FG 2 pH meter, refractive index – via IRF 454 refractometer BM model; solubility and interaction of components – via methods of isomolar series and visual polythermal. The solubility in the NH4NO3 – CH3CONHC2H4OH – H2O system was studied using eight internal sections

Originality. The solubility of ammonium nitrate in the system was studied. N-acetyl ethanolamine is water; it is established that the system is of a simple eutonic type without the formation of new chemical compounds.

Findings. On the basis of polythermal data, a system solubility diagram was constructed from (-56.0°C) to 30.0°C, on which the ice crystallization fields, α-NH4NO3, β-NH4NO3, γ-NH4NO3, CH3CONHC2H4OH, are separated.

Key words: N-acetyl ethanolamine, ammonium nitrate, carbamide, monoethanolamine, physiologically active substance.              

Highlights:

* solubility in a system ammonium nitrate - N-acetyl ethanolamine - water;

* the isomolar series method for carbamide – N-acetyl ethanolamine – water.

References

1. Yankov A.V., Savenkov A.B., Potobenko V.Yu. Uluchsheniye fiziko-mehanicheskih svoystv mineralnih udobreniy// V sb.trudov «Тezisi dokladov   18-Меndeleyvskogo s̉yezda po obshey I prikladnoy himii. – Мoskva: 23-28 syenyabrya, «Granisa», 2007. – Т. 3. – S. 91

2.  Patent Yaponiya  №50-2902. Stimulyatiri rosta rasteniy  / Sigzaki В., Ekiaki  Х // -Оpubl v RJH 1975, 046 П.

3. Patent Yaponiya  №3897241 Ethanolamine organic carboxylic acid composisition for accelerating fruit ripening [Fertilizer Manufacturing Co. –Оpubl v RJH 1976, No 10 (II).

4.  Narhodjaev A.H. Biologicheskiy  aktivniye soedineniya na baze othodov hlopchistitelniyh zavodov I proizvodstva sinteticheskoy pishevoy uksusnoy kisloti//  Meteriali konferensii « Aktualniye problem himii prirodnih soyedinenii» Sbornik teyzisov. – Тashkent, 2009.-S. 243.

5.  Lapa B.B.,  Smolskiy B.G. Vliyaniya jidkih udobreniy na osnove KAS na urojaynost kukuruzi. // Аhova raslin: Dvuhmesyachniy naucno –proizvodstvenniy jurnal. 2002. –No3. –S. 5-6.

6.  Sedlyar F.F. Ammiachnoy selitri I  KAS na urojaynost semyan yarovogo rapsa //Meteriali mejdunarodnoy prakticheskoy konferensii « Priemi povisheniyeya plodorodiya pochv I effektivnosti udobreniy» –Gorki. 2006. – S. 198-200.

7.  Metodi analiza fosfatnogo sirya, fosfornih I kompleksnih udobreniy, kormovih fosfatov. – М.: Himiya, 1975-215 s.

8.  Klimova  V.A. Osnovniye mikrometodi analiza organicheskih soedineniy. – М.: Himiya, 1975.   -224 s.

9.  Trunin A.S., Petrova L.G. Vizualno- politermicheskiy metod/ Dep. VINITI No584-78. Kuybeshev, Kuybeshevskiy politehnicheskiy in-t.-1977.  –94 s.

10.  Abdullaeva M.T., Isabaev Z., Narhodjaev. А.Х., Zakirov B.S.  Metiatsetat  va monoetanolaminning o’zaro ta’sirlashuvi //  O’zbekiston Fanlar Akademiyasi Dokladlar Jurnali  –Тashkent,   2018. -No3. –S. 6-9.

11.  Аnosov V.Ya I dr.  Osnovi  fiziko –himicheskogo analiza .- М.: Nauka, 1976.  – 255 s.

12.  Nakamoto K. IK-spektr i spektri KR  neorganicheskih I koordinasionnih soedineniy. –МIR.: , 1991.-536 s.

13. Vasilyev A.V., Grinenko E.B., SHukin А.О., Fedulina Т.G.  Infrakrasnaya spektroskopiya organicheskiyh I prirodnih soedineniy: uchebnoye posobie. SPb.GLТА, 2007.– 54 s.

14. Bergman A.G., Dzuyev A.D., Karmanov Z.M.  Politerma rastvorimosti troynoy sistemi voda – mochevina –nitrat ammoniya. –Ucheniye zapiski   Kabardino –Balkarskogo Gos Un-ta. – Nalchik, 1966, –S. 45-52.

15. Potexin V.A., Bergman A.G. Politerma plavkosti sistemi nitrat kaliya– mochevina –nitrat ammoniya. // Jurn. neorg. himii.  – Мoskva , 1968, Т.13 – No 12. –S. 3395-3340.

To cite this article: M. T. Abdullaeva, A.A. Orazbaeva, B.X. Kucharov, B.S. Zakirov. Interactions of N-acetyl ethanolamine with ammonium nitrate and urea // Uzbek chemical journal. -2019. - Nr5. - Pp.21-27. 

Received: 02.05.2019; Accepted: 03.06.2019; Published: 07.10.2019

 

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UDK 628.358 (043): 66.067

M. S. Li, G. B. Miradullaeva, U. A. Ziyamukhamedov

DEVELOPMENT AND APPLICATION OF ANTI-CORROSION CRITICALS BASED ON MODIFIED LOCAL ANGENA KAOLINS AND EPOXY COMPOUND WORKING IN HIGHLY AGGRESSIVE ACID MEDIA

Tashkent state technical university, E-mail: ljw10921@gmail.com

Abstract. Background. Currently, there are a lot of fundamental and applied works devoted to the corrosion protection of the mechanical surfaces of parts of technological machines. One of the main factors is the electrochemical aggressive environment in which machine parts work. These problems are usually solved traditionally using non-ferrous metals and stainless steels instead of the usual structural. For large and complex configuration parts, this is very expensive and does not cover the cost of expenses. And the special anti-corrosion coatings of foreign manufacture known to date are quite currency intensive and do not justify the operating costs of locally produced technological equipment.

Рurpose.Development and research of anticorrosion coatings based on epoxy binder and modified local Angren kaolins.

Methodology. We have chosen for the study of the electrophysical properties of protective coatings the method of concentric electrodes using a Terra ohmmeter E6-13A and a DC bridge P4053.

Mathematical processing of the research results using the Lagrange interpolation fiction is performed.

Originality. The influence of highly aggressive acidic media on the polarized electrical resistances of organomineral mechanochemical modified protective coatings using local raw energy resources is revealed.

Findings.The compositions of organomineral materials for protective coatings are proposed for use on work surfaces operating in highly aggressive acidic environments. (92-98% H2SO4).

Key words: organomineral materials, anticorrosive coatings, electrochemical environment, epoxy compounds, resin, kaolin, filler, corrosion, polarizing electrical resistance.

Highlights:

* polarization resistance of protective coatings vary from 150-175 Ohms in 25 days;

* they can be used as protective coatings.

References

1. Asish Gandihi. Storage Tank Bottom Protection Using Volatile Corrosion Inhibitors //CORTEC CORP. Supplement to Material Performance. -Jenuary 2001. -P. 28−30.

2. A. Grossman. Corrosion of Aboveground Fuel Storage Tanks // Material Performance. -2005. -P.44.

3. Tyut'yev A.M. Progressivnyye tekhnologii dlya kapital'nogo remonta izolyatsionnogo pokrytiya MG// Gazovaya promyshlennost'. − 2005. – No 2. − S. 74.

4. N.N. Glazov, S.M. Ukhlovtsev, I.I. Reformatskaya i dr. Korroziya uglerodistoy stali v gruntakh razlichnoy vlazhnosti // Zashchita metallov. − 2006. − T. 42. − S. 645.

5. Medvedeva M.L. Korroziya oborudovaniya pri pererabotke nefti i gaza: ucheb posobiye dlya vuzov neftegazovogo profilya. − M.: RGU nefti i gaza imeni I.M. Gubkina, 2005.

