База данных: Статьи
Страница 1, Результатов: 9
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1.
Подробнее
24
З 19
Dissolution behavior of brass polarized by alternating current in sodium phosphate aqueous solution [Текст] = Закономерности растворения латуни в водном растворе фосфата натрия при поляризации переменным током / R.N. Nurdillayeva [et al.] // Известия НАН РК. Серия химии и технологии. - 2019. - №3. - С. 77-83
ББК 24
Рубрики: Химические науки
Кл.слова (ненормированные):
латунь -- переменный ток -- электролиз -- фосфат натрия -- титановый электрод -- химия
Аннотация: Впервые исследовано электрохимическое поведение сплава Cu-Zn - латуни при поляризации переменным током промышленной частоты в водном растворе фосфата натрия. Рассмотрено влияние плотности тока на латунном электроде (200-1200 А/м2 ) и титановом электроде (20-120 кА/м2 ), концентрации раствора фосфата натрия (0,5-2,0 М), частоты переменного тока (30-150 Гц) и продолжительности электролиза (0,25-1,5 час) на выход по току (ВТ) растворения сплава. Впервые показано, что при переменнотоковом режиме электролиза происходит интенсивное растворение сплава с образованием ионов меди (II) и цинка (II). При электролизе с постоянным током значение ВТ электрохимического растворения сплава было значительно ниже. При повышении плотности тока на латунном электроде, поляризованном переменным током, выход по току растворения сплава плавно снижается и при оптимальных условиях (400 А/м2 ) значение ВТ составило 80%. При изменении плотности тока на титановом электроде ВТ растворения сплава проходит через максимум и ВТ образования ионов Cu (ІІ) и Zn (ІІ) составляет, соответственно, 50% и 30% при плотности тока 60 кА/м2 . Максимальное значение ВТ растворения латуни наблюдалось при 1,0 М концентрации раствора фосфата натрия. Установлено, что при увеличении продолжительности электролиза и частоты переменного тока значение ВТ латуни снижается. На основе полученных результатов была показана вожможность синтеза фосфатов меди и цинка.
Держатели документа:
ЗКГУ
Доп.точки доступа:
Nurdillayeva, R.N.
Bayeshov, A.B.
Sunatullayeva, L.A.
Zhylysbayeva, G.N.
З 19
Dissolution behavior of brass polarized by alternating current in sodium phosphate aqueous solution [Текст] = Закономерности растворения латуни в водном растворе фосфата натрия при поляризации переменным током / R.N. Nurdillayeva [et al.] // Известия НАН РК. Серия химии и технологии. - 2019. - №3. - С. 77-83
Рубрики: Химические науки
Кл.слова (ненормированные):
латунь -- переменный ток -- электролиз -- фосфат натрия -- титановый электрод -- химия
Аннотация: Впервые исследовано электрохимическое поведение сплава Cu-Zn - латуни при поляризации переменным током промышленной частоты в водном растворе фосфата натрия. Рассмотрено влияние плотности тока на латунном электроде (200-1200 А/м2 ) и титановом электроде (20-120 кА/м2 ), концентрации раствора фосфата натрия (0,5-2,0 М), частоты переменного тока (30-150 Гц) и продолжительности электролиза (0,25-1,5 час) на выход по току (ВТ) растворения сплава. Впервые показано, что при переменнотоковом режиме электролиза происходит интенсивное растворение сплава с образованием ионов меди (II) и цинка (II). При электролизе с постоянным током значение ВТ электрохимического растворения сплава было значительно ниже. При повышении плотности тока на латунном электроде, поляризованном переменным током, выход по току растворения сплава плавно снижается и при оптимальных условиях (400 А/м2 ) значение ВТ составило 80%. При изменении плотности тока на титановом электроде ВТ растворения сплава проходит через максимум и ВТ образования ионов Cu (ІІ) и Zn (ІІ) составляет, соответственно, 50% и 30% при плотности тока 60 кА/м2 . Максимальное значение ВТ растворения латуни наблюдалось при 1,0 М концентрации раствора фосфата натрия. Установлено, что при увеличении продолжительности электролиза и частоты переменного тока значение ВТ латуни снижается. На основе полученных результатов была показана вожможность синтеза фосфатов меди и цинка.
