Chemical Bulletin of Kazakh National University最新文献_第2页

Thermal degradation of primary coal tar distillate in the presence of iron nanopowder 纳米铁粉存在下初级煤焦油馏分的热降解

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Chemical Bulletin of Kazakh National University Pub Date : 2022-09-20 DOI: 10.15328/cb1278

Sergey Kim, M. Baikenov, D. Aitbekova, K. Ibishev, M. Meiramov, Fengyun Ma

{"title":"Thermal degradation of primary coal tar distillate in the presence of iron nanopowder","authors":"Sergey Kim, M. Baikenov, D. Aitbekova, K. Ibishev, M. Meiramov, Fengyun Ma","doi":"10.15328/cb1278","DOIUrl":"https://doi.org/10.15328/cb1278","url":null,"abstract":"Impact of the nanosized iron powder on the process of thermal degradation of coal tar distillate was determined by the thermogravimetric analysis. Coal tar distillate was obtained by simple distillation up to 350°C of primary coal tar from the Shubarkol deposit. Iron powder was obtained by electrochemical reduction of iron from sulfate electrolytes at simultaneous impact of high-voltage electric discharge on cathodic zone. Scanning electron microscopy showed that iron powder consists of nanosized particles (30-124 nm) forming aggregates. X-ray diffraction analysis revealed the presence of α-Fe and FeO(OH) phases. The average crystallite size determination was made using Scherrer equation and amounted to 31.7 nm. Obtained iron powder was added to the coal tar distillate in amount of 1% of distillate weight and this mixture was subjected to thermal degradation at heating rate 5°C/min in an inert atmosphere. Processing of the data obtained was carried out using the model-fitting Coats-Redfern method. The values of activation energy were calculated from the linear approximation constructed as a result of processing thermoanalytical data. It was found that the addition of iron powder in amount of 1% to the coal tar distillate reduces the activation energy from 153.98 kJ/mol to 84.48 kJ/mol.","PeriodicalId":9860,"journal":{"name":"Chemical Bulletin of Kazakh National University","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48068943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of the effectiveness of commercial demulsifiers based on polyoxyalkylated compounds in relation to oil and water emulsions of the Sarybulak oilfield 基于聚氧化烷基化合物的商业破乳剂对Sarybulak油田油水乳液的有效性评价

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Chemical Bulletin of Kazakh National University Pub Date : 2022-09-20 DOI: 10.15328/cb1282

A. Adilbekova, Saidulla Faizullayev, W. Kujawski

{"title":"Evaluation of the effectiveness of commercial demulsifiers based on polyoxyalkylated compounds in relation to oil and water emulsions of the Sarybulak oilfield","authors":"A. Adilbekova, Saidulla Faizullayev, W. Kujawski","doi":"10.15328/cb1282","DOIUrl":"https://doi.org/10.15328/cb1282","url":null,"abstract":"Water and oil emulsion formation is a natural process that takes place during oil recovery and processing. Heavy oils of Kazakhstan form highly stable oil emulsions mostly stabilized by a high content of asphaltenes, resins, and other surface-active components. Oil-in-water emulsions initiate the corrosion of equipment and cause transportation issues. Dewatering of oil emulsions is economically reasonable and requires universal techniques which could be applied to any sort of oil. In this study, the chemical composition of crude oil from the Sarybulak oilfield was determined, and commercial demulsifiers of Basorol brand were applied to these water-in-oil emulsions. The natural stabilizers content (asphaltenes and resins) was determined and correlated with IR-spectrum data. Finally, the effectiveness of demulsifiers is compared and explained according to their structures. It has been found that the higher the relative solubility number of the demulsifier, the better water-in-oil emulsion separation efficiency and dewatering mechanism was assumed. Results of water separation showed that Basorol PE-10400 and PE-10500 are the most effective, with DE of 96% and 91%, respectively, for 30% (vol.) water-in-oil emulsion at 60°C during 1-hour treatment.","PeriodicalId":9860,"journal":{"name":"Chemical Bulletin of Kazakh National University","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47686346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis, structure and features of formation of biphasic hybrid polymer compositions based on bentonite 基于膨润土的双相杂化聚合物组合物的合成、结构及形成特征

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Chemical Bulletin of Kazakh National University Pub Date : 2022-09-20 DOI: 10.15328/cb1280

