VOLUME NR 5
INORGANIC CHEMISTRY
UDK 541.123.6
J. S. Shukurov, A. S. Togasharov, S. Tukhtaev
POLYTHERM OF SOLUBILITY OF COMPONENTS IN THE SYSTEM [98 % NaClO3 ∙ CO(NH2)2 + 2 % H3PO4· CO(NH2)2] - [25 % NH3 + 75 % H2O] - H2O
Institute of General and Inorganic Chemistry of Uzbek Academy of Sciences
Abstract. Background. Chemical regulation of plant growth and development can be carried out not only in the early stages of ontogeny, but also during the main periods of crop formation. The harvest of some crops does not have time to ripen before the onset of autumn unfavorable weather, which leads to a reduction in its quantity and a decrease in the quality of the crop. To accelerate the maturation in the pre-harvest period, agrochemical preparations are used: defoliants and desiccants.
Defoliation is the artificial pre-harvest removal of plant leaves. After its carrying out by chemical substances - defoliants, nutrients are mixed from vegetative organs into generative ones - fruits and seeds.
Purpose. For the physico-chemical substantiation of the process of obtaining such effective drugs, we were interested in studying the mutual influence of the components in the system [98 % NaClO3 ∙ CO(NH2)2 + 2 % H3PO4· CO(NH2)2] - [25 % NH3 + 75 % H2O] - H2O.
Methodology. The determination of the chlorate ion was carried out by volume permanganatometric, sodium - method using flame photometric methods. Measurement of the viscosity of the solutions was carried out using a HPLC viscometer, the pH of the solutions was determined at pH meter FE 20 METTLER TOLEDO.
Originality. Polythermal and "composition-properties" of the diagram are created on the basis of the study of solubility in a system involving water, sodium monocarbamidochlorate, carbamide phosphate and ammonia water.
Findings. Based on polyterm binary systems and internal sections, a polythermic diagram of the system solubility was constructed [98 % NaClO3 ∙ CO(NH2)2 + 2 % H3PO4· CO(NH2)2] - [25 % NH3 + 75 % H2O] - H2O in the temperature range from -32.6 to 50.0 °C. The polythermic solubility diagram demarcates the crystallization fields of ice, carbamide, sodium monocarbamidochlorate and ammonium phosphate.
Keywords: solubility, system, diagram, concentration, defoliants, "composition-properties", crystallization temperatures, viscosity, density and pH of the medium.
Highlights:
* on the system, the crystallization fields of the components are delineated;
* optimal technological parameters for obtaining a liquid defoliant were established.
References
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To cite this article: J. S. Shukurov, A. S. Togasharov, S. Tukhtaev. Polytherm of solubility of components in the system [98 % NaClO3 ∙ CO(NH2)2 + 2 % H3PO4· CO(NH2)2] - [25 % NH3 + 75 % H2O] - H2O // Uzbek chemical journal.- 2018. - Nr5. - Pp.3-10.
Received: 03.08.2018; Accepted: 03.09.2018; Published: 09.11.2018
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UDK 669.849:66.081.312
1R. D. Allabergenov, 2S. N. Rasulova, 2V. P. Guro, 2U. N. Ruziev
REGULARITIES OF OXIDATION OF HEPTAUSULPHIDE RHENIUM AT RHENIUM CONCENTRATE PROCESSING
1GP "Central Laboratory" of the State Committee of Geology of the Republic of Uzbekistan, 2Institute of General and Inorganic Chemistry of Uzbek Academy of Sciences, vpguro@rambler.ru
Abstract. Background. Pyro- and hydrometallurgical methods are used to recover rhenium from secondary raw materials, the choice of the technological scheme of processing is determined by the type of raw materials and the available technological equipment. At the slurry fields of the JSC "Almalyk GMK" there were accumulated man-made wastes containing a scheme for extraction of rhenium from them by hydrothermal sulfidation. Rare metals in the sulphide collective concentrate formed by this method are present in the form of rhenium heptasulfide Re2S7, molybdenum and tungsten three-sulfides.
Purpose: to select the technological conditions for achieving the maximum completeness of conversion into the rhenium solution during oxidation of the sulfide phase of the collective rare metal concentrate - the product of hydrothermal sulphidation of tailings solutions of NPO JSC “Almalyk GMK”.
Methodology. The object of the study is a sample of a metal sulphide concentrate with a mass of 70.1 kg, composition, g/l: Re 0.056; Mo 0.76; W 0.30; Cu 1.1; Fe 0.40. Measurement of the redox-potential of the solutions was carried out using the potentiometer EV-74. Oxidants – oxygen and sodium nitrite. The sulfidization was carried out with ammonium sulphide. Elemental analysis was fulfilled on ICP-MS.
Originality. The behavior of rhenium heptaspulphide in the redox-process is studied. It has been shown that its oxidation in an oxygen-nitrite medium is thermodynamically possible, but there are kinetic limitations caused by the incorporation of unreacted particles of sulphide raw material by elemental sulfur. The regimes of the redox process were selected, which allowed to overcome the inhibiting effect of sulfur, bringing the process speed to the technological level.
Findings. The redox potentials of the systems providing rhenium, molybdenum, copper and iron leaching from the sulfide compounds have been measured.
Keywords: sulphide, rhenium, sodium nitrite, oxygen.
Highlights:
* behavior of rhenium heptaspulide in redox processes has been studied;
* thermodynamic calculation of the oxidation of rhenium heptaspulphide;
* rhenium leaching scheme from sulfide concentrate has been tested.
References
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4. Guro, V. P., 2012, "Ammonium perrhenate purification and rhenium recovery from heat-resistant rhenium-nickel superalloys". 21st International Conference on Metallurgy and Materials, Brno, Czech Republic, EU.
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9. Allabergenov R.D., Ahmedov R.K., Sabirov H.S., SHaripov R.H. Osnovnyie syir`evyie istochniki reniya i puti ego izvlecheniya // Geologiya i mineral`nyie resursyi. - Tashkent: -2010. - Nr. 5. -S.43-48.
10. S.T.Rasulova, V.P.Guro, R.D.Allabergenov, U.N.Ruziev. Izvlechenie reniya iz hvostohranilis`ha NPO AO "Almalyikskiy GMK" // Uzb. himich. zh. 2018, Nr.3. - S.22-29.
10. Allabergenov R.D., Sharipov Kh.T., Sharipov R.Kh., Niyazmatov A.A. Possibilities of oxidative lixiviation of rhenium sulphides by low pressures (Reniy: zakonomernosti okislitel`nogo vyis`helachivaniya soley reniya).-7th International Symposium on Technetium and rhenium - Science and Utilization. BOOK OF ABSRACTS. July 4-8, 2011, Moscow, Russia. 120 p.