Держатели документа:
ЗКГУ
Доп.точки доступа:
Nurdillayeva, R.N.
Bayeshov, A.B.
Sunatullayeva, L.A.
Zhylysbayeva, G.N.
2.
Подробнее
24
Б 82
Borisov, I. M.
Constant of electrolytic dissociation of lithium, sodium and potassium sulphates in aqueous ethanol solutions [Текст] / I. M. Borisov, A. A. Nabiev // Известия высших учебных заведений . - 2020. - №2. - P. 26-31. - (Серия химия и химическая технология)
ББК 24
Кл.слова (ненормированные):
водно-этанольные растворы сульфатов лития -- водно-этанольные растворы сульфатов натрия -- водно-этанольные растворы сульфатов калия -- кондуктометрия -- константы электролитической диссоциации -- электролиты -- молярная электропроводность
Аннотация: Кондуктометрическим методом определены константы электролитической диссоциации сульфатов лития, натрия и калия в водно-этанольных растворах при 25°С.
Держатели документа:
ЗКГУ
Доп.точки доступа:
Nabiev, A.A.
Б 82
Borisov, I. M.
Constant of electrolytic dissociation of lithium, sodium and potassium sulphates in aqueous ethanol solutions [Текст] / I. M. Borisov, A. A. Nabiev // Известия высших учебных заведений . - 2020. - №2. - P. 26-31. - (Серия химия и химическая технология)
Кл.слова (ненормированные):
водно-этанольные растворы сульфатов лития -- водно-этанольные растворы сульфатов натрия -- водно-этанольные растворы сульфатов калия -- кондуктометрия -- константы электролитической диссоциации -- электролиты -- молярная электропроводность
Аннотация: Кондуктометрическим методом определены константы электролитической диссоциации сульфатов лития, натрия и калия в водно-этанольных растворах при 25°С.
Держатели документа:
ЗКГУ
Доп.точки доступа:
Nabiev, A.A.
3.
Подробнее
28
D68
Dobrosmyslova, I. A.
Plant growth and biological productivity after processing with microelements. [Текст] / I. A. Dobrosmyslova // Bulletin of National Academy of Sciences of the Republic of Kazakhstan. - 2021. - №1. - P. 74-80
ББК 28
Рубрики: Biology
Кл.слова (ненормированные):
peas -- watering -- sodium selenite -- zeolite -- development -- productivity -- biochemical parameters -- soil
Аннотация: In laboratory conditions , the effect of sodium selenite and a mixture of sodium selenite and zeolite on the growth and biological productivity of peas was investigated.
Держатели документа:
WKU
Доп.точки доступа:
Sazanova, A.A.
Semenov, V.G.
Tuleubayev, Zh.
Yesimbekova, Z.T.
Ziyaeva, G.
D68
Dobrosmyslova, I. A.
Plant growth and biological productivity after processing with microelements. [Текст] / I. A. Dobrosmyslova // Bulletin of National Academy of Sciences of the Republic of Kazakhstan. - 2021. - №1. - P. 74-80
Рубрики: Biology
Кл.слова (ненормированные):
peas -- watering -- sodium selenite -- zeolite -- development -- productivity -- biochemical parameters -- soil
Аннотация: In laboratory conditions , the effect of sodium selenite and a mixture of sodium selenite and zeolite on the growth and biological productivity of peas was investigated.
Держатели документа:
WKU
Доп.точки доступа:
Sazanova, A.A.
Semenov, V.G.
Tuleubayev, Zh.
Yesimbekova, Z.T.
Ziyaeva, G.
4.
Подробнее
24(5каз)
M46
Medeuova, G. Z.