6. Niz'yev S.G. Sovremennyye materialy i pokrytiya, ispol'zuyemyye dlya antikorrozionnoy zashchity magistral'nykh nefteprovodov // Korroziya, territoriya NEFTEGAZ. − 2007. − No 2.

7. R. Heidersbach. Metallergy and Corrosion Control in Oil and Gas Production. AjohnWiley&sons, inc.publication. -2011. -280 p.

8. Baldayev N.KH. Metallizatsionnyye protektornyye pokrytiya: Sbornik dokladov v kataloge II mezhotraslevoy konferentsii «Antikorrozionnaya zashchita». − 2011.

9. U.A.Ziyamukhamedova. Perspektivnyye kompozitsionnyye materialy na osnove mestnykh syr'yevykh i energeticheskikh resursov. – Tashkent. –TashGTU. -2011. – 160 s.

10. G.B.Yuldasheva i dr. Vysokoprochnyye materialy na osnove politraftoretilena: monografiya / G.B. Yuldasheva, S.V. Avdeychik, V.V. Voropayev, A.A. Skaskevich, A.A. Ryskulov; pod nauch. red. V.A.Struka. – Tashkent: «VEKTOR PRESS», 2012. – 320 s.

11. Ryskulov A.A. Nanokompozitsionnyye materialy na osnove sovmeshchennykh matrits dlya zashchitnykh pokrytiy. (pod red. akad. ANRUz, d.t.n., prof. O.U.Salimova i d.t.n., prof. V.A.Struka). – Tashkent: «Fan», 2010. – 304 s.

12. A.B. Dzhumabayev i dr. Osnovy obespecheniya ekspluatatsionnoy nadezhnosti geterokompozitnykh polimernykh materialov dlya detaley mashin: monografiya / Dzhumabayev A.B., Sobirov B.A., Miradullayeva G.B., Bakirov L.YU., Khalimov SH.A.; pod obshchey red. d.t.n., prof. A.B. Dzhumabayeva. –T.: TashGTU, 2018. -440 s.

13. Issledovaniye protsessov strukturoobrazovaniya geterokompozitnykh mashinostroitel'nykh materialov na osnove mestnykh mineralov i termoreaktivnykh polimernykh svyazuyushchikh. Otchot NIR GPFI-2. – Tashkent: TashGTU, 2017. -106 s. (promezhutochnyy).

14. Gonik A.A. Predotvrashcheniye sul'fidno-korrozionnogo rastreskivaniya otremontirovannykh stal'nykh rezervuarov // Zashchita metallov. − 2004. − T. 40. − No 3. − S. 325-328.

To cite this article: M. S. Li, G. B. Miradullaeva, U. A. Ziyamukhamedov. Development and application of anti-corrosion criticals based on modified local angena kaolins and epoxy compound working in highly aggressive acid media // Uzbek chemical journal. -2019. - Nr5. - Pp.28-36. 

Received: 04.09.2019; Accepted: 03.10.2019; Published: 07.10.2019

 

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UDK 631.84.313

А. А. Mamataliev

GRANULATED NITROGEN-SULFURCONTAINING FERTILIZERS BASED ON AMMONIUM NITRATE AND SULPHATE

Institute of General and Inorganic Chemistry, Academy of Sciences of the Republic of Uzbekistan

Abstract. Background. There are publications on non-caking, thermostable ammonium nitrate (AS) by adding inorganic materials. The problem of creating an explosion-proof fertilizer based on AS is solved in different ways. In Europe and Russia, by introducing dolomite or chalk into the melt. On alkaline carbonate soils of Uzbekistan, it is ineffective. In this regard, the development of a technology for producing an explosion-proof AS with the addition of a local material - ammonium sulfate is relevant.

Purpose. Studying the process of producing granular nitrogen-sulfur fertilizers with improved physicochemical and consumer characteristics based on the addition of ammonium nitrate (NH4NO3) and ammonium sulfate (NH4)2SO4 to the melt.

Methodology. Introduction into the NH4NO3 melt of ground (NH4)2SO4 followed by granulation of nitrate-sulfate melts by prilling, as well as determining the composition and properties of the finished products by known methods.

Originality. It was revealed that the use of the additive (NH4)2SO4 in the NH4NO3 melt at a mass ratio from 97 : 3 to 60 : 40 allows to increase the strength of nitrate granules by 2.4-4.9 times and to reduce their dissolution time by 1.5-2.5 times.

Findings. To granulate the nitrate-sulfate melt, a prilling method using a granulation tower was used. The composition and properties of new types of fertilizers were studied. It was shown that an increase in the amount of (NH4)2SO4  introduced into the AN melt from 3 to 40% reduces the nitrogen content in the product from 34.53% to 29.26%, but on the other hand increases the sulfur content from 0.70 to 9.59%. One of the main indicators of AN modification is the strength of its granules. If for pure AN without any additives and nitrate with a magnesia additive (0.28% MgO), it is - 1.32 and 1.58 MPa, respectively, then for fertilizer with the ratio NH4NO3 : (NH4)2SO4 = 60 : 40 it is 7.75 MPa.

Key words: ammonium nitrate melt, sulfate, nitrogen-sulfur fertilized, strength and dissolution rate of granules.

Highlights:

* nitrogen-sulfur-fertilizer granules via ammonium sulfate & NH4NO3 melt;

* their composition and properties are determined.

References:

1. A.K.Chernyshov, B.V.Levin, A.V.Tugolukov, A.A.Ogarkov, V.A.Il'in. Ammiachnaya selitra: svoystva, proizvodstvo, primeneniye //– M.: ZAO «INFOKHIM». – 2009. – 544 s.

2. Pod red. prof. V.M.Olevskogo. Tekhnologiya ammiachnoy selitry // M.: Khimiya. – 1978. – 312 s.

3. B.V.Levin, A.N.Sokolov. Problemy i tekhnicheskiye resheniya v proizvodstve kompleksnykh udobreniy na osnove ammiachnoy selitry // Mir sery, N, P i K. – Moskva. – 2004. – No 2. – S. 13-21.

4. V.V.Lavrov, K.K.Shvedov. O vzryvoopasnosti ammiachnoy selitry i udobreniy na yeyo osnove // Nauchno-tekhnicheskiye novosti: ZAO «INFOKHIM». – Spetsvypusk. – Moskva – 2004. – No 4. – S. 44-49.

5. N.Z.Milashchenko. Sul'fat ammoniya – perspektivnaya forma azotnogo udobreniya // Agrokhimicheskiy vestnik. – 2004. – No 2. – S. 3.

6. M.Ye.Pozin. Tekhnologiya mineral'nykh soley // Chast' II. – L.: “Khimiya”. – 1970 – 1558 s.

7. Tang Shuang-Ling, Lü Chun-Xu, Zhou Xin-Li, Wang Yi-Lin, Liu Zu-Liang. Issledovaniye modifitsirovannogo nitrata ammoniya II // Vliyaniye neorganicheskikh khimicheskikh udobreniy. Chin. J. Appl. Chem. – 2004. – 21. – № 4. – S. 400-404.

8. Patent 6689181 SSHA. MPK S05 S 1/00. Sul'fat-nitrat ammoniya // R.E.Highsmith, J.A.Kweeder, S.T. Correale. – Opubl. 10.02.2004 – RZHKhim. – 2004. – No 19 (II).

9. A.L.Taran, Shmelev S.L., V.M.Olevskiy, V.V.Kuznetsova, M.K.Rustambekov, A.M.Filonov, A.V.Taran. Issledovaniye vozmozhnosti granulirovaniya v bashnyakh ammiachnoy selitry s dobavkoy sul'fata ammoniya // Khimicheskaya promyshlennost'. – 1991. – No 12. – S. 743-749.