12. V.P.Guro, M.A.Ibragimova, S.B.Rasulova, SH.D.SHamsiev. O neytralizacii serovodoroda v poputnyih vodah neftegazopromyislov // Uzb. himich. zh. - 2017, Nr.6. - S.64-69.
To cite this article: R. D. Allabergenov, S. N. Rasulova, V. P. Guro, U. N. Ruziev. Regularities of oxidation of heptausulphide rhenium at rhenium concentrate processing // Uzbek chemical journal.- 2018. - Nr5. - Pp.10-15.
Received: 04.06.2018; Accepted: 04.07.2018; Published: 09.11.2018
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UDK 661.632.14
A. A. Rasulov
UNARY PHOSPHORIC FERTILIZER AS ENRICHED SUPERPHOSPHATE BY MEAN OF DECOMPOSITION OF KYZYLKUM PHOSPHORITES WITH PHOSPHORIC ACID’s GYPSUM SLURRY
Institute of General and Inorganic Chemistry. Uzbek Academy of Science
Abstract. Background. At present, phosphorus-containing fertilizers produced in the republic are mainly complex nitrogen-phosphorus. They cannot be applied under autumn plowing. Since large nitrogen losses occur resulting of washing it out of the soil by atmospheric precipitation during the winter period before sowing. Generally, nitrogen must be brought before sowing, with sowing and in feeding, whereas phosphoric fertilizers are most effective for plowing. Therefore, it is necessary to increase the production of unary phosphoric fertilizers, such as simple and enriched superphosphates.
Purpose. Investigation of the process of obtaining the enriched superphosphate based on processing of mineralized mass with phosphoric acid gypsum slurry, which is used to produce complex NPSCa-containing fertilizer - Suprefos-NS .
Methodology. The phosphate raw material is dosed into the phosphoric acid gypsum slurry in such an amount that the weight ratio of the slurry to the feedstock to be from 100: 15 to 100:40. The components are reacted at a temperature of 70 °C for 60 minutes. Superphosphate mass was discharged from the reactor, ripens at 95-100 °C and cooled to produce product granules. In products of the form P2O5 are determined by photocolorimetric, CaO complexometric methods.
Originality. To produce enriched superphosphate, not a mixture of sulfuric and phosphoric acids was offered, but an intermediate product, suprephos-NS, a phosphoric acid gypsum pulp, which in-line process makes it feasible to provide a condition for non-thickened slurry.
Findings. It is shown that an increase in the mass fraction of phosphate raw material (PRM) with respect to phosphoric acid gypsum slurry (PAGS) does not effect on the total content of P2O5 in the product, but significantly reduces the relative contents of the assimilable and aqueous forms of P2O5 versus their general form. Thus, when using PAGS with ratio of L:S = 2:1 with an increase in the weight ratio of PAGS: PRM from 100: 15 to 100: 40 in products, the content of P2O5tot. is in the range 22.17-22.95%, and Р2О5acc. : Р2О5tot. by the citric acid decreases from 90.02 tо 71.08%, P2O5acc. : Р2О5tot. on trilon B from 83.05 tо 64.86% and P2O5wat. : Р2О5tot. from 82.83 tо 8.97%. respectively. Whereas using PAGS with ratio of L:S = 2.5:1 those indicates vary in ranges of 23.72-25.06%, from 90.26 to 71.46%, from 83.92 to 65.30% and from 83.24 to 9.32% respectively, and when L:S = 3:1 they are 27.13-27.94%, from 92.87 tо 73.09%, from 85.93 tо 66.83% and from 85.43 toо 16.51% respectively. Noted that all grades of PAGS as optimal weight ratio PAGS:PRM is 100:25 in which can be obtained enriched superphosphate with high total and acceptable Р2О5 while content of water soluble Р2О5 is no less 50%.
Keywords: phosphoric acid gypsum slurry, mineralized mass, decomposition, enriched superphosphate.
Highlights.
* the use of phosphoric acid gypsum pulp in the production of enriched superphosphate.
* the development is implemented on the equipment of the suprefos production of JSC "Ammofos-Maxam".
References
1. Prakticheskie rekomendacii po sel`skomu hozyaystvu: zemlya, voda, udobreniya. - Tashkent, 1996g. - 108 s.
2. Dvoynoy superfosfat. Tehnologiya i primenenie. / M.A.SHapkin, T.I.Zavertyaeva, R.YU.Zinyuk, B.D.Guller.-L.: Himiya, 1987. - 216 s.
3. Kopyilev B.A. Tehnologiya yekstrakcionnoy fosfornoy kislotyi. - L.: Himiya, 1972. - 312 s.
4. Gafurov K. Obesftorennyie udobreniya iz fosforitov Karatau. - Tashkent: FAN, 1992. - 200 s.
5. Namazov SH.S., Sadyikov B.S., Volyinskova N.V., Seytnazarov A.R., Isaev R.D., Beglov B.M. YEkstrakcionnaya fosfornaya kislota iz myitogo obozhzhennogo foskoncentrata Central`nyih Kyizyilkumov, soderzhas`hego 26% R2O5. // Himicheskaya promyishlennost`. - 2014. - t. 91, Nr.5. - S. 225-236.
6. Sadyikov B.B., Seytnazarov A.R., Ibragimov G.I., Namazov SH.S., Beglov B.M. Izuchenie vzaimodeystviya komponentov v sistemah NH4H2PO4-CaSO4•2N2O-N2O, (NH4)2HPO4-SaSO4•2N2O-N2O i NH4H2PO4-(NH4)2HPO4-SaSO4•2N2O-N2O. // Himicheskaya promyishlennost`. - 2006. - t. 83, Nr. 12. - S. 568-575.
7. Sadyikov B.B., Volyinskova N.V., Reymov A.M., Namazov SH.S. Beglov B.M. Izuchenie konversii gipsa v fosfornokislotnoy gipsovoy pul`pe pri rN 7,5. // Uzbekskiy himicheskiy zhurnal. - 2007. - Nr. 3. - S. 61-64.
8. Sadyikov B.B., Volyinskova N.V., Namazov SH.S., Beglov B.M. Tehnologiya proizvodstva azot-fosfor-seru-kal`ciysoderzhas`hego udobreniya pod nazvaniem "Suprefos". // Himicheskaya promyishlennost`.- 2008. - t. 85, Nr. 3. - S.127-134.