Research on the chemical composition of snow of Almaty city. [Текст] / G. Z. Medeuova, K. N. Zhaikbay, K. O. Kishibayev // Reports of the National Academy of Sciences of the Republic of Kazakhstan. - 2020. - №4. - P. 65-70
ББК 24(5каз)
Рубрики: chemistry
Кл.слова (ненормированные):
carbon oxides -- Natrium -- Magnesium -- Silicon -- Potassium -- Sodium -- Calcium -- Iron -- Chrome -- Copper -- Cadmium -- Polyphosphates -- characteristics of snow in Almaty
Аннотация: The article snows that according to the data of Kazgidromet from 2014-2015 years , Almaty takes one of the first places among the cities of Kazakhstan in terms of air pollution.
Держатели документа:
WKU
Доп.точки доступа:
Zhaikbay, K.N.
Kishibayev, K.O.
M46
Medeuova, G. Z.
Research on the chemical composition of snow of Almaty city. [Текст] / G. Z. Medeuova, K. N. Zhaikbay, K. O. Kishibayev // Reports of the National Academy of Sciences of the Republic of Kazakhstan. - 2020. - №4. - P. 65-70
Рубрики: chemistry
Кл.слова (ненормированные):
carbon oxides -- Natrium -- Magnesium -- Silicon -- Potassium -- Sodium -- Calcium -- Iron -- Chrome -- Copper -- Cadmium -- Polyphosphates -- characteristics of snow in Almaty
Аннотация: The article snows that according to the data of Kazgidromet from 2014-2015 years , Almaty takes one of the first places among the cities of Kazakhstan in terms of air pollution.
Держатели документа:
WKU
Доп.точки доступа:
Zhaikbay, K.N.
Kishibayev, K.O.
5.
Подробнее
35
Y46
Yessenamanova, M. S.
The content and distribution of the trace elements in soils during the development of oil fields in the republic of Kalmykia. [Текст] / M. S. Yessenamanova, Ts. D. Davaeva, L. Kh. Sangadzhieva, B. V. Tsombueva [et al.] // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №1. - P. 14-21
ББК 35
Рубрики: chemical Technology
Кл.слова (ненормированные):
oil-contaminated soils -- heavy metals -- trace elements -- oil products -- drilling sites
Аннотация: The article presents the results of chemical analysis soils of drilling sites of the Sostinsky and Mezhozerny oil fields of the Republic of Kalmykia. The content of sodium ions is more than 2 times higher in both deposits. At the same time, the content of chlorides in some areas of the Mezhozerny field reaches its maximum. As a result, the soils are highly saline in terms of the degree of salinity and are mainly chloride-sulfate-sodium in terms of the type of salinity.
Держатели документа:
WKU
Доп.точки доступа:
Davaeva, Ts.D.
Sangadzhieva, L.Kh.
Tsombueva, B.V.
Sangadzhieva, O.S.
Yessenamanova, Zh.S.
Tlepbergenova, A.E.
Y46
Yessenamanova, M. S.
The content and distribution of the trace elements in soils during the development of oil fields in the republic of Kalmykia. [Текст] / M. S. Yessenamanova, Ts. D. Davaeva, L. Kh. Sangadzhieva, B. V. Tsombueva [et al.] // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №1. - P. 14-21
Рубрики: chemical Technology
Кл.слова (ненормированные):
oil-contaminated soils -- heavy metals -- trace elements -- oil products -- drilling sites
Аннотация: The article presents the results of chemical analysis soils of drilling sites of the Sostinsky and Mezhozerny oil fields of the Republic of Kalmykia. The content of sodium ions is more than 2 times higher in both deposits. At the same time, the content of chlorides in some areas of the Mezhozerny field reaches its maximum. As a result, the soils are highly saline in terms of the degree of salinity and are mainly chloride-sulfate-sodium in terms of the type of salinity.
Держатели документа:
WKU
Доп.точки доступа:
Davaeva, Ts.D.
Sangadzhieva, L.Kh.
Tsombueva, B.V.
Sangadzhieva, O.S.
Yessenamanova, Zh.S.
Tlepbergenova, A.E.
6.
Подробнее
38.3
S70
Sokolova, Ya. А.