G. Mamytbekov, E. Zhakanbaev, Ernat Nurtazin, Victor Glushenko

{"title":"Synthesis, structure and features of formation of biphasic hybrid polymer compositions based on bentonite","authors":"G. Mamytbekov, E. Zhakanbaev, Ernat Nurtazin, Victor Glushenko","doi":"10.15328/cb1280","DOIUrl":"https://doi.org/10.15328/cb1280","url":null,"abstract":"The synthesis, structure and features of the formation of biphasic hybrid polymer compositions based on natural ionite (bentonite – BT), its intercalated complex (ICC) with a solid solution of copper ferrocyanide K4-хCux[Fe(CN)6] and a synthetic rare cross-linked acrylamide-acrylic acid copolymer were studied. The mechanism of formation of biphasic intercalated and percolated structures was analyzed by means of X-ray diffraction, X-ray fluorescence analysis, IR-Fourier spectroscopy and stress-strain curves. It is shown that the impregnation of the mineral bentonite filler into the polymer matrix, including its intercalated complex {BT:K4-xCux[Fe(CN)6]} is accompanied by an increase of non-uniformity of the structure of the hybrid composite material. It has been established that the main factor characterizing the deformation stability of the composite is the adhesive strength at the interface between the mineral filler and the polymer matrix. Under uniaxial tension of the P[AA-AA]{BT} composition and the percolated complex P[AA-AA]{BT:K4-xCux[Fe(CN)6]} their internal structure is rearranged resulting in stretching of agglomerates of solid fillers along polymer chains, which is determined by the adhesion force between polymer chains and mineral particles at the phase boundary. It is proposed to consider such biphasic hybrid composite materials as a promising class of interpenetrating networks with valuable applied properties.","PeriodicalId":9860,"journal":{"name":"Chemical Bulletin of Kazakh National University","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48546362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of the interaction of components in a nickel-molybdenum catalyst on its activity in decomposition of methane to hydrogen 镍钼催化剂组分相互作用对甲烷分解制氢活性的影响

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Chemical Bulletin of Kazakh National University Pub Date : 2022-09-20 DOI: 10.15328/cb1281

N. Makayeva, G. Yergaziyeva, Moldir Anisova, Z. Shaimerden, K. Dossumov

{"title":"Effect of the interaction of components in a nickel-molybdenum catalyst on its activity in decomposition of methane to hydrogen","authors":"N. Makayeva, G. Yergaziyeva, Moldir Anisova, Z. Shaimerden, K. Dossumov","doi":"10.15328/cb1281","DOIUrl":"https://doi.org/10.15328/cb1281","url":null,"abstract":"This work is devoted to the study of the activity of monometallic (Fe/Al2O3) and bimetallic (Fe-Mo/Al2O3) catalysts supported to carrier γ- Al2O3. It has been discovered that the bimetallic catalyst is more active than the monometallic catalyst in the methane decomposition reaction. The results of the influence of molybdenum oxide on the activity of Fe/Al2O3 catalyst in the methane decomposition reaction in the temperature range 500-850°C have been obtained. It has been determined that the addition of molybdenum oxide in the amount of 5 wt. % of the iron catalyst composition leads to an increase in the catalytic activity of the sample in the reaction of methanedecomposition to hydrogen at relatively low temperatures. Compared to Fe/Al2O3 on the FeMo/Al2O3 catalyst at a reaction temperature of 750°C, methane conversionincreases from 8% to 98%, hydrogen yield from 5% to 57%.\u0000The increased field of activity Fe-Mo/Al2O3catalyst in the decomposition of methane to hydrogen compared to Fe/Al2O3 catalysts is due to an increase in the dispersity of the active phases of the catalyst, as well as the formation of an easily reduced Fe2(MоО4)3 phase, according to XRD, TPR-H2, and BET methods.\u0000","PeriodicalId":9860,"journal":{"name":"Chemical Bulletin of Kazakh National University","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45821596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Removal of Diclofenac-Na from aqueous solution onto H3PO4 modified composite clay H3PO4改性复合粘土去除水中双氯芬酸钠

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Chemical Bulletin of Kazakh National University Pub Date : 2022-09-20 DOI: 10.15328/cb1274

A. Ajani, Ademola Toheeb Adeniji, Samson Shina Ayodabo, A. Alade, T. Afolabi, S. O. Ganiyu

引用次数: 0

Ophthalmic drug delivery system based on the complex of gellan and ofloxacin 以结冷胶与氧氟沙星配合物为基础的眼科给药系统

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Chemical Bulletin of Kazakh National University Pub Date : 2022-06-20 DOI: 10.15328/cb1239

