Электронный каталог

36
K85
Kruchinin, A. G.
    Baromembrane technologies as a prospective alternative to vacuum evaporation in the dry milk production. [Текст] / A. G. Kruchinin, E. E. Illarionova, A. V. Bigaeva, S. N. Turovskaya // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №1. - P. 133-138
ББК 36

Рубрики: Пищевые производства

Кл.слова (ненормированные):
membrane technologies -- baromembrane method -- milk powder -- quality -- cheese suitability -- eat resistance -- solubility
Аннотация: In the dairy industry, in recent years, baromembrane technologies (microfiltration, ultrafiltration, nanofiltration, reverse osmosis) have become increasingly widespread, which make it possible to obtain milk raw materials that are safe from a microbiological point of view and to standardize the protein mass fraction, concentration and fractionation of milk constituents. These filtration methods are definitely an alternative to traditional manufacturing processes. They are integrated into many production steps for a wide range of whole milk products, cottage cheese, cheese, etc.
Держатели документа:
WKU
Доп.точки доступа:
Illarionova, E. E.
Bigaeva, A. V.
Turovskaya, S. N.

24
A99
Azimbayeva, G. E.
    Gas Chromatographic analysis of the chemical composition of ethyl alcohol obtained from plants of the genus asteraceae. [Текст] / G. E. Azimbayeva // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №2. - P. 6-13
ББК 24

Рубрики: chemistry

Кл.слова (ненормированные):
Ethyl alcohol -- plants of the genus Asteraceae -- gas chromatographic method -- chromatogram -- chemical composition
Аннотация: The article discusses the methods of obtaining and application of ethyl alcohol. The results of the analysis of the chemical composition of ethyl alcohol obtained from plants of the genus Asteraceae are presented. As a result of the study, alcohols were obtained in different concentrations. The chemical composition of ethyl alcohol was determined by gas chromatography. The impurity composition of ethyl alcohol obtained from various types of raw materials is also shown.
Держатели документа:
WKU
Доп.точки доступа:
Kamysbayeva, A.K.
Bakibaev, Abdigali

35
B15
Bagova, Z.
    Analysis and prospective utilization of technogenic slag waste from a lead plant. [Текст] / Z. Bagova, K. Zhantasov, G. Turebekova, B. Sapargaliyeva, Javier Rodrigo-Iiarri // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №2. - P. 22-28
ББК 35

Рубрики: chemical Technology

Кл.слова (ненормированные):
waste -- lead-zinc waste -- secondary raw materials -- non-ferrous metals -- valuable components -- waste processing -- waste disposal -- low-waste and non-waste technologies
Аннотация: The article presents the analysis and results of the study of technogenic slag waste of lead-zinc production. Slags of lead-zinc production contain a large number of toxic compounds: lead, zinc, osmium, cadmium, which are dangerous sources of environmental pollution. Due to the open storage of slags, it was found that the maximum permissible concentrations of lead were exceeded. Utilization of man-made slag waste is of great importance for reducing the negative impact on the safety of life and improving the environmental situation in the region. At the same time, slags are valuable raw materials containing compounds of non-ferrous and rare-earth metals.
Держатели документа:
WKU
Доп.точки доступа:
Zhantasov, K.
Turebekova, G.
Sapargaliyeva, B.
Rodrigo-Iiarri, Javier

35
D99
Dzhumadullaeva, S. A.
    The kinetics of selective hydrazinolysis of maleic acid on the acid catalyst. [Текст] / S. A. Dzhumadullaeva, A. B. Bayeshov, A. V. Kolesnikov // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №2. - P. 53-57
ББК 35

Рубрики: chemical Technology

Кл.слова (ненормированные):
maleic acid -- hydrazinolysis -- hydrazide -- catalyst
Аннотация: For the first time, kinetics and the mechanism of the reaction of hydrazinolysis of maleic acid in the presence of cation exchanger resin KU-2-8 in H-form have been studied. The experiments were carried out in a static system in a thermostat glass reactor. It was found that cation exchanger shows high catalytic activity in the studied process - maleic acid conversion was 93%, and maleic hydrazide yield was 90%. The conversion selectivity of maleic acid to maleic hydrazide was 97,8%. The reaction rate was determined from the accumulation of maleic hydrazide. The apparent reaction rate constant (k) was calculated from the second-order reaction rate equation. The effect of initial concentrations of maleic acid and hydrazine hydrate, the temperature on the reaction rate was studied. The first order of maleic acid and hydrazine hydrate is determined. Activation energy of the process found from the Arrhenius dependence is 32,1 kJ/mol. On the basis of kinetic and IR spectroscopic methods, a probable reaction mechanism involving polymer-bound hydrogen ions is proposed.
Держатели документа:
WKU
Доп.точки доступа:
Bayeshov, A.B.
Kolesnikov, A.V.

35
A92
Augaliev, D. B.
    Oxidative dimerization of methane to C2 hydrocarbons. [Текст] / D. B. Augaliev, M. K. Erkibaeva, A. O. Aidarova // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №3. - P. 18-24
ББК 35

Рубрики: chemical Technology

Кл.слова (ненормированные):
ODM reaction -- C2 hydrocarbons -- SHS method -- temperature of reaction
Аннотация: The purpose of this work is to study the reaction of methane dehydrogenation on new 20%La-10%Ce-20%Mg-50% glycine catalysts prepared by the SHS method to identify the optimal conditions for their preparation, concentration and ratio of metals, the influence of contact time and process temperature on the direction and mechanism of the reaction.
Держатели документа:
WKU
Доп.точки доступа:
Erkibaeva, M.K.
Aidarova, A.O.
Tungatarova, S.А.
Baizhumanova, T.S.