10. A.L.Taran, N.V.Konokhova. Issledovaniye protsessa i razrabotka tekhnologii proizvodstva NS – soderzhashchego mineral'nogo udobreniya v granulyatsionnykh bashnyakh // Uspekhi v khimii i khimicheskoy tekhnologii. – 2009. – t. 23. – No 7. – S. 72-75.

11. A.L.Taran, N.V.Konokhova, YU.A.Taran, D.S.Yakovlev. Proverka adekvatnosti matematicheskogo opisaniya protsessa granulirovaniya ammiachnoy selitry s sul'fatom ammoniya v kachestve napolnitelya v bashnyakh po khodu real'nogo protsessa // Khimicheskaya promyshlennost' segodnya. – 2011. – No 6. – S. 21-27.

12. A.I.Kazakov, O.G.Ivanova, L.S.Kurochkina, N.A.Plishkin. Kinetika i mekhanizm termicheskogo razlozheniya smesey nitrata i sul'fata ammoniya // Zhurnal prikladnoy khimii. – 2011. – t. 84. No 9. – S. 1465-1472.

13. A.A.Zavalin, S.A.Shafran, L.S.Chernova, L.N.Dubrovskikh. Novaya forma azotnogo udobreniya pod yarovuyu pshenitsu // Plodorodiye. – 2009. – No 1. – S. 19-20.

14. A.A.Zavalin, S.A.Shafran, L.S.Chernova, G.G.Blagoveshchenskaya, T.M.Dukhanina, L.E.Bayramov, L.N.Dubrovskikh. Otsenka effektivnosti primeneniya novoy formy azotnogo udobreniya // Agrokhimiya. – 2009. – No12. – S. 11-17.

15. M.M.Vinnik, L.N.Yerbanova, P.M.Zaytsev i dr. Metody analiza fosfatnogo syr'ya, fosfornykh i kompleksnykh udobreniy, kormovykh fosfatov // – M.: Khimiya. – 1975. – S. 213.

To cite this article: А. А. Mamataliev. Granulated nitrogen-sulfurcontaining fertilizers based on ammonium nitrate and sulphate  // Uzbek chemical journal. -2019. - Nr5. - Pp.37-42. 

Received: 05.08.2019; Accepted: 02.09.2019; Published: 07.10.2019

 

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UDK  628.358(043):66.067

S. M. Turabjanov, M. S. Li, G. B. Miradullaeva, U. A. Ziyamukhamedova

RESEARCH OF PROPERTIES AND QUALITY OF ANTICARROSION CROSSITIES BASED ON THERMOREACTIVE EPOXY OLIGOMER AND MECHANICALLY CHEMICAL MODIFIED KAOLIN FILLERS

Tashkent state technical university, E-mail: ljw10921@gmail.com

Abstract. Background. Studying the conditions and mechanism of the process of formation of nano-complex compounds in the filler-binder phase section at the micro- and nano-level in composite materials based on local raw materials with predetermined properties; establishing the dependence of the physico-chemical, technological and operational properties of composite materials on the nature and composition of the fillers; in order to expand the areas of use and development of the technology for the production of composite polymers with special properties is a requirement of the time. To protect the surfaces of technological equipment operating in highly aggressive environments, modified organomineral anticorrosive materials for coatings with the rational use of local raw energy resources have not been developed.

Purpose to development of scientifically based principles for managing the structure of nanophase and nanocomposite organomineral materials for corrosion-resistant coatings based on local raw materials and energy resources. The formation of thin-layer (2 mm) was carried out under the direct influence of solar energy in the conditions of the city of Tashkent (ambient temperature T = 42 ± 2°C).

Methodology. We have chosen methods and means for determining the electrophysical properties of organomineral composite materials to protect large-sized, complex configuration metal structures from corrosive corrosive environments. Optical microscopy was used to assess the quality of protective coatings.

Originality. A technology is proposed for producing various modification methods for mineral micro - and nanosized particles from local raw energy resources to produce various organomineral materials with the rational use of various grades of Angren kaolin.

Findings. A three-stage technology for the mechanochemical modification of Angren kaolins with a thermosetting epoxy compound was developed where a multifunctional agent-gassipole resin was used as the structure-forming.

Key words: activation-technological mechanics, mechanical activation, adhesion, electrochemical medium, epoxy compounds, resin, kaolin, filler, corrosion.

Highlights:

* the experimental densities (γэ) of the organomineral composition are in the range 1.25-1.51 t/m3 with a calculated density of the organomineral composition (γр) of 1.45 t/m3 depending on the time of mechanical activation.

References:

1. N.N. Glazov, S.M. Ukhlovtsev, I.I. Reformatskaya i dr. Korroziya uglerodistoy stali v gruntakh razlichnoy vlazhnosti // Zashchita metallov. - 2006. -T. 42. - S. 645.

2. R. Heidersbach. Metallergy and Corrosion Control in Oil and Gas Production. // AjohnWiley&sons, inc.publication, 2011. - 280 p.

3. Moiseyeva L.S., Kuksina O.V. O zavisimosti korrozii stali v beskislorodnoy vodnoy srede ot rN i davleniya SO2 // Zashchita metallov. - 2003. - T. 39. - No 5. - S. 542.

4. S.S. Ivanov, I.V. Makarikhin, YU.M. Mironov. Vzaimosvyaz' kharakteristik pochvy s korrozionnym razrusheniyem stal'nykh rezervuarov // Korroziya: materialy, zashchita. - 2009. - No 11. - S. 16−19.

5. Tyut'yev A.M. Progressivnyye tekhnologii dlya kapital'nogo remonta izolyatsionnogo pokrytiya MG// Gazovaya promyshlennost'. - 2005. -No 2. − S. 74.

6. U.A.Ziyamukhamedova. Perspektivnyye kompozitsionnyye materialy na osnove mestnykh syr'yevykh i energeticheskikh resursov – Tashkent, TashGTU, 2011 - 160 s.

7. Medvedeva M.L. Korroziya i ta oborudovaniya pri pererabotke nefti i gaza: ucheb posobiye dlya vuzov neftegazovogo profilya. − M.: RGU nefti i gaza imeni I.M. Gubkina, 2005.

8. M.L. Medvedeva, A.V. Muradov, A.K. Prygayev. Korroziya i zashchita magistral'nykh truboprovodov i rezervuarov: Uchebnoye posobiye dlya vuzov neftegazovogo profilya. - M.: Izdatel'skiy tsentr RGU nefti i gaza imeni I.M. Gubkina, 2013. - 250 s.

9. U.A.Ziyamukhamedova i dr. Antikorrozionnyye i gidroabrazivno–iznosostoykiye getero–kompozitnyye materialy na osnove polimerov i mestnykh mineralov: monografiya / U.A.Ziyamukhamedova, M.U. Turayev, A.KH. Khabibullayev, D.A.Dzhumabayev, L.M. – Tashkent: TashGTU, 2015 – 192 s.

10. Polimer-silikatnyye mashinostroitel'nyye materialy: fiziko-khimiya, tekhnologiya, primeneniye / S.V. Avdeychik i [dr.]; pod red. V.A. Struka, V.YA. Shcherby. – Minsk: Tekhnalogiya, 2007. – 431 s.

11. Avdeychik S.V. Vvedeniye v fiziku nanokompozitsionnykh mashinostroitel'nykh materialov / S.V. Avdeychik [i dr.]; pod. red. V.A. Loipo, V.A. Struka – Grodno: GGAU, 2010. – 439 s.

12. G.B.Yuldasheva i dr. Vysokoprochnyye materialy na osnove politraftoretilena: mono-grafiya / G.B. Yuldasheva, S.V. Avdeychik, V.V. Voropayev, A.A. Skaskevich, A.A. Ryskulov; pod nauch. red. V.A.Struka. – Tashkent: «VEKTOR PRESS», 2012. – 320 s.

13. Ryskulov A.A. Nanokompozitsionnyye materialy na osnove sovmeshchennykh matrits dlya zashchitnykh pokrytiy. (pod red. akad. ANRUz, d.t.n., prof. O.U.Salimova i d.t.n., prof. V.A.Struka) – Tashkent: «Fan», 2010. – 304 s.