The study of the properties and structure of cement binding composition on electrolyte acqueous solutions activated by mechanomagnetic method. [Текст] / Ya. А. Sokolova, M. V. Akulova, B. R. Isakulov, А. G. Sokolova [et al.] // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №2. - P. 86-91
ББК 38.3
Рубрики: Строительные материалы
Кл.слова (ненормированные):
Cement compositions, -- mechanomagnetic activation -- electrolyte aqueous solutions -- differential thermo gravimetric analysis -- compressive strength -- structure formation of binders -- sodium thiosulphate -- calcium chloride
Аннотация: In the present paper, the issues of studying the influence of complex activation of grouting fluid on the structure and properties of the hardened cement paste and concrete are considered. The problem is relevant for manufacturing of building materials. In the paper, there was used the method of applying in the concrete mix composition of the elementary chemical substances undergone special physical treatment by means of mechanomagnetic activation. For more profound study of the structure formation processes in the hardened cement paste, the method of differential thermo gravimetric analysis has been used. As the research results have shown, the concrete samples on the activated electrolyte solutions are characterized by improved strength. In addition, on the base of differential thermo gravimetric analysis, it was proven that in the studied samples of the hardened cement paste on the electrolyte solutions activated by the method of mechanomagnetic treatment, the less calcium hydroxide and the more hydrated calcium silicate with amorphous and fine crystalline is formed. The obtained results for cement composites could be applied when manufacturing effective binder for concretes and mortars in the production of building materials and structures.
Держатели документа:
WKU
Доп.точки доступа:
Akulova, M.V.
Isakulov, B.R.
Sokolova, А.G.
Kul’sharov, B.B.
Isakulov, А.B.
S70
Sokolova, Ya. А.
The study of the properties and structure of cement binding composition on electrolyte acqueous solutions activated by mechanomagnetic method. [Текст] / Ya. А. Sokolova, M. V. Akulova, B. R. Isakulov, А. G. Sokolova [et al.] // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №2. - P. 86-91
Рубрики: Строительные материалы
Кл.слова (ненормированные):
Cement compositions, -- mechanomagnetic activation -- electrolyte aqueous solutions -- differential thermo gravimetric analysis -- compressive strength -- structure formation of binders -- sodium thiosulphate -- calcium chloride
Аннотация: In the present paper, the issues of studying the influence of complex activation of grouting fluid on the structure and properties of the hardened cement paste and concrete are considered. The problem is relevant for manufacturing of building materials. In the paper, there was used the method of applying in the concrete mix composition of the elementary chemical substances undergone special physical treatment by means of mechanomagnetic activation. For more profound study of the structure formation processes in the hardened cement paste, the method of differential thermo gravimetric analysis has been used. As the research results have shown, the concrete samples on the activated electrolyte solutions are characterized by improved strength. In addition, on the base of differential thermo gravimetric analysis, it was proven that in the studied samples of the hardened cement paste on the electrolyte solutions activated by the method of mechanomagnetic treatment, the less calcium hydroxide and the more hydrated calcium silicate with amorphous and fine crystalline is formed. The obtained results for cement composites could be applied when manufacturing effective binder for concretes and mortars in the production of building materials and structures.
Держатели документа:
WKU
Доп.точки доступа:
Akulova, M.V.
Isakulov, B.R.
Sokolova, А.G.
Kul’sharov, B.B.
Isakulov, А.B.
7.
Подробнее
24
M23
Mamyrbekova, А.
Study of kinetics of copper oxidation by electrolysis under non-stationary conditions. [Текст] / А. Mamyrbekova, А. Mamyrbekova, M. К. Kassymova, A. Zh. Aitbayeva, O. N. Chechina // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №3. - P. 54-59
ББК 24
Рубрики: chemistry
Кл.слова (ненормированные):
copper electro-oxidation -- copper (I) oxide -- copper (II) oxide -- unsteady electrolysis -- electrolyte -- polarisation curves
Аннотация: The nature of the anion electrolyte affects the rate of copper anodic oxidation, while the process occurs more efficiently in solutions of sulfate and sodium chloride and is accompanied by significant polarisation. Based on the study of kinetics the possibility of obtaining powders of metal oxide was shown, which further allowed to determine the parameters of the electrolysis process in non-stationary conditions in order to obtain highly dispersed materials based on copper oxides with specific physico-chemical properties.
