Реферат: There was studied protonation of aminothiazoles of mineral acids of different strength in order to research the basicity of nitrogen atoms of free amino group and nitrogen of thiazole ring. The results obtained showed high ambidentity of 2-amino-4-phenylthiazole and 2-amino-4-oxothiazole associated with a high degree of delocalization of both the lone pair of electrons of the amino group and the thiazole ring nitrogen atom which creates opportunities for chemical modification of the aminoheterocycles with the free amino group and the ring nitrogen atom. Сomplexing ability of 2-amino-4-oxothiazole with cobalt (II) chloride caused by high degree of basicity of cyclic nitrogen atom was also studied.
Hydrogenation of p-nitrophenol by gold nanoparticles immobilized within macroporous amphoteric cryogel based on N,N-dimethylaminoethylmethacrylate and methacrylic acid
Автор(ы): Klivenko A. N.*Tatykhanova G. S.*Nuraje N.*Kudaibergenov S. E.*
Реферат: Macroporous amphoteric cryogel based on N,N-dimethylaminoethylmethacrylate and methacrylic acid (DMAEM-MAA) was used for immobilization of gold nanoparticles (AuNPs). The structure of AuNPs immobilized within macroporous amphoteric cryogel represents the triangular, hexagonal, spherical and rod-like species the sizes of which are varied from 3 to 10 ?m. Amphoteric cryogel with immobilized AuNPs was tested as flow-through catalytic reactor in reduction of 4-nitrophenol by NaBH(4).
Complexing ability of 2,8,14,20-tetrabenzol-sulfo-calix[4]resorcenarene in relation to Cs{+}, Рd{2+}, Се{3+}, Eu{3+} ions in aqueous solution
Автор(ы): Amerkhanova Sh. K.*Yamin B. M.*Lazim A. M.*Uali A. S.*Nurgalieva M.*
Реферат: The stability constants of complexes formed in a result of interaction host-guest of water-soluble calix[4]resorcinarene with metal ions (Cs{+}, Pd{2+}, Ce{3+}, Eu{3+}) in ratio 1:1 and thermodynamic parameters of their formation were calculated. The dependence of the Gibbs energy change of formation of complexes on the atomic number of the element was constructed. It is shown that the value of stability constants depends on the degree of deprotonation of the rim of the calix[4]resorcinarene. It is found that the guest-cations - Ce{3+}and Eu{3+} are characterized by high charge density, whereby they form the complexes which are relatively strong, and more hydrated.
Thermodynamic parameters of reactions of basic copper carbonates formation with participation of organic complexing agents
Автор(ы): Fomin V. N.*Rozhkovoy I. E.*Gogol D. B.*Ponomarev D. L.*
Реферат: In the article some of thermodynamic parameters for the processes which are possible in nature during the formation of the malachite and azurite are described. The authors have shown that the formation of basic carbonates from copper sulfide ores is thermodynamically more favorable than that from its oxide minerals. The presence of complexing agents promote the dissolution of oxide forms of copper and involve its ions into secondary mineralogenesis. It is found that the hydroxy acids largely promote the formation of a malachite and azurite than the similar amino acids.
Evaluation of interrelation of electrochemical properties and thermal storage capacity of the melt of crystal hydrates of inorganic substances on the basis of Na(2)S(2)O(3)5H(2)O
Автор(ы): Amerkhanova Sh. K.*Shlyapov R. M.*Uali A. S.*
Объем документа: С. 27-33
МРНТИ: 31.15.25*
Ключевые слова: свойства хранения тепла*тиосульфат пентагидрат натрия*электрическая проводимость*удельная плавления*высокая температура*кинетические характеристики*теллуритно натрия*
Реферат: Research of conductivity of concentrated salt solutions are of great interest in connection with the structural changes in electrolytes. The heat storage properties of the mixture of sodium thiosulfate pentahydrate and sodium tellurate dihydrate were calculated. Firstly the coefficients of temperature dependence of heat capacity of sodium tellurate were calculated. Melting temperature of mixtures at ratios (50:1, 25:1, 10:1), which are equal to 349 K, 307 K, 326 K, were determined. The specific melting heat of mixtures was calculated. It was shown, that heat of fusion of mixture Na(2)S(2)O(3)?5H(2)O - Na(2)TeO(4)?2H(2)O (10:1) is maximal and equals to 238.5 kJ?kg{-1}. An analysis of the temperature dependence of the electrical conductivity was carried out. It showed the presence of high activity and mobility of tellurate-ions. It was shown that crystallization process is changed from quasi-equilibrium to the explosive at low temperatures ranging from T=318 K.