9. Patent RUz Nr.IAP 03481. Kl. SO5 S 11/00, SO5 V 11/00. Sposob polucheniya granulirovannogo slozhnogo azotnofosfornogo udobreniya. / G.I.Ibragimov, Z.K.Niyazov, B.B.Sadyikov, N.V.Volyinskova, D.A.YErgashev, A.I.Kononov, I.T.Rahimov, YU.CH.SHamsiev. - Byul. Nr. 10 ot 31.10.2007.
10. Vinnik M.M., Erbanova L.N., Zaycev P.M. i dr. Metodyi analiza fosfatnogo syir`ya, fosfornyih i kompleksnyih udobreniy, kormovyih fosfatov. - M.: Himiya, 1975. - 218 s.
To cite this article: A. A. Rasulov. Unary phosphoric fertilizer as enriched superphosphate by mean of decomposition of Kyzylkum phosphorites with phosphoric acid’s gypsum slurry // Uzbek chemical journal.- 2018. - Nr5. - Pp.15-22.
Received: 03.08.2018; Accepted: 03.09.2018; Published: 09.11.2018
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UDК 661.525.1
1М. Е. Аhmedov, 1А. Т. Dadakhodzhaev, 2V. P. Guro
SELECTION OF OPTIMAL MODE OF DOLOMITE DISSOLUTION IN WEAK NITRIC ACID
1Department of development and implementation of innovative technologies, scientific research and localization of production Uzkimyosanoat JSC, 2Institute of General and Inorganic Chemistry of the Academy of Sciences of Uzbekistan, Tashkent, Republic of Uzbekistan, innovatsiya2@uks.uz, innovatsiya1@uks.uz, vpguro@rambler.ru
Abstract. Background. Improving the commercial properties of ammonium nitrate is important for the following reasons: caking in storage, improving the strength of granules, which contributes to the increase in the thermal stability of fertilizer. To this end, studies are under way to select high-performance additives. In this regard, researchers are actively searching for new conditioning additives to ammonium nitrate. So, in factories producing it, magnesite (MgO) is successfully used as conditioning additives, which for 100% is imported to Uzbekistan. However, the raw material for the production of magnesium nitrate can be dolomite, whose deposits are available in the republic in sufficient quantities.
Purpose: to develop optimal conditions for processing dolomite by dissolving it in weak nitric acid, in a reactor with forced circulation of the liquid phase.
Methodology. Standard methods of processing of mineral raw materials by the nitric acid method, with pH control, elemental and chemical composition of solutions by volumetric and titrimetric methods of analysis.
Originality. The possibility of obtaining magnesium nitrate from local dolomite by its decomposition with nitric acid is established, followed by filtration of the resulting suspension, crystallization of calcium nitrate, removal of magnesium into the filtrate, separation and drying of the product.
Findings. A technological scheme for production of magnesium nitrate was developed, industrial tests were carried out, optimal technological parameters were established. The developed technology provides a high quality product with a lower cost compared to imported analogues.
Key words: dolomite, nitric acid, ammonium sulfate, magnesium nitrate, calcium nitrate, filtration, evaporation, crystallization.
Highlights:
* mgnesium nitrate from local dolomite was obtained;
* industrial tests of technology are conducted;
* the quality of the product is in accordance with the specifications;
* production of magnesium nitrate from dolomite is on run.
References
1. Shigreva Е.V. Sposobi uluchsheniya svoystva ammiachnoy selitri. IX Vserossiyskiy naychno-prakticheskaya konferensiya molodih ychyonih «Rossiya molodaya» 18-21 аprelya 2017.
2. Dmitrievskiy B.А., Yureva V.I., Smelik V.A., Teplenskiy N.A., Siganova N.А. I dr. Svoystva, polucheniy i primeneniy mineralnih udobreniy . -SPb.: Prospekt Nauki, 2013. – 326s.
3. Polyakov N.N., Kantor A.S., Grishaeva A.S. Stabilizituyushee deystviy fosfatno-sulfatnoy dobavki na plav ammiachnoy selitri pri yego uparki. // Аzotnaya promishlennost. – N3. – 1974. – s.15-17.
4. ОАО «Аzot» Postoyanniy tehnologicheskiy reglament №79 proizvodstvo granulirovannoy ammiachnoy selitri po sheme AS-72/ Kniga 1: Sklad I nasosnaya rastvora nitrata magniya. Otdeleniy neytralizasiy i viparki, granulyasiy i ohlagdeniy produkta. –Khemerova, 2015. – 289 s.
5. Kuvshinnikov I.M. Miniralniy udobreniya i soli: Svoystva i sposobi ikh uluchsheniya. M.: Khimiya, 1987. - 256s.
6. Proizvodstvo ammiachnoy selitri v agregatah bolshoy edinichnoy moshnosti / Pod red. V.М. Оlevskogo. М.: Khimiya, 1990. – 288 s.
7. M.E.Pozin. Tekhnologiya miniralnikh soley. Chast I., 1974. – S. 281-296.
To cite this article: М. Е. Аhmedov, А. Т. Dadakhodzhaev, V. P. Guro. Selection of optimal mode of dolomite dissolution in weak nitric acid // Uzbek chemical journal.- 2018. - Nr5. - Pp.22-27.
Received: 06.06.2018; Accepted: 06.07.2018; Published: 09.11.2018
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UDК 669.2
1M. M. Yakubov, 2A. M. Saynazarov, 3U. N. Ruziev, 3E. T. Safarov
ON NOVATION IN THE PROCESSING OF CONVERTER SLAGS OF COPPER PRODUCTION
1State Unitary Enterprise "Fan va Tarakkiet" Tashkent State Technical University. I. Karimov, 2“Almalyk MMC” JSC, 3Institute of General and Inorganic Chemistry, Academy of Sciences of the Republic of Uzbekistan.
Abstract. Background. In connection with the introduction of autogenous processes in the production of copper, there was a problem with the processing of converter slag. In it, the copper content is 2-7%, in connection with which it is a reverse product and according to the classical technology, it is processed in a reflective furnace. However, the reflective furnace cannot process the entire volume of converter slags obtained by converting the copper mattes of the furnace itself and the furnaces of autogenous smelting.
Purpose: development of low-waste and competitive production technology of blister copper, which allows to increase the yield of copper and reduce its content in the dump and converter slags, as well as the processing of converter slags in the Vanyukov furnace.
Methodology. The experiments were carried out in a laboratory setting to determine the solubility of the metal in the slag by filling the matte powder onto the surface of the melt and on an industrial reflective, converter furnace and the Vanyukov furnace at the Almalyk MMC JSC.