G. Tatykhanova, V. Aseyev, M. Vamvakaki, V. Khutoryanskiy, S. Kudaibergenov

{"title":"Ophthalmic drug delivery system based on the complex of gellan and ofloxacin","authors":"G. Tatykhanova, V. Aseyev, M. Vamvakaki, V. Khutoryanskiy, S. Kudaibergenov","doi":"10.15328/cb1239","DOIUrl":"https://doi.org/10.15328/cb1239","url":null,"abstract":"Complex formation between a natural polysaccharide – gellan and an antimicrobial drug – ofloxacin was studied in aqueous solution. Conductimetric and potentiometric titration curves revealed that gellan and ofloxacin forms a water-soluble complex of composition 2:1 mol/mol stabilized by ionic and hydrogen bonds. The formation of the gellan-ofloxacin complex was confirmed by FTIR spectroscopy, dynamic light scattering, zeta-potential and thermogravimetric analysis. The average hydrodynamic size of the complex was found 307±5 nm and its zeta-potential was negative and equal to -15 mV. Thin films of the gellan-ofloxacin complex, gelled in 0.3 wt.% of CaCl2, were used to study the release kinetics of ofloxacin in distilled water and phosphate buffer. The drug release kinetics evaluated by UV-Vis spectroscopy at λmax = 289 nm and calculated by the Ritger-Peppas model correspond to non-Fickian diffusion in distilled water and Case II transport (zero-order kinetics) in phosphate buffer. The cumulative release of ofloxacin from the gellan-ofloxacin films was equal to 96±2% and 36±2% in phosphate buffer and distilled water, respectively. It is expected that the gellan-ofloxacin complex is able to form in situ gel on the surface of the eye and to prolong the drug residence time in the tear fluid.","PeriodicalId":9860,"journal":{"name":"Chemical Bulletin of Kazakh National University","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44048683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Kinetic parameters of thermal destruction of the copolymer of polyethylene glycol fumarate with acrylic acid in inert medium 聚乙二醇-富马酸酯-丙烯酸共聚物在惰性介质中的热破坏动力学参数

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Chemical Bulletin of Kazakh National University Pub Date : 2022-06-20 DOI: 10.15328/cb1260

M. Burkeev, A. Bolatbay, D. Havlícek, Y. Tazhbayev, S. Davrenbekov, L. Zhaparova

{"title":"Kinetic parameters of thermal destruction of the copolymer of polyethylene glycol fumarate with acrylic acid in inert medium","authors":"M. Burkeev, A. Bolatbay, D. Havlícek, Y. Tazhbayev, S. Davrenbekov, L. Zhaparova","doi":"10.15328/cb1260","DOIUrl":"https://doi.org/10.15328/cb1260","url":null,"abstract":"Thermal decomposition of the copolymer of polyethylene glycol fumarate with acrylic acid (p-EGF:AA) of two different compositions synthesized earlier was studied in the present work. TG and DTG curves prove that decomposition takes place in several stages. According to thermogravimetric curves it has been found out that for the copolymer with higher content of acrylic acid the decomposition of the copolymer’s sample is started at higher temperatures. It has been shown the shift of the temperature of decomposition’s start to the higher area with the increase of heating rate which is necessary for the detorsion of macromolecular coil. Experimental data processed using graphical methods of Kissinger–Akahira–Sunose and Friedman allowed us to calculate the activation energy of the thermal decomposition process. It has been established that the copolymer with the composition of 21.03:78.97 mass.% has lower meaning of activation energy than the one with the composition of 68.96:31.04 mass.%. As a result of calculation one can see that the meanings found out using these methods depend slightly on conversion. Using Achar-Brindley-Sharp method and the method of invariant kinetic parameters the kinetic triplet of the decomposition process has been found which was used to build the calculated curve. The dependences of g(α) on α using these parameters showed a satisfactory agreement of calculated curves with the experimental ones. One can conclude that the decomposition process of the copolymer of polyethylene glycol fumarate with acrylic acid is well described with of D3 (three-dimensional diffusion) model.","PeriodicalId":9860,"journal":{"name":"Chemical Bulletin of Kazakh National University","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44995824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis of 1-propargyl-1-(2-methyl-3-oxo-3-(p-tolyl)propyl)-piperidin-1-ium bromide and its plant growth-stimulating activity assessment 1-丙炔-1-(2-甲基-3-氧-3-(对甲基)丙基)-胡椒碱-1-溴化ium的合成及其植物促生长活性评价