14. A.B. Dzhumabayev i dr. Osnovy obespecheniya ekspluatatsionnoy nadezhnosti geterokompozitnykh polimernykh materialov dlya detaley mashin: monografiya / Dzhumabayev A.B., Sobirov B.A., Miradullayeva G.B., Bakirov L.YU., Khalimov SH.A.; pod obshchey red. d.t.n., prof. A.B. Dzhumabayeva. –T., TashGTU, 2018. -440 s.

15. Issledovaniye protsessov strukturoobrazovaniya geterokompozitnykh mashinostroitel'nykh materialov na osnove mestnykh mineralov i termoreaktivnykh polimernykh svyazuyushchikh. Otchot NIR GPFI-2. – Tashkent: TashGTU 2017. -106 s. (promezhutochnyy).

To cite this article: S. M. Turabjanov, M. S. Li, G. B. Miradullaeva, U. A. Ziyamukhamedova. Research of properties and quality of anticarrosion crossities based on thermoreactive epoxy oligomer and mechanically chemical modified kaolin fillers  // Uzbek chemical journal. -2019. - Nr5. - Pp.42-48. 

Received: 04.09.2019; Accepted: 03.10.2019; Published: 07.10.2019

 

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UDK 541.123.4

I. M. Miyassarov, A. S. Toghasharov, J. S. Shukurov, S. Tukhtaev

POLITERMA SOLUBILITY SYSTEMS NaClO3•CO(NH2)2-C10H12CaN2Na2O8-H2O

Institute of General and Inorganic Chemistry, Academy of Sciences of the Republic of Uzbekistan

Abstract. Background. As the world's population continues to grow, demand for land, water and agricultural products is increasing year by year. Increased productivity of existing arable land and soil composition obtained from local raw materials environmental pollution and research is required on the synthesis of drugs that do not have a harmful effect on human health. Short-term cotton harvesting in the republic's agriculture requires the creation of low-toxic defoliants with high-quality and comprehensive action.

Purpose. The aim of the study is the physico-chemical substantiation of the process of obtaining a complex cotton defoliant based on sodium monocarbamide chlorate and a complex macro element salt.

Methodology. For the physico-chemical substantiation of the process of obtaining a complex acting cotton defoliant, data were first obtained on the solubility and rheological properties of solutions in systems including sodium monocarbamidochlorate and a complex macrocell salt. The complex macrocell salt and sodium chlorate monocarbamide were initially synthesized, and their content was determined by chemical analysis. The synthesis was carried out using an electric thermostatic water bath DK-98-II A, a magnetic stirrer MM-2 A with heating, a rotary evaporator RE100-pro (DLab) and a desiccator SS-80-01 nt SPU 2001 (+200 0С). The work used visual-polythermal and pycnometric methods. The viscosity of the solutions was measured using a VPZh viscometer. The pH of the solutions was determined on a pH meter FE 20 METTLER TOLEDO and light refractive index using a PAL-BX / RI refractometer.

Originality. The physicochemical basis for the interaction of components in the system with the participation of water, sodium monocarbamidochlorate and calcium disodium salt of ethylene diamine tetraacetate was created, its polythermal solubility diagrams were constructed. To justify the process of obtaining a complex acting defoliant containing physiologically active substances, the “composition-properties” of the system [60%NaClO3•CO(NH2)2+40%H2O]- C10H12CaN2Na2O8 were studied.

Findings. Based on the solubility polytherms of binary systems and internal sections, a polythermal solubility diagram of the NaClO3•CO(NH2)2- C10H12CaN2Na2O8 – H2O system was constructed in the temperature range from -35.2 to 60 °C. In the polythermal solubility diagram, the fields of ice crystallization are distinguished: CO(NH2)2, NaClO3· CO(NH2)2, C10H12CaN2Na2O8•2H2O и C10H12CaN2Na2O8. The crystallization temperatures, viscosity, density, pH of the medium, and the refractive index of light and solutions of the system [60%NaClO3•CO(NH2)2+40%H2O]- C10H12CaN2Na2O8 depending on the ratio of the components were determined.

Key words: macroelement, chelate, system, diagram, binary system, defoliants, properties, crystallization temperature and pH of the medium.

Highlights:

* areas of crystallization of components in the system are identified;

* new data were obtained on the freezing temperatures from -35.2 to 60°C

* a polytherm solubility diagram was constructed.

References

1. SH.SH. Khamdamova, S.T, Tukhtayev, S.R. Mirsalimova, M.K. Askarova. «Kompleksnodeystvuyushchiye defolianty», - T: Izdatel'stvo «Navruz», 2017, -10 s.

2. Kurbanov E., Kuziyev R. Sovremennoye sostoyaniye plodorodiya pochv Uzbekistana i nekotoryye puti yego uluchsheniya // Gornyy vestnik Uzbekistana. – 2001. – Nr 1. -S.94-96.

3. Teshaev F., Khaitov B. Effect of defoliants and fertilizers on yield and quality of upland cotton (Gossypiumhirsutum L.) // Journal of Cotton Research and Development (CRDA). –India, 2015. - Nr 1. -P.57-60.

4. Pritulyak V.P. Khelaty, kratkiy obzor. OOO «AGROVIO UKRAINA» http://wwwchem.uwimona.edu.jm/courses/chelate.html.

 5. Plamennaya fotometriya: metod. ukaz. k lab. rabote. / Sost.: B.M. Stifatov, YU.V. Rublinetskaya. - Samara; Samar. gos. tekhn. un-t, 2017. –S.5-9.

6. TS 00203855-43:2014 Defoliant «UzDef». Tekhnicheskiye usloviya. 2014. – 15s.

7. Kalyukova Ye.N.Osaditel'noye i kompleksonometricheskoye titrovaniye: Metodicheskiyeukazaniya k laboratornoy rabote po analiticheskoy khimii. Ul'yanovsk: Ul-GTU, 2003. -S.20-21.

8. A.L. Podkorytov, L.K. Neudachina, S.A. Shtin. Okislitel'no-vosstanovitel'noye titrovaniye / Yekaterinburg Izdatel'stvo Ural'skogo universiteta – 2015, -19s.

9.Shukurov J.S., AskarovaM.A., Tukhtaev S. The solubility of components in the system NaClO3•CO(NH2)2-C2H5OH-H2O // Austrian Journal of Technical and Natural Sciences.- Nr 7-8. 2017 May-June. -pp. 69-72.

10. Manual of solubility / The responsible editor V.V. Kafarov, Moscow-Leningrad, Academy of Sciences of the USSR, 1961. V.1. Book 1, -960 p.

11. Kirgintsev A.N., Trushnikova I.N., Lavrentiyeva V.G. Solubility of inorganic substances in water. Leningrad. Chemistry Publishers. 1972. -248 p.

12. Trunin A.S. Petrova D.G. Vizual'no-politermicheskiy metod. Kuybyshevskiy politekhn. Ins-t. – Kuybyshev.: 1977, 94 s. Dep. v VINITI Nr 584-78.

To cite this article: I. M. Miyassarov, A. S. Toghasharov, J. S. Shukurov, S. Tukhtaev. Politerma solubility systems NaClO3•CO(NH2)2-C10H12CaN2Na2O8-H2O // Uzbek chemical journal. -2019. - Nr5. - Pp.48-54. 

Received: 10.09.2019; Accepted: 03.10.2019; Published: 07.10.2019

 

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ORGANIC CHEMISTRY

 

UDK 541. 64: 678. 745. 547. 235

K. M. Ismаilova, F. A. Umarov, M. M. Karimov, T. M. Babayev

PREPARATION OF POLYPEPTIDES BY THE METHOD OF HYDROLYSIS OF COCOON OF TRUTH SILK ORDER

National University of Uzbekistan, Tashkent c. 100174, E-mail: KMM142216@mail.ru

Abstract. Background. Recently, special attention has been paid to the chemistry of biomedical polymers, whose tasks are to solve the problems of chemical modification of natural and synthetic polymers, the synthesis of new polymers for use in pharmacology. Selection of the polymer carrier can be directed to regulate the properties of polymeric drug systems.