Originality. The processes of interaction of the components of model mixtures of copper slag compositions with multiphase compositions from non-ferrous metallurgy wastes, allowing to create an effective technology for the production of blister copper.
Findings. As a result of the study, the copper content (loss) in waste slags of the Vanyukov furnace was reduced (from 0.9-1.1% to 0.6-0.7%).
Keywords: copper, slag, converter slag, depletion, magnetite, restoration, clinker.
Highlights:
* proposed technological scheme of depletion of converter slags;
* slags were obtained by converting copper mattes in the Vanyukov furnace.
References
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6. YAkubov M.M. Negmatov S.S., Abdukadirov A.A., Saynazarov A.M. Issledovanie processa obedneniya konvertornyih shlakov medeplavil`nogo proizvodstva v promyishlennyih usloviyah OAO "Almalyikskiy GMK". Kompozicionnyie materialyi. - Tashkent, 2011. -Nr. - S. 61-63
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8. YAkubov M.M., Negmatov S.S., Farmanov A.K., Haspoladov V.SH. Osnovyi processov tehnologii obedneniya shlakov medeplavil`nogo proizvodstva. Tashkent, "Fan va tehnologiya", 2010. S.196
9. YAkubov M.M., Negmatov S.S., Haspoladov V.SH., Holmatov M.M., Abdukadyirov A.A., Saynazarov A.M. Issledovaniya vliyaniya magnetita konvertornogo shlaka na nastyileobrazovanie pri plavke mednyih koncentratov v otrazhatel`noy pechi //Kompozicionnyie materialyi. - Tashkent, 2012. -Nr.1. - S. 36-38.
10. M.M. YAkubov, Negmatov S.S., Saynazarov A.M., Abdukadyirov A.A., YOkubov O.M., Stepanova T.A. Teoreticheskoe issledovanie processa vosstanovleniya oksida trehvalentnogo zheleza // Kompozicionnyie materialyi, Tashkent, 2014. -Nr.2. - S.90
11. Sanakulov K. Nauchno-tehnicheskie osnovyi pererabotki othodov gorno-metallurgicheskogo proizvodstva. Tashkent. Fan. AN RUz 2009. S. 404.
12. Zaycev V.YA. Vanyukov A.V., YAkubov M.M., Li I.I. i dr. - Sposob pererabotki polimetallicheskih shteynov. Avtor. svid SSSR № 10328805, 1 aprelya 1983
13. YAkubov M.M., Negmatov S.S., Farmanov A.K., Haspoladov V.SH., Holmatov M.M. i d.r. Patent na izobretenie "Sposob plavki sul`fidnyih mednyih koncentratov v otrazhatel`noy pechi" Nr.IAP 04714, data 23.12.2013.
14. YAkubov M.M., Negmatov S.S., Saynazarov A.M., Abdukadyirov A.A., YOkubov O.M., Stepanova T.A. Osvoenie yeffektivnoy tehnologii processa konvertirovaniya mednyih shteynov na OAO "Almalyikskiy GMK" // Kompozicionnyie materialyi, Tashkent, 2013. -Nr.4 S. 90-91
15. YAkubov M.M., Stepanova T.A., YAkubov N.M. Issledovanie processa otrazhatel`noy plavki pri zagruzke predvaritel`no vosstanovlennyih konvertornyih shlakov kompozicionnyimi materialami s cel`yu povyisheniya izvlecheniya medi v shteyn // Kompozicionnyie materialyi, 2016. -Nr.2. - S. 82-83
To cite this article: M. M. Yakubov, A. M. Saynazarov, U. N. Ruziev, E. T. Safarov. On novation in the processing of converter slags of copper production // Uzbek chemical journal.- 2018. - Nr5. – Pp. 27-34.
Received: 01.11.2018; Accepted: 07.11.2018; Published: 09.11.2018
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УДК 66.023
1T. Z. Rakhmonov, 1U. K. Rakhmonov, 2O. Yu. Ismailov, 2A. M. Hurmamatov
RESEARCH OF HYDRODYNAMIC PARAMETERS OF DUST-TRAPPING PLANT
1LUKOIL Uzbekistan Operating Company, 2Tashkent State Technical University, 3Institute of General and Inorganic Chemistry, ANRUz
Abstract. Background. Protection of air pool from pollution by industrial emissions is currently one of the major problems affecting in varying degrees all the countries of the world. The issues of gas cleaning are now given great attention, and in-depth practical and theoretical studies are carried out in all industrialized countries, including Uzbekistan. At the same time, it is established that environmental protection issues are closely related to the technical capabilities of treatment devices that must meet the requirements of efficiency, operational reliability, low energy intensity.
Purpose. Determination of the optimal hydrodynamic regime and the development of empirical equations for calculating the operating parameters aimed at the development of a dust collector with a movable nozzle for the effective capture of submicron size particles taking into account their different nature of origin, particle size distribution.
Methodology. The article uses: statistical methods of processing of experimental data; methods of optimization of technological processes and production; proven conventional methods of experiments to study the laws of hydrodynamics using modern metrologically certified instrumentation and accurate methods of measurement of technological parameters.
Originality. The factors affecting the energy costs of the three-phase gas-liquid layer taking into account the design features and hydraulic parameters of the new dust collector are determined and empirical formulas are derived to calculate the gas filling and the amount of retained liquid depending on the energy costs of the ramjet device with a movable nozzle. As a result of researches the effective dust-collecting device for deep cleaning of industrial air of aerosols having on 20-25% lower hydraulic resistance, than devices of similar type is developed.
Findings. The support-distribution gratings of the sieve type with a free lattice cross section of 26.0, 34.0, 45.0 and 59.0% were investigated. As a nozzle used rubber nozzle size 20x20 mm with a weight of the nozzle element 30÷40 g. Reduction of the living cross-section of the lattice of the mesh type leads to a significant increase in hydraulic resistance. For example, at a gas velocity of 18 m/s, the hydraulic resistance of the "dry" support grating with a free cross section of 26% is 960 PA, and at a grating cross section of 59% – within 350 Pa. Similar phenomena are also observed at other gas velocities.
Keywords: particle density, gas velocity, hydraulic resistance, movable nozzle, jet-drip and jet-spray mode.
Highlights:
* due to the lack of a reference lattice ∆Р apparatus is reduced;
* amount of fluid retained increases with the height of the layer of the annular of nozzle type.
