Chemical Bulletin of Kazakh National University最新文献_第8页

Investigation of the catalуtic activitу of K2CO3 in the carboxуlation reaction of phenol with sodium ethуl carbonate K2CO3在苯酚与碳酸钠羧化反应中的催化活性研究

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Chemical Bulletin of Kazakh National University Pub Date : 2019-05-29 DOI: 10.15328/CB1061

K. A. Suerbaev, K. Shalmagambetov, G. Zhaksylykova, N. Kudaibergenov, M. Kozhakhmet

{"title":"Investigation of the catalуtic activitу of K2CO3 in the carboxуlation reaction of phenol with sodium ethуl carbonate","authors":"K. A. Suerbaev, K. Shalmagambetov, G. Zhaksylykova, N. Kudaibergenov, M. Kozhakhmet","doi":"10.15328/CB1061","DOIUrl":"https://doi.org/10.15328/CB1061","url":null,"abstract":"The catalуtic activitу of К2СО3 in the carboxуlation reaction of phenol with sodium ethуl carbonate has been investigated. The aim of the research was to develop a new efficient method for producing salicylic acid which is widely used in pharmaceuticals and other type preparations, also used in agriculture as an effective plant growth promoter. The most widespread synthesis method of salicylic acid is the Kolbe-Schmitt of phenol carboxylation, but it has a number of serious disadvantages. One of the alternative methods is the use of alkali metal salts of mono ethers of the carbonic acids as carboxylating agents in the carboxylation of phenol. In order to improve the method of production of salicylic acid, the catalytic activity of the К2СО3 catalyst at the carboxylation of phenol with sodium ethyl carbonate was studied for the first time. The effect of the process parameters (temperature, pressure, reaction time, ratio of catalyst to carboxylating agent) on the yield of the target product was studied. It was found optimal conditions: T=160°C, PCO2=10 atm, τ=7(4+3) h, [К2СО3]:[SEC]=0.07:1 at which the yield of the target product was 80%. The yields of the target product at phenol carboxylation with sodium ethyl carbonate in the presence and without K2CO3 were determined. It was found that К2СО3 shows the catalytic activity during carboxylation reaction.","PeriodicalId":9860,"journal":{"name":"Chemical Bulletin of Kazakh National University","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49475356","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

The study of fly ash filler behaviour in the polymer matrix of polyethyleneterephthalate 粉煤灰填料在聚对苯二甲酸乙二酯聚合物基体中的性能研究

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Chemical Bulletin of Kazakh National University Pub Date : 2019-03-29 DOI: 10.15328/CB1018

T. Ketegenov, N. Khan, O. Tyumentseva, A. Karagulanova

引用次数: 0

Concentration of uranium isotopes by in-situ coprecipitation on activated coal and iron (III) hydroxide 活化煤与氢氧化铁原位共沉淀法测定铀同位素浓度

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Chemical Bulletin of Kazakh National University Pub Date : 2019-03-29 DOI: 10.15328/cb1000

I. Matveyeva, Fatima S. Meiirman, N. Nursapina, B. Satybaldiyev, T. Tuzova, Zh. Shalabayev, B. Shynybek

{"title":"Concentration of uranium isotopes by in-situ coprecipitation on activated coal and iron (III) hydroxide","authors":"I. Matveyeva, Fatima S. Meiirman, N. Nursapina, B. Satybaldiyev, T. Tuzova, Zh. Shalabayev, B. Shynybek","doi":"10.15328/cb1000","DOIUrl":"https://doi.org/10.15328/cb1000","url":null,"abstract":"The use of the method of nonequilibrium uranium in various branches of science led to the necessity to determine its isotopic composition. The content of uranium isotopes in natural waters is often extremely low, therefore, it is necessary to collect significant volumes of samples in order to obtain reliable results of analysis. In this paper, it is proposed to concentrate uranium isotopes from water in-situ. Two alternative methods of uranium coprecipitation in field conditions (on activated carbon and iron (III) hydroxide) are considered. The desorbed uranium isotopes are determined by an alpha-spectrometric method with preliminary radiochemical preparation in laboratory conditions, including extraction with tributyl phosphate and electrodeposition on a steel disc. It was found that when concentrating on activated carbon the chemical yield was from 2 to 32%, and when concentrating on iron (III) hydroxide it is from 15 to 62%. For the second case, the chemical yield is acceptable for radiochemical work, and the proposed method for concentrating of uranium isotopes is recommended for usage in field conditions. Approbation of the method was carried out within the framework of the PEER454 project in 2017 in the valley of the river Ziddy, Pamir-Alay, Republic of Tajikistan. Work in the field conditions showed high efficiency of the method and its full feasibility even in the absence of acceptable laboratory conditions.","PeriodicalId":9860,"journal":{"name":"Chemical Bulletin of Kazakh National University","volume":"1 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67384884","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