Purpose. The aim of the work is to find the optimal conditions for obtaining water-soluble polypeptides with high molecular weight with the highest yield and to determine their pharmacological effects on animal conditions.

Methodology. The course of the reactions was investigated by potentiometric titration, microscopy, and electrophoresis. Evaluation of the biological effects on animals was carried out by established tests.

Originaliti. An analytical approach to the hydrolysis reaction of the silkworm cocoon with caustic alkali solutions was applied and the pharmacological properties of the obtained polypeptides were established.

Findings. Optimal process conditions were found for obtaining water-soluble polypeptides with the highest yield by hydrolysis of cocoon with alkali solutions. Mathematically static analysis shows the influence of the nature of alkali on the process under study. It was established that the obtained polypeptides belong to the V class of practically nontoxic compounds.

Key words: silkworm cocoon, polypeptides, amino acids, hydrolysis, potentiometry, microscopy, electrophoresis, molecular weight, pharmacology.

Highlights:

* optimal conditions for the hydrolysis reaction were revealed;

* molecular mass of water-soluble polypeptides is 70000-75000 kDa;

* possibility of medicinal substances as a polymer carrier.

References

1. Usmanov KH.U., Sakiyev A.S., Yunusov A. //Shelk. 2008. - No4.- S.24-25.

2. Khabibullayev D.A., Korabel'nikov A.V., Abdurakhmonova M.R., Shukurov N.SH. Sovremennyye razvitiye shelkovoy otrasli Respubliki Uzbekistan//Res. konf. Aktual'nyye problemy proizvodstva kachestvennogo i konkurentosposobnogo kokonnogo syr'ya. Tashkent. 2017. -S. 260-263.

3. Shekor P., Hardingham M. //Interme-diate technology Publica-tions, London. 1995. - 55 p.

4. Usmanov KH.U., Sakiyev A.S., Yunusov A.// Shelk. 2008. - No 4.- s.24-25.

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6. Panarin Ye.F. Polimery v meditsine i farmatsii. S.-Peterburg.: Izd. Politekhnicheskogo universiteta, 2008. -S. 42-43.

7. Sericulture and Silk Production on http: www. ruralthehindia. org/bulletins// 2004. -P. 1-2.

8. Silkworn spins skin, http://www.nature.com/nsu/. 2004. P. 1-2.

9. Samoylov V.O. Meditsinskaya biofizika. M.; Spets. lit., 2007, -S. 18-506.

10. Belikov V.G. «Farmatsevticheskaya khimiya»., Moskva., Vysshaya shkola. 1985. 631 s.

11. JinH. J., DavidL. Kaplan.//Nature, 2003, Vol. 424, 1057–1061.

12. Ochilova R.KH. Sposob polucheniya seritsina i fibrotsina. Patent RF. RU 2385649. 2010. Byul. izobr. No2, 47.

13. FarreM., Petrovik M., Barcelo D.//Analytical and Bioana-lytical Chemistry. 2007, Vol. 387. -P. 1203-1214.

14. LaemmliU.//Nature.-1970. -Vol. 227. -P. 680-685.

15. Rukovodstvo po eksperimental'nomu (doklinicheskomu) izucheniyu novykh farmakologichechskikh veshchestv. Pod obshchey redaktsiyey chlenkorr RAMN prof. R.U. Khabriyeva. Moskva, 2005. -S.41. -S.695.

To cite this article: K. M. Ismаilova, F. A. Umarov, M. M. Karimov, T. M. Babayev. Preparation of polypeptides by the method of hydrolysis of cocoon of truth silk order // Uzbek chemical journal. -2019. - Nr5. - Pp.55-61. 

Received: 13.07.2019; Accepted: 09.09.2019; Published: 07.10.2019

 

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UDK 661.728.86

G. O. Mamazhanov, T. T. Safarov, Kh. C. Mirzakulov, Kh. S. Beknazarov

STUDY OF THE KINETICS OF THE PROCESS OF NITROCELLULOSE SYNTHESIS FROM PURIFIED CELLULOSE

Tashkent Institute of Chemical Technology, Tashkent c., Uzbekistan.

Abstract. Background. Despite the great potential of nitrocellulose as paints and varnishes, its use is currently limited to the use as a membrane for blood purification (hemodialysis), sorbents for stabilizing donor blood, and also for treating diseases caused by calcium metabolism.

Purpose. To solve this problem, it has become necessary to develop and obtain nitrocellulose using local raw materials from industrial waste as a raw material base with a combination of valuable and useful properties.

Methodology. To obtain colloxylin from cotton cellulose (or high purity wood pulp), a nitrating mixture of the following composition was used: HNO3 - 20%; H2SO4 - 60%; H2O - 20%.

Originality. Cellulose nitrate was synthesized with a degree of substitution of 11.2% (colloxylin) by a new low-concentrated method in a RKC solution. The effect of N2O4 and N2O3 in the process of nitrocellulose synthesis has been studied.

Findings. The nitriding process of cotton cellulose based on low concentrated nitric acid was studied. It was established that the esterification of cellulose with nitrating mixtures containing sulfuric acid and nitrogen oxides at different ratios, various samples of NC with a nitrogen content of up to 11.2% were obtained. The degree of substitution of the NС increases with an increase in the excess amount of N2O4 and N2O3 in the composition of the nitrating mixture, which is associated with an increase in the efficiency of water removal from the reaction zone.

Keywords: cellulose, cotton lint, nitrocellulose, colloxylin, nitric acid.

Highlights:

* nitration of cotton cellulose by low concentrated nitric acid;

* samples of cellulose nitrate with a nitrogen content of up to 11.2%.

References

1. Kaputskiy F. N., Yurkshtovich T. L. Lekarstvennyye preparaty na osnove proizvodnykh tsellyulozy. Minsk, 1989.

2. Sarybayeva R.I., Shchelokhova L.S. Khimiya azotnokislykh efirov tsellyulozy. // Frunze,1984, -S.109.

3. Compositions of polyacids and polyethers and methods for ther use in reducing adhesions : pat. 6869938 US, C l 514/75 /E. Herbert Schwarts, M. John Blackmore, M. Stephanie Cortese [et al.]. Publ. date 22.03.2005.

4. Rastvor glaznykh kapel' dlya profilaktiki ili lecheniya epiteliopatii rogovitsy : pat. 12147 BY, Int C l A 61 K 31/44 /N. K. Yurkshtovich, L. N. Marchenko, A. S. Fedulov [i dr.]. Opubl. 30.08.2009.

5. Novyye voloknistyye sorbenty meditsinskogo naznacheniya / I. N. Yermolenko [i dr.]. Minsk, 1978.

6. Yoon, J. Locally anisotropic porous materials from polyethylene and crystalliza-ble diluents /J. Yoon, A. J. Lesser, T. McCarthy // Macromolecules. – 2009. – V. 42, N. 22. – P. 8827 – 8834.

7. Pochivalov, K. V. Investigation of the amorphization process of partially crystal-line polymers byhydrostatic weighing in an inert liquid ./K. V. Pochivalov, O. V. Rozhkova, A. N. Vyalova, R. Yu. Golovanov, V. P. Barannikov, L. N. Mizerovskii // Fibre Chem. - 2011. - V. 43. -N. 3. - P. 217 - 221.

8. Wunderlich, B. Thermodynamic description condensed phases /B. Wunderlich // J. Therm. Anal. Calorim. – 2010. - V. 102. -N. 2. - P. 413 – 424.

9. Wunderlich, B. Thermal Analysis of Polymeric Materials /B. Wunderlich. – Ber-lin, Heidelberg, New York : Springer, 2005. - 910 s.