Study of the influence of inorganic and organic additives on the possibility and regularity of the precipitation process of brushite from aqueous solutions
Реферат: The article presents a range of issues related to the peculiarities of brushite crystallization in the presence of additives based on thermodynamic calculations and experimental data. The authors studied the regularities of phase formation in the system of Ca{2+} - HPO(4) {2-} - H(2)O, an additive in a broad range of variation of concentrations of components and pH. The effect of silicate-, fluoride-, chloride- and hydrocarbonate-ions on the precipitation and the composition of the crystallizing phase was investigated. It was found that brushite and other calcium phosphates co-precipitate from the original system. Studying the influence of organic additives, it has been established that their presence leads to the precipitation of brushite admixed with apatite phase.
Comparative analysis of arsenates, antimonates and calcium bismuthates based on E-pH diagrams
Автор(ы): Omarov Kh. B.*Absat Z. B.*Aldabergenova S. K.*Rakhimzhanova N. J.*Siyazova A. B.*
Реферат: The article presents the potential-pH diagram systems Ca-As-H(2)O, Ca-Sb-H(2)O, Ca-Bi-H(2)O and the analysis of these systems. The stability region is shown for the followings: Ca(3)(AsO(4))(2), Ca(3)(AsO(4))(2)(4)H(2)O, Ca(AsO(2))(2), Ca(SbO(3))(2), Ca(2)Sb(2)O(7), Ca(3)(SbO(4))(2), Ca(5)Bi(14)O(26), Ca(2)Bi(2)O(5), CaBi(2)O(4) in oxidizing, recovering and aquatic environments. The data obtained can be used in predicting the occurrence of hydrometallurgical processes, due to the fact that the E-pH diagram characterizes the behavior of ions in solutions of the compounds.
Углерод-металлические катализаторы для получения целевых продуктов из синтез-газа
Автор(ы): Токпаев Р. Р.*Абдуллаева С. А.*Атчабарова А. А.*Кабулов А. Т.*Кишибаев К. К.*Нечипуренко С. В.*Ефремов С. А.*Наурызбаев М. К.*
Реферат: В статье получены новые углеродсодержащие носители на основе обогащенных шунгитовых пород и карбонизатов растительного сырья. Исследованы основные физико-химические характеристики носителей, по результатам которых установлено, что лучшими характеристиками обладает носитель на основе карбонизата абрикосовых косточек: удельная поверхность - 480,0 м/г, рН водной вытяжки - 9,4, йодное число - 78,6 мг/г, влажность - 1,1 %, зольность - 3,2 %. На основе разработанных носителей методом пропитки с упариванием раствора получены родий-углеродные катализаторы, которые были испытаны в реакциях получения спиртов из синтез-газа. Использование катализаторов позволило получить метанол и этанол с выходом 56,32 и 43,76 %.
Изучение физико-химических характеристик глин Западного Казахстана
Автор(ы): Бурахта В. А.*Сафина А. В.*
Объем документа: С. 61-65
МРНТИ: 61.31*
Ключевые слова: глинистые породы*физико-химические свойства глин*сорбция*вода*водонефтяные эмульсии*
Реферат: В статье изучены физико-химические, структурные и сорбционные свойства глин Западного Казахстана. Установлено, что среди исследуемых глин глины Погодаевского месторождения обладают лучшими сорбционными характеристиками. Выявлено, что после обогащения и термической обработки глин их сорбционная способность увеличивается. Полученные результаты позволяют сделать вывод о целесообразности использования данных глин в качестве сорбентов в технологии обезвоживания эмульсий.
Processing of Shubarkol coal for obtaining chemical products
Автор(ы): Mamrayeva K. M.*Shashchanova R. B.*Shashchanova M. B.*
Реферат: In the sour coal contain till 35-45 % (on working weight) of gumin of acids, that allows to consider these westers as raw material for reception of chemical substances. As a result of chemical processing sooting coal receive the valuable import-replaced products, which can be used as fertilizer in an agriculture, stabilizers of chisel clay solutions at deep drilling, collectors extending waste water of ions of heavy metals (coop, zinc, lead, mercury).