References
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6. Levsh I.P. Issledovanie yelementov gidrodinamiki barbotazha i psevdoozhizhennogo sloya oroshaemoy nasadki primenitel`no k intencifikacii i raschetu vyisokoproizvoditel`nyih kolonn // Avtoreferat dis. doktora tehn. nauk. Tashkent. 1975. - 45 s.
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9. Rahmonov U.K., Rahmonov T.Z. Issledovanie gidrodinamicheskogo soprotivleniya tarelki s psevdoozhizhennoy nasadkoy// Mezhdunarodnaya nauchnaya konferenciya "Innovaciya-2007", T.: TashGTU-2007, -S.150-151.
10. Bekker, V.F. Vliyanie raspredeleniya massyi po ob``emu nasadochnogo tela na strukturu potokov v kolonne s podvizhnoy nasadkoy / V.F. Bekker, I.F. Kissel`man // Innovacionnyiy menedzhment v proizvodstve i servise: Materialyi Vseros. nauchno-prakticheskoy konf. - Kostroma.: KGU im. H.A. Nekrasova, 2009. - S. 11-14.
11. Rahmonov U.K. Inercionno - turbulentnyiy mehanizm osazhdeniya ayerozoley. //Mezhdunarodnaya konferenciya "Sovremennyie problemyi gazovoy i volnovoy dinamiki" M.:, 2010. -S.38-40.
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To cite this article: T. Z. Rakhmonov U. K. Rakhmonov, O. Yu. Ismailov, A. M. Hurmamatov. Research of hydrodynamic parameters of dust-trapping plant // Uzbek chemical journal. - 2018. - Nr5. - Pp.35-44.
Received: 25.07.2018; Accepted: 08.11.2018; Published: 09.11.2018
UDK 548.737
1А. B. Ibragimov, 1B. S. Zakirov, 1G. К. Аlieva, 2J. М. Аshurov, 2B. Т. Ibragimov
SYNTHESIS AND STRUCTURE OF A NEW METAL COMPLEX ON THE BASIS OF 2-NITROBENZOIC ACID AND ETHYLENEDIAMINE
1Institute of General and Inorganic Chemistry, ANRUz, 2Institute of Biorganic Chemistry, ANRUz, E-mail: aziz_ibragimov@mail.ru
Abstract. Background. Mixed ligand compounds based on the simplest derivatives of benzoic acid and various amines that can exhibit new or enhanced properties by coordination with metals, including biological actions, are practically not synthesized. Therefore, we are carrying out a systematic study of the formation of new metal complexes on the basis of mono-derivatives of benzoic acid and various amines.
Purpose. Study of the formation of mixed-ligand metal complexes on the basis of ethylenediamine and 2-nitrobenzoic acid for the production of new metal complexes. Determination of the structure of synthesized compounds by physicochemical methods, in particular using X-ray diffraction analysis.
Methodology. Synthesis, elemental analysis and X-ray crystallography.
Originality. The new chemical compound was synthesized and its structure has been determined by X-ray diffraction analysis.
Findings. A new coordination compound in the form of a supramolecular complex or salt between a cation of the nickel complex with three molecules of ethylenediamine and an anion of 2-nitrobenzoate and its molecular structure.
Key words: 2-nitrobenzoic acid, ethylenediamine, Ni-complex, molecular and crystal structure, supramolecular complex.
Highlights:
* formation of a new compound in the form of a supramolecular complex on the base of two organic substances.
References
1. Ethanolamines and Ethylenediamine–Advances in Research and Application. 2013 Edition. Eds. Q.Ashton Acton. Scholarly editions, Atlanta, USA.
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7. J.M. Ashurov, A.B. Ibragimov, B.T. Ibragimov. Mixed-ligand complexes of Zn(II), Cd(II) and
Cu(II) with triethanolamine and p-nitrobenzoic acid: syntheses and crystal structures // Polyhedron. -14 December. -2015. –P. 441-446.
8. A. B. Ibragimov*, ZH. M. Ashurov, A. B. Ibragimov, ZH. ZH. Tashpulatov. Sintez, stroenie i fungicidnaya aktivnost` mono- i biyadernogo smeshanno-ligandnogokompleksa medi s p-nitrobenzoynoy kislotoy i monoyetanolaminom // Koordinacionnaya himiya. -2017. -T.43. -Nr6. -S. 376-384.
9. B.T. Ibragimov, J.M. Ashurov, L.Yu. Izotova, A.B. Ibragimov, T.F. Aripov. Supramolecular complexes on the basis of low-molecular carboxyl- containing biologically active compounds: synthesis, structure and activity // O‘zbekiston biologiya jurnali. -5. -2017. -B 16-27.
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To cite this article: А. B. Ibragimov, B. S. Zakirov, G. К. Аlieva, J. М. Аshurov, B. Т. Ibragimov. Synthesis and structure of a new metal complex on the basis of 2-nitrobenzoic acid and ethylenediamine // Uzbek chemical journal.- 2018. - Nr5. - Pp.45-48.
Received: 02.10.2018; Accepted: 08.11.2018; Published: 09.11.2018
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ORGANIC CHEMISTRY
UDК 563.6.086.83: 541:536.63
O. B. Klicheva, I. N. Nurgaliyev, S. Sh. Rashidova
SYNTHESIS OF N-CARBOXYMETYLCHITOZANE BOMBYX MORI AND CALCULATION OF ELECTRONIC CHARACTERISTICS OF THEIR MOLECULAR MODELS
Institute of polymer chemistry and physics, Academy of Sciences of the Republic of Uzbekistan, 100128, Tashkent, Uzbekistan, st. A. Kadyri, 7 b, phone: working (9989-71)241-85-94, home (998-71)241-85-93, E-mail: polymer@academy.uz
Abstract. Background. One of the promising areas for the development of the chemistry of high-molecular compounds is a section on the study of natural polysaccharides, in particular, chitosan and its derivatives, obtained from local raw materials (Bombyx mori silkworm pupae), which possess a number of unique properties. It is possible to obtain water-soluble forms of chitosan by carrying out the reaction of reducing carboxymethylation of chitosan with glyoxylic acid (GA), and calculating the energy of molecular models of chains of different lengths of N-carboxymethylchitosan using PM3 quantum-chemical method and molecular dynamics, of course, is the current direction.
Purpose. Obtaining water-soluble samples of N-carboxymethylchitosan with varying degrees of substitution (DS), identifying reactive functional groups under given conditions, and calculating the energy molecular models of N-CMCh.
Methodology. Conductometric titration, NMR, IR spectroscopy, semi-empirical quantum-chemical method PM3 and the method of molecular dynamics were used in the work.