10. Mizerovskii, L. N. Diagrammy sostoyaniya sistem chastichno kristallicheskiy polimer–khoroshiy rastvoritel'.sistema izotakticheskiy polipropilen–m-ksilol/L. N. Mize-rovskii, K. V. Pochivalov, A. N. Vyalova // Vysokomolekulyar. soyedineniya. Ser. A. - 2013. - V. 55. -N. 5. - P. 505 - 5

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12. Eichhorn, S. Handbook of textile fibre structure: Fundamentals and manufactured polymer fibres. /Ed. by S. Eichhorn, J. W. S. Hearle, M. Jaffe, T Kikutani // Woodhead. - 2009. - Vol. 1. - 524 s.

13. Zavadskiy, A. Ye. Rentgenograficheskiy metod opredeleniya stepeni kristallichnosti tsellyuloznykh materialov razlichnoy anizotropii /A. Ye. Zavadskiy // Khim. vo-lokna. - 2004. - No 6. - S. 28 - 31.

14. Zavadskiy, A. Ye. Analiz geterogennosti sukhikh tsellyuloznykh volokon meto-dommalouglovoy rentgenovskoy difraktsii /A. Ye. Zavadskiy // Khim. volokna. - 2012. - No 6. - S. 62 – 65.

To cite this article: G. O. Mamazhanov, T. T. Safarov, Kh. C. Mirzakulov, Kh. S. Beknazarov. Study of the kinetics of the process of nitrocellulose synthesis from purified cellulose // Uzbek chemical journal. -2019. - Nr5. - Pp.62-67. 

Received: 19.08.2019; Accepted: 19.09.2019; Published: 07.10.2019

 

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UDK 541.123.6

1,2KH. A. Bozorov, 3KH. Gadoev, 2SH. SH. Sagdullaev, 4I. R. Askarov, 1H. A. Aisa

SYNTHESIS OF THIENO[2,3-D][1,3]OXAZINE-2,4-DIONES FROM 4,5-DISUBSTITUTED 2-AMINOTHIOPHENE -3-CARBOXYLIC ACIDS AND THEIR ANTIMICROBIAL ACTIVITIES

1Key Laboratory of Plant Resources and Chemistry in Arid Regions, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, South Beijing Rd 40-1, Urumqi, 830011, P. R. China Email: khurshedbek@gmail.com

2Institute of Chemistry of Plant Substances, Academy of Sciences of Uzbekistan, Mirzo Ulugbek str. 77, Tashkent, 100170, Uzbekistan

3Research Institution “Chinese-Tajik Innovation Center for Natural Products”, Ayni St. 299/2, Dushanbe 734063, Tajikistan

4Andijan State University, 129 st. Universitet, Andijan, 170100, Uzbekistan

Abstract. Background. Thieno[2,3-d][1,3]oxazine-2,4-diones has attracted a great deal of attention in the last decades. Condensation of its thiophene portion by many various ring systems has given rise to a large array of analogues. A synthesis, development and antimicrobial screening on the methods of preparation of oxazine-2,4-diones is given herein.

Purpose. Synthesis of 5,6-disubstituted thieno[2,3-d][1,3]oxazine-2,4-diones from their appropriate acids using triphosgene as reagent. Search perspective antimicrobial oxazines among this series and prepare more building-blocks toward the synthesis of thienopyrimidine scaffolds.

Methodology. Thieno[2,3-d][1,3]oxazine-2,4-diones was obtained via 2-amino-4,5-disubstitutedthiophene-3-carboxylic acids and triphosgene in dry dioxane by reflux. NMR spectra were recorded with a Varian 400 MHz NMR spectrometer. Antimicrobial testing was carried out by agar method.

Originality. Herein a convenient synthesis of some novel thieno[2,3-d][1,3]oxazine-2,4-diones is described using triphosgene. Substituents at position 4 and 5 in thiophene moiety were studied. Methyl and methylene groups influence on microbial strains.

Findings. A convenient one-pot synthesis of 5,6-di-substituted thieno[2,3-d][1,3]oxazine-2,4-diones was reported. It was found that triphosgene is best reagent for synthesis of fused oxazines. Some synthesized compounds showed average antimicrobial activity.

Key words: synthesis, thieno[2,3-d][1,3]oxazine-2,4-dione, oxazine, triphosgene, antimicrobial activity.

Highlights:

* synthesis of 5,6-di-substituted thieno[2,3-d][1,3]oxazine-2,4-diones using triphosgene;

* some of the synthesized compounds were found as antimicrobial agents;

* oxazines as building-blocks for synthesis of novel thienopyrimidine.

References

1. K. Bozorov, J.-Y. Zhao, B. Elmuradov, A. Pataer, H.A. Aisa, Recent developments regarding the use of thieno[2,3-d]pyrimidin-4-one derivatives in medicinal chemistry, with a focus on their synthesis and anticancer properties, European Journal of Medicinal Chemistry, -102, -2015; -P. 552-573.

2. M.B. Dewal, A.S. Wani, C. Vidaillac, D. Oupický, M.J. Rybak, S.M. Firestine, Thieno[2,3-d]pyrimidinedione derivatives as antibacterial agents, European Journal of Medicinal Chemistry, -51, -2012; -P. 145-153.

3. R.V. Chambhare, B.G. Khadse, A.S. Bobde, R.H. Bahekar, Synthesis and preliminary evaluation of some N-[5-(2-furanyl)-2-methyl-4-oxo-4H-thieno[2,3-d]pyrimidin-3-yl]-carboxamide and 3-substituted-5-(2-furanyl)-2-methyl-3H-thieno[2,3-d]pyrimidin-4-ones as antimicrobial agents, European Journal of Medicinal Chemistry, -38, -2003; -P. 89-100.

4. V. Alagarsamy, S. Meena, K.V. Ramseshu, V.R. Solomon, K. Thirumurugan, K. Dhanabal, M. Murugan, Synthesis, analgesic, anti-inflammatory, ulcerogenic index and antibacterial activities of novel 2-methylthio-3-substituted-5,6,7,8-tetrahydrobenzo (b) thieno[2,3-d]pyrimidin-4(3H)-ones, European Journal of Medicinal Chemistry, -41, -2006; -P. 1293-1300.

5. N.S. Shetty, R.S. Lamani, I.A.M. Khazi, Synthesis and antimicrobial activity of some novel thienopyrimidines and triazolothienopyrimidines, Journal of Chemical Sciences, -121, -2009; -P. 301-307.

6. L.D. Jennings, S.L. Kincaid, Y.D. Wang, G. Krishnamurthy, C.F. Beyer, J.P. McGinnis, M. Miranda, C.M. Discafani, S.K. Rabindran, Parallel synthesis and biological evaluation of 5,6,7,8-tetrahydrobenzothieno[2,3-d]pyrimidin-4(3H)-one cytotoxic agents selective for p21-deficient cells, Bioorganic & Medicinal Chemistry Letters, -15, -2005; -P. 4731-4735.

7. J. Deng, L. Peng, G. Zhang, X. Lan, C. Li, F. Chen, Y. Zhou, Z. Lin, L. Chen, R. Dai, H. Xu, L. Yang, X. Zhang, W. Hu, The highly potent and selective dipeptidyl peptidase IV inhibitors bearing a thienopyrimidine scaffold effectively treat type 2 diabetes, European Journal of Medicinal Chemistry, -46, -2011; -P. 71-76.

8. K. Bozorov, H.-R. Ma, J.-Y. Zhao, H.-Q. Zhao, H. Chen, K. Bobakulov, X.-L. Xin, B. Elmuradov, K. Shakhidoyatov, H.A. Aisa, Discovery of diethyl 2,5-diaminothiophene-3,4-dicarboxylate derivatives as potent anticancer and antimicrobial agents and screening of anti-diabetic activity: Synthesis and in vitro biological evaluation. Part 1, European Journal of Medicinal Chemistry, -84, -2014; -P. 739-745.

