Chemical Problems最新文献_第6页

DETERMINATION OF THERMODYNAMIC FUNCTIONS OF PHASE TRANSITION OF Cu8SiSe6 COMPOUND BY THE DSC METHOD DSC法测定Cu8SiSe6化合物相变的热力学函数

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-2-116-121

U.R. Bayramova

引用次数: 0

ON SOME ASPECTS OF NAFTALAN OIL PROPERTIES 论纳塔兰油性质的几个方面

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-2-122-132

G. Martynova, R. G. Nanajanova, N. Velimetova, S.Q. Zeinalov, N. Babayeva, L.R. Muradkhanova

{"title":"ON SOME ASPECTS OF NAFTALAN OIL PROPERTIES","authors":"G. Martynova, R. G. Nanajanova, N. Velimetova, S.Q. Zeinalov, N. Babayeva, L.R. Muradkhanova","doi":"10.32737/2221-8688-2022-2-122-132","DOIUrl":"https://doi.org/10.32737/2221-8688-2022-2-122-132","url":null,"abstract":"Naftalan medicinal and fuel oil properties have been studied by methods of IR/UV spectroscopy, DLS, chromato-mass-spectrometry and oil used for curative purposes throughout the year as well. It revealed that two types of Naftalan oil originated not only independently from one another but also from primary organic matter with critical differences, and this can be supported by data of chromato-massspectrometry. Identity of Naftalan field can be explained by the fact that it is confined to faults zone and by participation of deep fluids in the formation of oil properties. Lithological composition of rocks is of significant importance in the formation of a unique deposit where rocks are mainly of sandy composition ~ 27%, and clays are ~ 73%. According to DLS, data particles with diameter ranging from 100 to 1000 nm are more intensive in medicinal Naftalan oil. As for the sample of fuel oil, particles with diameter from 50 nm and lower can be observed. Used Naftalan oil tends to aggregate particles with diameter from 100 to 8000 nm; in this case particles of more than 1000 nm are stable up to 50°C. Diffusion coefficients are higher for samples of medicinal oil than for fuel one and this probably provides for pharmaceutic effect. Comparative study of Naftalan oil samples showed DLS data can be a peculiar kind of distinctive fingerprint for used medicinal oil","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85541500","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

PHASE RELATIONS IN THE Cu3SbS4-Sb2S3-S SYSTEM Cu3SbS4-Sb2S3-S体系的相关系

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-1-40-47

P. R. Mammadli, V. Gasimov, D. Babanly

引用次数: 0

RESEARCH INTO SORPTION PROCESS OF LEVOTHYROXINE WITH ALKYL-SUBSTITUTED CHITOSAN SCHIFF-BASED HYDROGEL 烷基取代壳聚糖席夫基水凝胶吸附左旋甲状腺素的研究

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-1-18-27

S. Safaraliyeva, D. Tagiyev, N. Zeynalov, S. Tapdiqov, S. Fatullayeva, M. Raucci

{"title":"RESEARCH INTO SORPTION PROCESS OF LEVOTHYROXINE WITH ALKYL-SUBSTITUTED CHITOSAN SCHIFF-BASED HYDROGEL","authors":"S. Safaraliyeva, D. Tagiyev, N. Zeynalov, S. Tapdiqov, S. Fatullayeva, M. Raucci","doi":"10.32737/2221-8688-2022-1-18-27","DOIUrl":"https://doi.org/10.32737/2221-8688-2022-1-18-27","url":null,"abstract":"In order to reduce the side effects of thyroid hormone substitute levothyroxine sodium pentahydrate, its sorption with a quaternized salt of a new alkyl derivative of chitosan was studied. The drug amount in the salt (gel) is in micrograms, and the gel-levothyroxine is in the form of a complex that can show biological activity. With that end in view, a sorption process of levothyroxine sodium from an aqueous solution to the inside and surface of the hydrogel was carried out under static conditions. The capacity of the hydrogel depending upon the pH medium, the ionic strength, the hydrogel dose, the concentration of the drug and the temperature was studied. It was shown that the effective sorption of levothyroxine by chitosan-based hydrogel was optimal at pH of 6-8.5, at 50 mg/L concentration of levothyroxine in the presence of 10-50 mg of hydrogel dose but the sorption degree begins to decrease after T=40 °C. The isotherm results of sorption processes have been found to be subordinate mainly to Langmuir and to some extent Freundlich equations. It revealed that gel degradation in the oxidizing medium is about 70% within 2 weeks, and in the elastase and PBS medium is about 17-20%.","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85309287","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