Originality, by modifying Bombyx mori chitosan, they first synthesized water-soluble derivatives (N-CMCh), which were identified by NMR, IR spectroscopy, and plotted the energy and electronic characteristics of the number of monomer units in the macromolecular chain of N-CMCh.
Findings. Biologically active, natural, water-soluble samples of carboxymethylated chitosan were obtained and graphs of changes in the energy and electronic characteristics of the number of monomer units in the macromolecular chain of N-CMCh were plotted. Models of N-CMCh molecules consisting of 1-10 monomer units were constructed. For all molecules, the geometry was completely optimized, first by the method of molecular mechanics (MM +), then by the semi-empirical quantum chemical method PM3.
Keywords: chitosan, N-carboxymethylchitosan, NMR, IR-spectroscopy, molecular models.
Highlights.
* а water-soluble biologically active drug, N-carboxymethylchitosan, was synthesized;
* reactive functional groups were detected under given conditions.
Acknowledgements. The authors are grateful to the head of the laboratory of physicochemical research methods Ph.D. Abdullaev N.D. and staff of the Institute of Chemistry of Plant Substances for assisting in the conduct of NMR spectroscopy.
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To cite this article: O. B. Klicheva, I. N. Nurgaliyev, S. Sh. Rashidova. Synthesis of N-carboxymetylchitozane Bombyx mori and calculation of electronic characteristics of their molecular models // Uzbek chemical journal.- 2018. - Nr5. - Pp.49-54.
Received: 02.10.2018; Accepted: 02.11.2018; Published: 09.11.2018
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UDK 66.017
V. O. Kudyshkin, A. M. Futoryanskaya, E. K. Ivanova, S. Sh. Rashidova
MALLEINIZATION OF LOW MOLECULAR WEIGHT POLYETHYLENE
Institute of polymer chemistry and physics, Academy of Sciences of Uzbekistan, Tashkent, 100128, Uzbekistan, e-mail: polymer@academy.uz
Abstract. Background. Radical solution of the problem of polymer waste, according to most experts, is the development, production and use of biodegradable polymers. To create such biodegradable composite materials based on polyolefins and natural polysaccharides, the possibility of maleinization of low molecular weight polyethylene (LMPE) of the Ustyurt gas chemical complex was revealed in order to apply it as a link between the components of the composition.
Purpose. Increasing the reactivity of LMPE, by introducing into its structure reactive groups of maleic anhydride (MA), for further use of maleinated LMPE in polymer compositions.
Methodology. The grafting of MA on LMPE in the melt was carried out on a laboratory device. To prove the formation of a copolymer, the results of the extraction of the resulting mixture and the method of IR spectroscopy were used. Also, the methods of computer modeling were used.
Originality. In this paper, an attempt to malleinizate low-molecular weight polyethylene, which is a co-product of the linear polyethylene production on Ziegler-Natt catalysts, is made for the first time.
Findings. The results show the possibility of LMPE maleinization. The obtained maleinized LMPE can be useful for the creation of composite materials based on polyolefins.
Key words: low-molecular-weight polyethylene, maleic anhydride, copolymerization, biodegradable polymeric materials, computer simulation.
Highlights:
* the possibility of LMPE maleinization in the shear field have been shown;
* it makes possible to facilitate the interaction between molecules.
References
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6. SHuvaeva G.P., Studenikina L. N., Korchagin V. I. "Vliyanie modificiruyus`hih dobavok na biodestrukciyu vyisokonapolnennogo krahmalom poliyetilena" // Vestnik Voronezhskogo gosudarstvennogo universiteta inzhenernyih tehnologiy. - 2012. - Nr. 1. -S. 154.
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To cite this article: V. O. Kudyshkin, A. M. Futoryanskaya, E. K. Ivanova, S. Sh. Rashidova. Malleinization of low molecular weight polyethylene // Uzbek chemical journal.- 2018. - Nr5. - Pp.54-58.
Received: 08.10.2018; Accepted: 08.11.2018; Published: 09.11.2018
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UDK 547.458.88+664.292
N. T. Muydinov, G. A. Halilova, O. I. Radjabov, T. Gulyamov, A. S. Turaev
STUDY OF THE OBTAINING PROCESS OF WATER-SOLUBLE COLLAGEN COMPOSITIONS WITH NATURAL BIOMATERIALS
Institute of Bioorganic Chemistry, Academy of Sciences of the Republic of Uzbekistan, 100125, Tashkent, st. Mirzo Ulugbek, 83, ibchem@uzsci.net
Abstract. Background. The use of collagen in the pharmaceutical industry, in the technology of medicinal forms such as ointments, solutions, suppositories is limited because after alkali-salt treatment, it dissolves and swells in acids, alkalis, buffer solvents, but not in water. The introduction of additional components, especially such as acids and alkalis, can affect the bioavailability of medicinal substances, their chemical and biological compatibility, and therapeutic effect. Therefore, obtaining collagen soluble in water opens up wide possibilities for its application in the technology of medicinal forms.
Рurpose: to study the compatibility of collagen with water-soluble polysaccharides and to obtain medications on their basis.
Methodology. Viscosity, shear stress, shear rate gradient are the main rheological characteristics.
The rheological dependences were recorded on a Rheotest II rotational viscometer (MessgerateMedingen GmbH, Germany), which allows the measurement of viscosity. Measurements were carried out at a temperature range from 25°C to 50°C, in a wide range of viscosity, a shear stress range of 2-280 Pa, a shear rate range of 1.5 to 1310 s-1, a speed of 5/13–243 min-1, and measurement accuracy 3-4%.
Originality. Collagen compatibility with water-soluble polysaccharides has been studied for the first time.
Findings. Compositions consisting of collagen, carboxymethylcellulose (CMC) and polysaccharides derived from basidiomycetes have been obtained and investigated. A swollen collagen mass with a neutral medium, purified from related substances, in the form of a test-like mass is mixed with a dry amount of water-soluble polysaccharides extracted by hydrolysis from basidiomycetes and CMC.
Keywords: collagen, collagen mass, carboxymethylcellulose, sum of polysaccharides, rheology, shear stress, dynamic viscosity.
Highlights:
* rheological properties of compositions based on biopolymers were studied;
* the dependence of the viscosity of the compositions on the structure of biopolymers was established.
References
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8. Vinogradov G.V., Malkin A.YA. Reologiya polimerov // M.: Himiya, 1977. 440 s.