9. V.P. Litvinov, Thienopyrimidines: synthesis, properties, and biological activity, Russian Chemical Bulletin, -53, -2004; -P. 487-516.

10. S. Kasatkina, E. Stepanova, M. Dmitriev, I. Mokrushin, A. Maslivets, Divergent synthesis of (quinoxalin-2-yl)-1,3-oxazines and pyrimido[1,6-a]quinoxalines via the cycloaddition reaction of acyl(quinoxalinyl)ketenes, Tetrahedron Letters, -60, -2019; -P. 1235-1240.

11. S. Hajra, A. Hazra, S.K. Abu Saleh, One-Pot Synthesis of Enantiopure Spiro[3,4-dihydrobenzo[ b][1,4]oxazine-2,3′-oxindole] via Regio- And Stereoselective Tandem Ring Opening/Cyclization of Spiroaziridine Oxindoles with Bromophenols, Journal of Organic Chemistry, -84, -2019; -P. 10412-10421.

12. S. Azad, B.B.F. Mirjalili, One-pot solvent-free synthesis of 2,3-dihydro-2-substituted-1H-naphtho[1,2-e][1,3]oxazine derivatives using Fe3O4@nano-cellulose/TiCl as a bio-based and recyclable magnetic nano-catalyst, Molecular Diversity, -23, -2019; -P. 413-420.

13. S. Fang, Y. Zhao, H. Li, Y. Zheng, P. Lian, X. Wan, Cycloaddition of α-Diazocarbonyl Compounds and N-Tosylaziridines: Synthesis of Polysubstituted 2 H-1,4-Oxazines through Synergetic Catalysis of AgOTf/Cu(OAc) 2, Organic Letters, -21, -2019; -P. 2356-2359.

14. K. Bozorov, L.F. Nie, J. Zhao, H.A. Aisa, 2-Aminothiophene scaffolds: Diverse biological and pharmacological attributes in medicinal chemistry, European Journal of Medicinal Chemistry, -140, -P. 2017, 465-493.

To cite this article: KH. A. Bozorov, KH. Gadoev, SH. SH. Sagdullaev, I. R. Askarov, H. A. Aisa. Synthesis of thieno[2,3-D][1,3]oxazine-2,4-diones from 4,5-disubstituted 2-aminothiophene-3-carboxylic acids and their antimicrobial activities // Uzbek chemical journal. -2019. - Nr5. - Pp.67-73.  

Received: 16.09.2019; Accepted: 05.10.2019; Published: 07.10.2019

 

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UDC 544:723.21

1,2D. SH. SHakarova, 2A. A. KHolmuminov, 3F. Akhtar

RHEOLOGICAL CHARACTERISTICS OF TEMPLATE SYNTHESIS’S PROCESS OF NANOZEOLITE NAA IN THE THERMO REVERSIBLE GELS OF METHYLCELLULOSE

1,2Institute of General and Inorganic Chemistry, Uzbek Academy of Sciences, 2National University of Uzbekistan, 3Luleå University of Technology, Sweden

Abstract. Background. Recently, the special attention is given to nanoscale zeolite NaA, especially synthesized by hydrothermal synthesis. Nanozeolites appear to be quite effective in the purification of biogas from impurities. Adjusting the size of nanozeolites A possible to conduct the synthesis in a medium thermoreversible gels, particularly methylcellulose. Formation of nano-sized particles, ie, zeolite NaA crystal growth can be controlled by the viscosity of the reaction in medium rheology techniques.

Purpose: to identify the rheological characteristics of the formation of nano-sized zeolite NaA conducting the hydrothermal synthesis in the medium thermo-reversible methylcellulose gels.

Methodology. The rheological characteristics of nanosized zeolites NaA synthesis were investigated in the medium by rheometer Paar Physica MCR301 and control the formation of nanoparticles was supplied by the Peltier module. The viscosity of the reaction medium is determined at different equilibrium temperature, which was varied from 293 to 363 K in steps of 1 K/min.

Originality. The process of hydrothermal synthesis nanozeolite NaA was carried out controlling in the medium methylcellulose gel by rheology method. It is shown that the high efficiency of this approach of obtaining nanotzeolite NaA with defined dimensions in accelerating the reaction process at different temperatures.

Findings. Rheological investigation of the process of hydrothermal synthesis in the presence of nanozeolite NaA methylcellulose from 2 to 8% showed that gelation begins at 40°C and intensive growth of nanosized crystal samples observed at > 60°C. It determined that the nanoparticles are characterized by having a narrow size range 90 - 350 nm due to the synthesis reaction in the pores of the methylcellulose.

Keywords: hydrothermal synthesis, rheology, nanozeolite NaA, methylcellulose.

Highlights:

* rheological approach to the synthesis and control particles of nanozeolites NaA applied;

* samples of nanozeolites NaA are obtained with dimensions of 80 - 350 nm for biogas purification.

References

1.   Deborath R, Adrover M, Pedernera M. Green synthesis of nanocrystalline faujasite zeolite// Ultrasonics Sonochemistry – V.42, -2018. – P.303-309.

2.   Manuel Moliner. Direct Synthesis of Functional Zeolitic Materials// International Scholarly Research Network Materials Science – V.12, - 2012, - P.1-24.

3.   Teresa F., Enrico D., Candamano S. Crystallization and assembling of FAU nanozeolites on porous ceramic supports for zeolite membrane synthesis// Microporous and Mesoporous Materials – V. 228, - 2016. – P. 141-146.

4.   Xiuxiu Ren Yanshuo Li. Chapter 7 - Microporous Zeolite Membrane: Structure, Preparation, Characterization, and Application// Microporous Membranes and Membranes Reactors// - 2019. – P.157-183.

5.   Mintova S., Grand J., Valtchev V. Nanosized zeolites: Quo Vadis?// C. R. Chimie – V. 19, - 2016. – P.183-191.

6.   Zhang X., Liu H., Yeung K. Novel two-layered zeolite NaA-silicalite-1 membranes // Journal of Physics and Chemistry of Solids. -V. 66 -2005. - P. 1034–1038.

7.   Wang Y., Angelators A.S. Template synthesis of nanostructured materials via layer-by-layer assembly// Chem. Mater. – V.20. – 2008. - P.848-858.

8.   Huang Y., Ho J., Nakashima P., Wang H. Mesoporous carbon confined conversion of silica nanoparticles into zeolite nanocrystals// Microporous Mesoporous Mater. – V. 17. – 2009. – P. 490-496.

9.   Koohsaryan E., Anbia M. Nanosized and hierarchical zeolites: a short review Chinese Journal of Catalysis// - V.37, - 2016. – P.447-467.

10. Shakarova D., Ojuva A., Bergstom L., Akhtar F. Methylcellulose-Directed Synthesis of Nanocrystalline Zeolite NaA with high CO2 Uptake// Materials. – V.7. – 2014. - P. 5507-5519.

11. Li D., Ratnac K.R., Ringer S.P. Zeolite crystallization in cross linked chitosan hydrogels: Crystal size control and chitosan removal// Microporous Mesoporous Mater. – V.116. – 2008. P. 416-423.

12. Wei X.-L., Liang S. , Xu Y.-Y., Sun Y.-L., An J.-F. Methylcellulose-assisted synthesis of a compact and thin NaA zeolite membrane//, RSC Adv. – V.6.- 2016. - P.71863 -71866.

13. Meng X.,  Xiao F. Mesoporous Zeolite Templated from Polymers// - In book: Mesoporous Zeolites - 2015. P. 199-226.

14. Wang H., Holmberg B.A., Synthesis of template-free zeolite nanocrystals by using in situ termoreversible polymer hydrogels// J. Am. Chem. Soc. – V.125. - 2003. - P. 9928-9929.

To cite this article: KH. D. SH. SHakarova, A. A. KHolmuminov, F. Akhtar. Rheological characteristics of template synthesis’s process of nanozeolite NAA in the thermo reversible gels of methylcellulose // Uzbek chemical journal. -2019. - Nr5. - Pp.73-80. 