Держатели документа:
WKU
Доп.точки доступа:
Mamyrbekova, А.
Kassymova, M.К.
Aitbayeva, A.Zh.
Chechina, O.N.
M23
Mamyrbekova, А.
Study of kinetics of copper oxidation by electrolysis under non-stationary conditions. [Текст] / А. Mamyrbekova, А. Mamyrbekova, M. К. Kassymova, A. Zh. Aitbayeva, O. N. Chechina // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №3. - P. 54-59
Рубрики: chemistry
Кл.слова (ненормированные):
copper electro-oxidation -- copper (I) oxide -- copper (II) oxide -- unsteady electrolysis -- electrolyte -- polarisation curves
Аннотация: The nature of the anion electrolyte affects the rate of copper anodic oxidation, while the process occurs more efficiently in solutions of sulfate and sodium chloride and is accompanied by significant polarisation. Based on the study of kinetics the possibility of obtaining powders of metal oxide was shown, which further allowed to determine the parameters of the electrolysis process in non-stationary conditions in order to obtain highly dispersed materials based on copper oxides with specific physico-chemical properties.
Держатели документа:
WKU
Доп.точки доступа:
Mamyrbekova, А.
Kassymova, M.К.
Aitbayeva, A.Zh.
Chechina, O.N.
8.
Подробнее
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.
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
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.
9.
Подробнее
35
R24
Rasulov, S. R.
Development of effective catalysts for processing C3-C4 Hydrocarbons. [Текст] / S. R. Rasulov, G. R. Mustafayeva // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №3. - P. 87-93
ББК 35
Рубрики: chemical Technology
Кл.слова (ненормированные):
refinery gases -- 3-C4 hydrocarbons -- zeolite-containing catalyst -- modifiers -- reaction-regeneration cycles.
Аннотация: The aim of the article is to study the effect of preparation and activation methods of a modified zeolite-containing catalyst on the activity and stability of catalytic properties displayed by it during the conversion of C3-C4 hydrocarbons. During the experiment, the industrial cracking catalyst OMNIKAT, which is a zeolite in the sodium form, was used as the initial one. Zinc, gallium, and REE (rare earth elements) were sequentially applied to decationized samples of this catalyst by ion exchange, impregnation, and dry mechanical mixing, and the effect of these methods on the catalytic properties of the zeolite-containing catalyst was observed. As a result of a comparative analysis of the regularities of aromatization of C3-C4hydrocarbons, it was found that the mechanical mixing method is the most preferable, since it provides the best process performance.
Держатели документа:
WKU
Доп.точки доступа:
Mustafayeva, G.R.
R24
Rasulov, S. R.
Development of effective catalysts for processing C3-C4 Hydrocarbons. [Текст] / S. R. Rasulov, G. R. Mustafayeva // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №3. - P. 87-93
Рубрики: chemical Technology
Кл.слова (ненормированные):
refinery gases -- 3-C4 hydrocarbons -- zeolite-containing catalyst -- modifiers -- reaction-regeneration cycles.
Аннотация: The aim of the article is to study the effect of preparation and activation methods of a modified zeolite-containing catalyst on the activity and stability of catalytic properties displayed by it during the conversion of C3-C4 hydrocarbons. During the experiment, the industrial cracking catalyst OMNIKAT, which is a zeolite in the sodium form, was used as the initial one. Zinc, gallium, and REE (rare earth elements) were sequentially applied to decationized samples of this catalyst by ion exchange, impregnation, and dry mechanical mixing, and the effect of these methods on the catalytic properties of the zeolite-containing catalyst was observed. As a result of a comparative analysis of the regularities of aromatization of C3-C4hydrocarbons, it was found that the mechanical mixing method is the most preferable, since it provides the best process performance.
Держатели документа:
WKU
Доп.точки доступа:
Mustafayeva, G.R.
Страница 1, Результатов: 9