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Chemical Bulletin of Kazakh National University Pub Date : 2022-06-20 DOI: 10.15328/cb1259

Y. Belyankova, A. Dauletbakov, B. Anapiyayev, A. Ten, M. Aydemir, A. Zazybin

{"title":"Synthesis of 1-propargyl-1-(2-methyl-3-oxo-3-(p-tolyl)propyl)-piperidin-1-ium bromide and its plant growth-stimulating activity assessment","authors":"Y. Belyankova, A. Dauletbakov, B. Anapiyayev, A. Ten, M. Aydemir, A. Zazybin","doi":"10.15328/cb1259","DOIUrl":"https://doi.org/10.15328/cb1259","url":null,"abstract":"The aim of this study was to synthesize novel ionic compound – 1-propargyl-1-(2-methyl-3-oxo-3-(p-tolyl)propyl)-piperidin-1-ium bromide – via the N-alkylation (in conventional conditions and using ultrasound activation), and investigate its influence on the plant growth-stimulating activity using of sweet sorghum seeds. The synthesized compound was fully characterized by infrared (IR) and nuclear magnetic resonance (NMR) spectroscopy. Regardless of the type of synthesis’ methods, the isolated yield of the produced ionic compound is showed 79-81%, however, the reaction rate was significantly increased by using ultrasonic activation. For the assessment of the growth-stimulating activity of the synthesized ionic compound, parameters such as root length, shoot length, seed energy germination rate, and germination capacity were determined on 10 genotypes of sweet sorghum seeds. The results of samples with low concentration (0.001% vol. solution) were demonstrated the higher intensity for tested genotypes than control samples, especially for process of gemmogenesis and intensity of rhizogenesis. The results of this study can be used as basis for the further development of plant growth stimulants based on ionic compounds.","PeriodicalId":9860,"journal":{"name":"Chemical Bulletin of Kazakh National University","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48777067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of food processing method on heavy metals 食品加工方法对重金属的影响

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Chemical Bulletin of Kazakh National University Pub Date : 2022-06-20 DOI: 10.15328/cb1247

Alan Diyarov, N. Nursapina, I. Matveyeva, O. Ponomarenko

引用次数: 0

The use of natural zeolite and chamotte clay-based sorbents for the extraction of sodium and potassium ions from saline water: a preliminary study 利用天然沸石和灰泥基吸附剂从盐水中提取钠离子和钾离子的初步研究

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Chemical Bulletin of Kazakh National University Pub Date : 2022-06-20 DOI: 10.15328/cb1276

G. Seilkhanova, A. Rakhym, Anastasiya Kan, A. Kenessova, Y. Mastai

{"title":"The use of natural zeolite and chamotte clay-based sorbents for the extraction of sodium and potassium ions from saline water: \u0000a preliminary study","authors":"G. Seilkhanova, A. Rakhym, Anastasiya Kan, A. Kenessova, Y. Mastai","doi":"10.15328/cb1276","DOIUrl":"https://doi.org/10.15328/cb1276","url":null,"abstract":"In this work, sorbents based on natural zeolite (Z) and chamotte clay (ChC) treated with NaCl and HNO3 solutions were obtained to extract Na+ and K+ ions from saline water. The physicochemical characteristics of the obtained sorbents were studied by SEM, EDAX, and BET methods. It was found that successive treatment with NaCl and HNO3 solutions has a positive effect on the sorption properties of the studied materials. The maximum increase in the specific surface area from 4.5 m2/g to 39.3 m2/g is observed for acid-treated Z, and the specific surface area of ChC also increases almost 2-fold from 8.4 m2/g to 15.3 m2/g. Na+ and K+ ions are extracted from water due to ion exchange with Z and ChC cations. As a result of determining the cation exchange capacity (CEC) of the studied sorbents, it was found that treatment with a NaCl solution improves the ion exchange properties of the sorbent and leads to the formation of a “homoionic” form of aluminosilicates. Due to that the sorbents more easily enter ion exchange reactions. The authors established the sorption activity of the obtained materials based on natural Z and ChC with respect to Na+ and K+ cations. The maximum recovery rate is 28.45% for Na+ ions with the ChC-Na-H sorbent and 76.28% for K+ ions with the ChC-Na sorbent. Among Z-based sorbents, the most effective forms are Z-Na-H (15.44% Na+ recovery) and Z-Na (60.47% K+ recovery).","PeriodicalId":9860,"journal":{"name":"Chemical Bulletin of Kazakh National University","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47358706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0