9. Papkov S.P. Fiziko-himicheskie osnovyi pererabotki rastvorov polimerov // Himiya, M., 1971.372s.
10. Parker, R. Aspects of the Physical Chemistry of Starch / R. Parker, S.G. Ring // Journal of Cereal Science. - 2001. - Vol. 34 - P. 1-17.
11. Krupennikova V.E. Radnaeva V.D. TanganovB.B. Opredelenie dinamicheskoy vyazkosti na rotacionnom viskozimetre Brookfield RVDV-II+ Pro: Metod. ukazanie - Ulan-Udye: Izd-vo VSGTU, 2011, 48 s.
12. V.D. Kosoy, YA.I. Vinogradov, A.D. Malyishev. Inzhenernaya reologiya biotehnologicheskih sred / - SPb: GIORD, 2005. - 648 s.
To cite this article: N. T. Muydinov, G. A. Halilova, O. I. Radjabov, T. Gulyamov, A. S. Turaev. Study of the obtaining process of water-soluble collagen compositions with natural biomaterials // Uzbek chemical journal.- 2018. - Nr5. - Pp.59-63.
Received: 08.10.2018; Accepted: 08.11.2018; Published: 09.11.2018
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UDK 678.742.046
1B. A. Normurodov, 1Kh. Kh. Turaev, 2F. N. Nurkulov, 2A. T. Jalilov
STUDY OF THE COMPOSITION AND THERMAL CHARACTERISTICS OF SULTA-, NITROGEN AND PHOSPHORUS-CONTAINING OLIGOMER
1Termez State University, 2LLC Tashkent Scientific Research Institute of Chemical Technology
Abstract. Background. The main modern world trend in the development of any type of products is the creation on its basis of a wide range of models, types, brands, modifications that ensure the effective development of a rapidly growing modern economy, expanding the scope of products that increase the volume of its output. This trend is fully typical for modern, especially thermoplastic polymer materials. The production of new synthesized highly additive additives for polymeric materials, which have high heat resistance and flame retardant efficiency, stabilization of polymers, ecologically safe and economical for today, is an urgent task.
Purpose. The aim of the study is to study the composition and thermal characteristics of sulfur, nitrogen and phosphorus-containing oligomer
Methodology. Physicochemical properties were studied: density, melting point, solubility, IR spectroscopy, and DSC in a sulfur, nitrogen, and phosphorus-containing oligomer.
Originality. A new sulfur-, nitrogen- and phosphorus-containing oligomer of NDP-3 brand was synthesized.
Findings. IR-spectroscopic studies were performed to determine the composition of the new synthesized oligomer. The effect of the oligomer on the DSC process of a sulfur, nitrogen and phosphorus-containing oligomer of the NDP-3 brand was studied. The weight of the NDP-3 sample does not change to 207 °C. A single endothermic peak (at 250 °C) is observed on the DSC curve in the temperature range 20 -370 °C, which corresponds to the melting of the sample.
Key words: phosphorus-containing oligomer, nitrogen-containing compounds, viscosity, oligomers.
Highlights.
* The physico-chemical properties of the sulfur, nitrogen, and phosphorus-containing oligomer were studied.
References
1. Kerber M. L., Vinogradov V. M., Golovkin G. S. i dr. Polimernyie kompozicionnyie materialyi: struktura, svoystva, tehnologiya: ucheb. posobie // SPb.: Professiya, 2008. -560 s.
2. Egorova O. V., Artemenko S. E., Kadyikova YU. A. Poliyetilenovyie kompozicii, napolnennyie dispersnyim bazal`tom // Plasticheskie massyi,2012. -Nr.9. -S. 38 -39.
3. SHostak T. S., Budash YU. A., Paharenko V. V., Stashkevich I. A., Paharenko V. A. Kompozicii na osnove PYE, napolnennyie alyumosilikatom // Plasticheskie massyi, 2011. -Nr.4. -S. 39-43.
4. Ney Zo Lin., Aver`yanova M.N., Osipchik V.S., Kravchenko T.P. Strukturno-mehanicheskie svoystva vyisokonapolnennyih poliolefinovyih kompoziciy // Uspehi v himii i himicheskoy tehnologii, 2014. -T. XXVIII. Nr.3(152). S.55-57
5. Tozhiev P.ZH., Normurodov B.A., Turaev H.H., Nurkulov F.N. *, Dzhalilov A.T.* Izuchenie fiziko- mehanicheskix svoystv vyisokonapolnennyih poliyetilenovyih kompoziciy // UNIVERSUM : Himicheskaya tehnologiya : yelektronnyiy nauchnyiy zhurnal 2018. -Nr.2 (47).
6. B.A. Normurodov, P.ZH.Tozhiev, H.H.Turaev, F.N. Nurkulov, A.T.Dzhalilov Izuchenie fiziko-himicheskix svoystv sero-,azot-i fosforsoderzhas`hih oligomerov // Tashkent : Kompozicionnyie materialyi-2017.- Nr.4.-S.8-10
7. B.A. Normurodov, P.ZH.Tozhiev, H.H.Turaev, A.T.Dzhalilov, F.N. Nurkulov Izuchenie fiziko-mehanicheskix svoystv bazal`tosoderzhas`hih poliyetilenovyih kompoziciy //Tashkent : Kompozicionnyie materialyi-2017.- Nr.4.-S.10-12
8. B.A. Normurodov, P.ZH.Tozhiev, H.H.Turaev, A.T.Dzhalilov Sintez i ik-spektroskopicheskoe issledovanie serosoderzhas`hego oligomera // UNIVERSUM : Himiya i biologiya : yelektronnyiy nauchnyiy zhurnal 2018 Nr.2 (44).
To cite this article: B. A. Normurodov, Kh. Kh. Turaev, F. N. Nurkulov, A. T. Jalilov. Study of the composition and thermal characteristics of sulta-, nitrogen and phosphorus-containing oligomer // Uzbek chemical journal.- 2018. - Nr5. - Pp.64-68.
Received: 29.06.2018; Accepted: 04.08.2018; Published: 09.11.2018
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UDK 628.54.161.1
F. M. Yusupov, Y. R. Yakhshiyeva, J. Sh. Nurmukhammadov, G. A. Baymatova
CHEMICAL ANALYSIS OF VARIOUS WATERS USED IN THE MUBARAK GAS PROCESSING PLANT
Institute of General and Inorganic Chemistry of Uzbek Academy of Sciences
Abstract. Background. He purification of water in the production of chemicals and irrigation in our Republic is becoming a major problem. In oil production and cleaning of wells, cooling of reactors and their cleaning, when discharging chemical waste, reservoirs are polluted with various aliphatic and aromatic hydrocarbons, heavy metals that do not dissolve in water, and water-soluble aggressive gases.