The effect of mechanochemical activation and γ-radiation to a depth of coal catalytic hydrogenation of deposit Mamyt 机械化学活化和γ辐射对煤催化加氢深度的影响

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Chemical Bulletin of Kazakh National University Pub Date : 2019-03-29 DOI: 10.15328/CB1041

Z. Kairbekov, S. Suimbayeva, I. Jeldybayeva, Murtezaoglu Kirali, Yelmira Yermoldina

{"title":"The effect of mechanochemical activation and γ-radiation to a depth of coal catalytic hydrogenation of deposit Mamyt","authors":"Z. Kairbekov, S. Suimbayeva, I. Jeldybayeva, Murtezaoglu Kirali, Yelmira Yermoldina","doi":"10.15328/CB1041","DOIUrl":"https://doi.org/10.15328/CB1041","url":null,"abstract":"This article presents the results of the mechanochemical activation of coal in a shock-grinding-type mill and the γ-radiation effect of a stream of electrons at the LU-6 electron accelerator. It was established that during the hydrogenation of dispersed coal, the yield of both total liquid products and coal distillates of various fractional composition increases. The maximum yield of liquid products (69.2 wt.%), gasoline (13.9 wt.%) and diesel (18.7 wt.%) fractions was observed during the hydrogenation of crushed coal for 30 min. It has been shown that the irradiation of coal with an electron flow (an irradiation dose of 150 kGy) also increases its reactivity in the process of hydrogenation, and also promotes the formation of free radicals and changes in iron compounds that make up the coal hydrogenation catalyst based on natural bauxite from the Turgai deposit. The non-linear regression method established the functional dependence of the yield of liquid products on the radiation dose, on the time of mechanical activation and on the concentration of free radicals, which are of an extreme nature.","PeriodicalId":9860,"journal":{"name":"Chemical Bulletin of Kazakh National University","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44684854","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

Sorption of lead and cadmium ions from aqueous solutions using modified zeolite 改性沸石对水溶液中铅和镉离子的吸附

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Chemical Bulletin of Kazakh National University Pub Date : 2018-12-28 DOI: 10.15328/cb980

M. Telkhozhayeva, G. Seilkhanova, A. Rakhym, A. Imangaliyeva, D. Akbayeva

{"title":"Sorption of lead and cadmium ions from aqueous solutions using modified zeolite","authors":"M. Telkhozhayeva, G. Seilkhanova, A. Rakhym, A. Imangaliyeva, D. Akbayeva","doi":"10.15328/cb980","DOIUrl":"https://doi.org/10.15328/cb980","url":null,"abstract":"The processes of lead and cadmium ions sorption by modified zeolite of Chankanai deposit were studied. Chitosan was used as a surface modifier due to its properties: nontoxicity, biodegradability and biocompatibility. The adsorption process was carried out at room temperature (295 K) and pH 7 under static conditions. The synthesized sorbent has been characterized by scanning electron microscopy (SEM), elemental analysis; the concentrations of Pb(II) and Cd(II) ions before and after adsorption were determined using atomic absorption spectroscopy (AAS). The Si/Al ratio of the zeolite was found to be 1.66, which showed the prospects of using this material as a source object. The static exchange capacity (SEC) of sorbents and the extraction degree of heavy metal ions were determined and compared. It was found that the removal of heavy metal ions increased with the increase of contact time (removal efficiency was 99.1±1.2% for Pb2+ and 83.4±1.2% for Cd2+). The adsorption capacity values of the modified zeolite for metal ions were (0.86±0.03) mg/g for Cd(II) and (0.68±0.03) mg/g for Pb(II). Chitosan-modified zeolite proved to be an effective adsorbent for removal of lead and cadmium ions from aqueous solutions.","PeriodicalId":9860,"journal":{"name":"Chemical Bulletin of Kazakh National University","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2018-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44591861","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: 3

Synthesis and identification of 3,5-bis(hydroxymethyl)tetrahydro-4H-pyran-4-one 3,5-双（羟甲基）四氢-4H-吡喃-4-酮的合成与鉴定

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Chemical Bulletin of Kazakh National University Pub Date : 2018-12-28 DOI: 10.15328/CB1039