Received: 25.07.2019; Accepted: 26.08.2019; Published: 07.10.2019

 

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UDK 541. 669: 615.01

A. V. Filatova A. S. Turaev, D. T. Djurabaev

STUDY OF PHYSICAL AND CHEMICAL PROPERTIES OF THE PREPARATION POLYGEL ULTRA

Institute of Bioorganic Chemistry Acad. A. S. Sadykova, Academy of Sciences of the Republic of Uzbekistan E-mail: ibchem@uzsci.net

Abstract. Background. It is known that for ultrasound examinations, a contact medium is necessary, which ensures reliable contact between the patient's body and the sensor of the device. The development of a contact environment for ultrasound diagnostics is an urgent problem.

Purpose: to study the physicochemical properties of a medical device for ultrasound diagnostics Polygel Ultra.

Methodology. When developing a contact medium for ultrasound diagnostics, they were guided by the requirements of the State Pharmacopoeia XII and XIII editions, as well as by physicochemical, biopharmaceutical, technological and pharmacological methods for analyzing drugs.

Originality. The composition and technology of the drug for ultrasound diagnostics were developed for the first time and its physicochemical properties were investigated.

Findings. As a result of the research, a medical device for ultrasound diagnostics was obtained. It is shown that in terms of its operational characteristics, Polygel Ultra is at the level of world analogues.

Keywords: ultrasound diagnostics, contact medium, ultrasound, medical device, dimensional stability.

Highlights:

* physicochemical properties of a medical device for ultrasound;

* effectiveness of the drug is at the level of foreign analogues

References

1. Yermak E.H. // Ul'trazvukovaya diagnostika. 2000. -No1. -S.83-88.

2. Bagnenko, Yefimtseva, Zheleznyak: Ul'trazvukovaya diagnostika // Prakticheskaya ul'trazvukovaya diagnostika. Rukovodstvo v 5 tomakh. Tom 1. -C.7.

3. Shmidt, G. Ul'trazvukovaya diagnostika / G. Shmidt. - M.: MEDpress-inform, 2014. - 560 c.

4. Blyut, E. Ul'trazvukovaya diagnostika Praktich. resheniye klinicheskikh problem t.4 UZI v pediatrii / E. Blyut. - Vitebsk: Meditsinskaya literatura, 2011. - 160 c.

5. Mukharlyamov N.M., Belenkov YU.N., At'kov O.YU. Klinicheskaya ul'trazvu-kovaya diagnostika. Izd. Meditsina, 1987. -S.345.

6. Yevropeyskaya farmakopeya 2001" g., st. "Carbomers", -C. 306.

7. Astrakhanova M. M., K. V. Alekseyev Primeneniye sovremennykh metodov analiza dlya otsenki kachestva myagkikh lekarstvennykh form // Farmatsiya. - 1993. - No6. - S. 55-59.

8. Baranov A.I., Geller B.I., Larionov N.I. Primeneniye ul'traakustiki k issledovaniyu veshchestva. / MOPI. -2010. -Vyp.14. -S.81.

9. Mukharlyamov, N.M. Klinicheskaya ul'trazvukovaya diagnostika / N.M. Mu-kharlyamov. – M. : Meditsina - 1987. -T.1. -326 s.

10. Pal'mer, P.Ye. Rukovodstvo po ul'trazvukovoy diagnostike / P.Ye. Pal'-mer. – Shtat Kaliforniya, Kaliforniyskiy universitet Deyvis. : Vsemirnaya organizatsiya zdravookhraneniya v sotrudnichestve s Vsemirnoy federatsiyey po ispol'zovaniyu ul'trazvuka v meditsine i biologii -2000. -342s.

11. Filatova A.V., Dzhurabayev D.T Issledovaniye reologicheskikh svoystv ra-nozazhivlyayushchego gelya //Uzb.khim. zh. -2014. -No5. -S.34-38

12. Malkin A.YA., Kulichikhin S.G. Reologiya v protsesse obrazovaniya i pre-vrashcheniya polimerov. -M.: Khimiya. -1985. -140 s.

To cite this article: A. V. Filatova A. S. Turaev, D. T. Djurabaev. Study of physical and chemical properties of the preparation Polygel Ultra // Uzbek chemical journal. -2019. - Nr5. - Pp.80-85.  

Received: 05.08.2019; Accepted: 05.09.2019; Published: 07.10.2019

 

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UDK 544.77+543.544.743

J. R. Uzoqov, N. Q. Muxamadiev, Sh. M. Sayitqulov

PREPARATION OF NANOSORBENTS FOR CHROMATOGRAPHY BY SOL-GEL TECHNOLOGY BASED ON TETRAETOXISILANE AND METAL OXIDES

Samarkand State University, Samarkand c., e-mail: u.javlon03@gmail.com

Abstract. Background. The success of any chromatographic methods and the expansion of their field of application is determined by the choice of sorbents used and their specific interaction. In this regard, preparation of mesoporous nano-size sorbents based on local raw materials is one of the urgent problems.

Purpose. Preparation of mesoporous nanosorbents for chromatography based on SiO2, TiO2, Al2O3 and investigation of their phase composition, textural and physicochemical characteristics.

Methodology. Investigation of the phase composition by diffractometry and the textural characteristics of the samples by scanning electron microscopy.

Originality. The samples of mesoporous nanosorbents were synthesized using the “sol-gel” technology from metal oxides and tetroethoxysilane as a source of SiO2. It is proved that the obtained sorbents on phase composition, textural, physicochemical characteristics correspond to mesoporous nanosorbents.

Findings. Based on the “sol-gel” technology, the mesoporous nanosorbents have been synthesized using tetraethoxysilane, metal oxides and surfactant from polyethylenglycol. The rate constant - k and the activation energy-ΔEa of gel formation were determined by the method of their linear time transformation. The activation energy of the reaction is determined by plotting the curve of dependence of the gel formation time on the inverse temperature lnt0-1=f(1/T).

Keywords: mesoporosity, nanosorbent, sol-gel technology, specific volume, rate constant, diffractometry.

Highlights:

* specific volume and average diameter of the pores of nanosorbent;

* diameter of mesopores of nanosorbent samples is revealed.

References

1.   Khajeh, M., Laurent, S., & Dastafkan, K. (2013). Nanoadsorbents: classification, preparation, and applications (with emphasis on aqueous media). Chemical reviews, 113(10), 7728-7768.

2.   Muhamadiev N.Q., Saitqulov Sh.M., Uzoqov J. R. Hromatografiya uchun kremniy alkoksidlaridan zol-gel usulida nanosorbent olish. // “O‘zbekistonning iqtisodiy rivojlanishida kimyoning o‘rni" mavzusidagi respublika ilmiy-amaliy anjumani materiallari. -2018. -B.77-79.

3.   Shabanova N.A., Sarkisov P.D. (2012). Zol-gel tehnologii Nanodispersniy kremnezem -M.: BINOM. Laboratoriya znaniy, 328.

4.   Wang A., Kang, F., Huang Z., Guo Z., Chuan H. (2008). Synthesis of mesoporous carbon nanosheets using tubular halloysite and furfuryl alcohol by a template-like method. Microporous and Mesoporous Materials, 108(1-3), 318-324.

5.   Vunain E., Mishra A. K., Mamba B. B. Dendrimers, mesoporous silicas and chitosan-based nanosorbents for the removal of heavy-metal ions: A review //International journal of biological macromolecules. – 2016. – Т. 86. – С. 570-586.,

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To cite this article: J. R. Uzoqov, N. Q. Muxamadiev, Sh. M. Sayitqulov. Preparation of nanosorbents for chromatography by sol-gel technology based on tetraetoxisilane and metal oxides // Uzbek chemical journal. -2019. - Nr5. - Pp.85-91.  

Received: 28.12.2018; Accepted: 05.08.2019; Published: 07.10.2019

 

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