24
M97
Mussina, А. S.
    Development of the conditions for strong thallium amalgam. [Текст] / А. S. Mussina // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №3. - P. 65-70
ББК 24

Рубрики: chemistry

Кл.слова (ненормированные):
thallium amalgam -- chemical preparation -- storage -- decomposition -- sulfuric acid -- water -- wash liquid
Аннотация: It has been established that lNH2SO4 solution and distilled water can be used as a protective medium for a long-term storage (30-40 days) of thallium amalgam of eutectic composition (8.6 mas.%), without sliming of its surface and an insignificant change of its concentration. An inverse dependence between the decomposition reaction rate and the ratio of the solution volume per unit of the contact surface (V:S), which corresponds to the height of the liquid layer (h) above the amalgam, is observed. At h ~ 2.5 cm and higher, the reaction rate becomes stabilized. The value of metal loss during its storage for 10-15 days does not exceed 0.5-1.0 mas.% of the initial thallium content in the amalgam. It has been shown that the rate of dissolution of thallium from amalgam is rather low, and in sulfuric acid solution it is only slightly higher than that in water with all S:V ratios. A similar picture is observed upon thallium amalgam decomposition in the same media in an open vessel; the difference consists only in a higher K value (Table 4). Thus, with S:V = 1:2.5, in an open vessel K in lNH2SO4 makes up 10,5.1011 mol/cm2.sec, and in H2O – 7.3.1011 mol/cm2.sec, whereas in a closed vessel K in lNH2SO4 makes up 1,9.1011 mol/cm2.sec, and in H2O – 1.5.1011 mol/cm2.sec. For 40 days of thallium amalgam (8.54 mas.%) storage in 1NH2SO4 the loss of thallium has been 1.3 mas.%, and in the distilled water - 1 mas.%. The quantity of the dissolved metal increases in proportion to the experiment duration, which is characteristic for a zero-order reaction, and this dependence is observed for all S:V ratios from 1:1 to 1:7. Besides, a possibility to use some saturated hydrocarbons, wherein no sliming of thallium amalgam occurs, as a protective wash liquid has been shown.
Держатели документа:
WKU
Доп.точки доступа:
Baitasheva, G.U.
Myrzakhmetova, N.О.
Tagabergenova, Zh.A.
Gorbulicheva , E.P.

24
N94
Nurdillayeva, R. N.
    Dissolution of stanless steel in sodium chloride solution at polarization by non-stationary current. [Текст] / R. N. Nurdillayeva // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №3. - P. 75-81
ББК 24

Рубрики: chemistry

Кл.слова (ненормированные):
stainless steel -- titanium electrode -- alternating current -- iron (II) ions -- chromium (III)ions -- current density -- and current efficiency
Аннотация: Stainless steel is in great demand due to its mechanical strength, heat resistance, and resistance to corrosive environments. This article presents the result of a study of the electrochemical dissolution behavior of a stainless steel electrode (12X18H10T) at polarization by 50 Hz alternating current in a neutral medium (NaCl). Preliminary experiments have shown that the main processes do not take place when two stainless steel electrodes are polarized with an alternating current. It was observed that by the polarization of the “stainless steel – titanium” pair electrodes with alternating current, the alloy is intensively dissolved with the formation of iron (II) and chromium (III) ions. This is due to the "valve" properties of the oxide layer formed on the surface of the titanium electrode. A change in the value of the current density of the titanium and steel electrodes significantly affects the process of electrochemical dissolution of the alloy. At high current densities, the dissolution rate of the alloy decreases due to the deterioration of the current correcting properties of titanium. With an increase in the electrolyte concentration, the current efficiency is reduced as salt passivation occurs. A maximum value of the current efficiency of dissolution of stainless steel was observed at a current frequency of 50 Hz. High frequencies of the alternating current do not provide an adjustable duration of the anodic half-cycle for the oxidation reaction due to the frequent change of half-cycles of the alternating current. It was observed that increasing the temperature of the electrolyte reduces the current efficiency of the electrochemical dissolution of stainless steel electrodes. The effects of main electrochemical parameters on the electrolysis process have been investigated, and the optimal conditions of the alloy dissolution were established (іТі = 60 kA/m2, іSS = 800 A/m2, [NaCl] = 2.0 M, t = 30, ν = 50 Hz.).
Держатели документа:
WKU
Доп.точки доступа:
Sauirbay, Zh.G.
Bayeshov, A.B.

35
M23
Mammedov, K.
    Application of new corrosion inhibitor foroilfield equipment and pipelines for improving the ecological security. [Текст] / K. Mammedov // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №4. - P. 32-39
ББК 35

Рубрики: chemical Technology

Кл.слова (ненормированные):
environment -- complex reagent -- pipeline -- aggressive environment -- corrosion -- cavitation -- viscosity -- paraffin deposition
Аннотация: n addition, to increase the viscosity reduction efficiency of the obtained reagent, the mechanism of complex application of the cavitation process and the reagent was described based on the positive results of the experiments. Also, the results of tests via "cold finger" method showed that new reagent has 53% efficiency in paraffin deposition inhibiting at its optimal anti-corrosion concentration (500 mg /l).As a result of the conducted field tests, it was revealed that theuse of the new multifunctional reagent ensures the continuous operation of pipeline network and reliable environmental protection.
Держатели документа:
WKU
Доп.точки доступа:
Aliyev , S.
Nurullayev, V.