K. Bazhykova, P. Langer, E. Yergaliyeva, Tulegen M. Seylkhanov, Z. Abilov

{"title":"Synthesis and identification of 3,5-bis(hydroxymethyl)tetrahydro-4H-pyran-4-one","authors":"K. Bazhykova, P. Langer, E. Yergaliyeva, Tulegen M. Seylkhanov, Z. Abilov","doi":"10.15328/CB1039","DOIUrl":"https://doi.org/10.15328/CB1039","url":null,"abstract":"3,5-bis(hydroxymethyl)tetrahydro-4H-pyran-4-one by condensation of acetone with formaldehyde in the ratio of 1:4 in an alkaline medium at a temperature of 30-35°С (product yield 67.4%) was obtained. To determine the composition of obtained compound elemental analysis was used. Functional composition and structural elements were identified using IR spectroscopy. To prove the structure of the synthesized compound, 1H and 13C NMR spectra were taken on a JNN-ECA Jeol 400 spectrometer (at a frequency of 399.78 MHz and 100.53 MHz) with a CDCl3 solvent. Quantum-chemical calculations of stable conformations of 3,5-bis(hydroxymethyl)tetrahydro-4H-pyran-4-one was performed using ab initio DFT B3LYP method and 6-31G (d) and 6-311+G(3df,2p) basis sets. It was found that the stable conformers obtained by calculations are in the \"chair\" conformation; the hydroxymethyl substituents in conformer I are located equatorially, in conformation II – axially and equatorially, in conformation III – axially. In the conformer III, as a result of spatial proximity, hydroxymethyl substituents form an intramolecular hydrogen bond. The total energies and dipole moments were calculated; a lower value of the dipole moment of the conformation II may indicate its preference over the others.","PeriodicalId":9860,"journal":{"name":"Chemical Bulletin of Kazakh National University","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2018-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46582031","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: 2

Исследование эксплуатационных характеристик дорожного битума, модифицированного отходами полиэтилена 聚乙烯废物改良沥青路性能研究

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Chemical Bulletin of Kazakh National University Pub Date : 2018-12-28 DOI: 10.15328/cb1028

S. S. Satayeva, Aibarsha G. Аbdrakhmanova, Anar S. Kurmangaliyeva

引用次数: 1

Study of effectiveness of strongly basic anion exchange resins in the process of uranium extraction from the underground leaching productive solution 强碱性阴离子交换树脂在地下浸出生产液提铀过程中的有效性研究

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Chemical Bulletin of Kazakh National University Pub Date : 2018-12-28 DOI: 10.15328/CB979

N. Nursapina, Fatima S. Meiirman, G. Amanova, I. Matveyeva

引用次数: 1

Self-propagating high-temperature synthesis of refractory powder materials based on zirconium diboride obtained from boron-containing mineral raw materials of the Republic of Kazakhstan 以哈萨克斯坦含硼矿物原料为原料制备的二硼化锆耐火粉末材料的自蔓延高温合成

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Chemical Bulletin of Kazakh National University Pub Date : 2018-09-29 DOI: 10.15328/cb982

A. Batkal, Gulnaz K. Temirlanova, Elaman M. Satybaldiyev, Aizhan Zh. Seydualieva, R. Abdulkarimova

引用次数: 1

Hydrothermal synthesis of monostructured LaPO4: morphology and structure 单结构LaPO4的水热合成:形貌和结构

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Chemical Bulletin of Kazakh National University Pub Date : 2018-09-29 DOI: 10.15328/cb1015

K. Kenges, M. Aldabergenov, O. Proskurina, V. Gusarov

{"title":"Hydrothermal synthesis of monostructured LaPO4: morphology and structure","authors":"K. Kenges, M. Aldabergenov, O. Proskurina, V. Gusarov","doi":"10.15328/cb1015","DOIUrl":"https://doi.org/10.15328/cb1015","url":null,"abstract":"The application field of materials based on lanthanum orthophosphate (LaPO4) including nanomaterials, has been permanently extending recently. The high level of mechanical properties and the compatibility with numerous oxides make it possible to consider the possibility of using lanthanum orthophosphate as a composite material for construction purposes. This application is particularly promising when nanoparticles with quasi-1D morphology (nanorods) are used. The high isomorphic capacity of the LaPO4-based phase for alkaline-earth ions and ions of lanthanides and actinides, high chemical stability, and high radiation hardness make promising the application of this compound as a matrix for immobilization of radioactive wastes. \u0000The possibility of obtaining lanthanum phosphate (LaPO4) by the hydrothermal method is considered in the work. Effects of pH, temperature and time of processing of hydrothermal synthesis on the morphology and structure of monostructured lanthanum phosphate are studied. It has been established that, with the increase of pH, the morphology of phosphate changed, the size of the crystallites increased, while the crystal structure changed from hexagonal to monoclinic.\u0000","PeriodicalId":9860,"journal":{"name":"Chemical Bulletin of Kazakh National University","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2018-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44572504","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: 1