Purpose: to purify and soften the production waters of the Mubarek Gas Processing Plant with chemical reagents and their production test.
Methodology. In the analysis of industrial waters, classical analytical methods, methods of water analysis, methods of organic chemistry were used. The analysis of industrial waters at the enterprises of IGPP was carried out before and after cleaning and softening with chemical reagents.
Originality. Water softening and precipitation of salts were carried out with the help of chemical reagents, developed by the staff of the laboratory "HT and SAW" of the Institute of general and inorganic chemistry of Аcademy of sciences of Republic of Uzbekistan.
Findings. Various samples of water KNS-38, circulating water, KNS-224-38a, KNS-835, phlegm taken from the Mubarek gas processing plant were analyzed. With the help of chemical reagents, water was softened and salts precipitated.
Keywords: chemical reagents, hydrocarbons, metal ions, oil, oil products, salt, softening, precipitation.
Highlights:
* physicochemical properties of water taken from the Mubarek Gas Processing Plant have been studied;
* softening and precipitation of salts in various water samples;
* various samples of water taken from the Mubarek Gas Processing Plant were tested.
References
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2. Galiulin R.V., Bashkin V.N. Zagryaznenie vodnoy sredyi uglevodorodami: risk, profilaktika i remediaciya // Voda: himiya i yekologiya. 2011. -Nr.07. -S.19-24.
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5. Volovicheva N.A., Vezencev A.I., Goldovskaya-Pernstaya L.F. Sravnitel`naya ocenka sposobnosti nativnyih glin Belgorodskoy oblasti sorbirovat` ionyi zheleza (III) iz vodnyih rastvorov // Nano- n supramolekulyarnaya himiya v sorbcionnyih i ionoobmennyih processah: materialyi Vserossiyskoy konferencii s yelementami nauchnoy shkolyi dlya molodezhi (g.Belgorod, 14-17 sentyabrya 2010 g.). - Belgorod: Izd-vo BelGU, 2010.-S.37-40.
6. Goldovskaya-Peristaya L.F. Izoterma sorbcii ionov stronciya montmorillonit-gidroslyudistyimi glinami / L. F.Goldovskaya-Peristaya, N.A.Volovncheva, A.I.Vezencev [i dr.] // Sorbcionnyie i hromatograficheskie processyi. 2011. T.P. -Vyip.2. -S.165-171.
7. Volkova M.A. Novyiy vyisokotehnologichnyiy alyumokremnievyiy flokulyant- koagulyant kak al`ternativa izvestnyim reagentam vodoochistki // Sbornik statey Mezhdunarodnoy nauchno- prakticheskoy konferencii "Aktual`nyie problemyi himicheskoy nauki, praktiki i obrazovaniya" (19-21 maya 2009 goda, g. Kursk). CHast` 2. - S. 19-22
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9. Prohas`ko L. S. Tehnologiya kavitacionnoy dezintegracii pis`hevyih sred. V sbornike: Nauka. YUzhno-Ural`skiy gosudarstvennyiy universitet. Materialyi 65-1 nauchnoy konferencii. -2013. -S. 32-35.
10. YArmarkin D. A., Prohas`ko L. S., Mazaev A. N., Asenova B. K., Zinina O. V., Zalilov R. V. Kavitacionnyie tehnologii v pis`hevoy promyishlennosti. Molodoy uchenyiy. -2014. - Nr. 8. -S. 312-315.
11. Prohas`ko L. S., YArmarkin D. A. Ispol`zovanie gidrodinamicheskoy kavitacii v pis`hevoy promyishlennosti. Sbornik nauchnyih trudov Sworld. -2014. -T. 7. - Nr. 3. S. 27-31.
12. YArmakin D. A., Prohas`ko L. S., Mazaev A. N., Perehodova E. A., Asenova B. K., Zalilov R. V. Perspektivnyie napravleniya kavitacionnoy dezintegracii. Molodoy uchenyiy. -2014. - Nr. 9 (68). - S. 241-244.
To cite this article: F. M. Yusupov, Y. R. Yakhshiyeva, J. Sh. Nurmukhammadov, G. A. Baymatova. Chemical analysis of various waters used in the Mubarak Gas processing plant // Uzbek chemical journal.- 2018. - Nr5. - Pp.68-73.
Received: 11.07.2018; Accepted: 11.08.2018; Published: 09.11.2018
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ANALYTICAL CHEMISTRY
UDK 543.251:541.25:541.13:541.8.
N. Kh. Qutlimurotova, Z. A. Smanova, M. R. Yuldasheva
AMPEROMETRICAL DETERMINATION OF SCANDIUM BY SOLUTION β-HYDROXYETHYLIMIDE
National University of Uzbekistan, E-mail: Nigora.qutlimurotova@mail.ru
Abstract. Background. Role of scandium and it`s compounds in industry and natural economy in great because they are used at production of high-temperature ceramics, quantum-mechanical intensifiers, lasers, emission materials, dielectrics, solid electrolytes, halogen lamps, catalysts and so on. By this reason elaboration of methods with high sensibility and wide diapason od determined concentrations is very important problem. Also there methods must be simple according to apparatuses and methodical mounting and also they must be characterized by quickies of carring out low cost of analysis.
Purpose: elaboration of amperometrical method of determination of scandium ions by β-gydroxyethylimide.
Methodology. In these investigations potentiometry, culonometry, polayrographiya, voltamperometry, amperometric titration were used
Originality: determination of scandium ions by new synthesized reagent β-gydroxyethylimide with method of amperometric titration was fulfilled for the first time.
Findings: process of complexoformation ions of scandium by solution of β-gydroxyethylimide has been investigated; optimal conditions of complexo-formation were determined and also number of electrooxidation were found out. Optimal acidity of medium of titration was found to be in interval pH 1-3.
Key words: scandium, amperometrical titration, β-gydroxyethyimide, logarithmic analysis, half wave potentials.
Highlights:
* amperometrical determination of scandium by solution of β-gydroxyethylimide was carried out;
* constant of stability of the complex has been determined by logarifmetical method.
References
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To cite this article: N. Kh. Qutlimurotova, Z. A. Smanova, M. R. Yuldasheva. Amperometrical determination of scandium by solution β-hydroxyethylimide // Uzbek chemical journal.- 2018. - Nr5. - Pp.74-80.
Received: 13.09.2018; Accepted: 07.11.2018; Published: 09.11.2018
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