OPTIMAL DESIGN OF THE OXIDATIVE DEHYDROGENATION OF METHYLCYCLOHEXANE INTO METHYLCYCLOHEXADIENE ON A MODIFIED ZEOLITE CATALYST 改性沸石催化剂上甲基环己烷氧化脱氢制甲基环己二烯的优化设计

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-1-48-58

A. Karimov

引用次数: 0

COMPARATIVE ANALYSIS OF ELECTROCHROMIC PROPERTIES OF CuWO4•WO3, Bi2WO6•WO3 AND WO3 THIN FILMS CuWO4•WO3、Bi2WO6•WO3和WO3薄膜电致变色性能的比较分析

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-3-289-296

V. O. Smilyk, S. Fomanyuk, I. A. Rusetskiy, M. Danilov, G. Kolbasov

引用次数: 0

STUDY OF THE PROCESS OF OBTAINING ALTERNATIVE MOTOR FUELS USING VEGETABLE OILS 利用植物油制备替代汽车燃料的工艺研究

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-3-229-241

I. Khalafova, N. K. Andryushenko

{"title":"STUDY OF THE PROCESS OF OBTAINING ALTERNATIVE MOTOR FUELS USING VEGETABLE OILS","authors":"I. Khalafova, N. K. Andryushenko","doi":"10.32737/2221-8688-2022-3-229-241","DOIUrl":"https://doi.org/10.32737/2221-8688-2022-3-229-241","url":null,"abstract":"The growing shortage of oil resources makes it necessary to find alternative energy sources. The leading place among them today belongs to biofuels, both due to sufficient and affordable resources, and relatively advanced technologies for their production. The requirements of modern standards for the quality of the resulting gasolines limit the content of aromatic hydrocarbons in them to no more than 42% by mass. (Euro-3), and 35% of the mass. (Euro-4 and Euro-5). Therefore, studies on the involvement of vegetable raw materials in the processes of obtaining gasoline fractions are aimed either at obtaining highly aromatic gasoline with its subsequent compounding, or at searching for catalytic systems that make it possible, if any, to reduce the content of aromatic hydrocarbons in the composition of the resulting gasolines during joint cracking of the mixture of oil and vegetable raw materials. In this work, using the model oleic acid as an example, the mechanism of the conversion of fatty acids of vegetable oils during their catalytic conversion into hydrocarbons of the gasoline series was studied. The process was studied using a mixture of vacuum gas oil with vegetable oils as cracking catalysts, industrial cracking catalysts Omnikat-210P and Tseokar-600 in pure form and in their mixture with natural halloysite nanotubes. Halloysites belong to the family of kaolinite clay minerals with a high Al/Si ratio as compared to other aluminosilicates and have a predominantly hollow tubular structure and consist of layers of aluminum and silicon oxides that are rolled into tubes. The process of catalytic cracking of vacuum gas oil with the involvement of vegetable oils (waste vegetable oils taken from the Chudo-Pechka chain of stores) in the amount of 5 wt % was studied.","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79641891","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 PREPARATION METHOD OF IRON-, COPPER- CONTAINING OXIDE CATALYSTS ON THEIR ACTIVITY IN THE REACTION OF OXIDATION OF CARBON MONOXIDE TO CARBON DIOXIDE 含铁、含铜氧化物催化剂制备方法对其一氧化碳氧化制二氧化碳反应活性的影响

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-1-82-94

S. Zulfugarova, G. Azimova, Z. Aleskerova, R.J. Qasimov, M. Bayramov, E. H. Ismailov, D. Tagiyev

{"title":"EFFECT OF PREPARATION METHOD OF IRON-, COPPER- CONTAINING OXIDE CATALYSTS ON THEIR ACTIVITY IN THE REACTION OF OXIDATION OF CARBON MONOXIDE TO CARBON DIOXIDE","authors":"S. Zulfugarova, G. Azimova, Z. Aleskerova, R.J. Qasimov, M. Bayramov, E. H. Ismailov, D. Tagiyev","doi":"10.32737/2221-8688-2022-1-82-94","DOIUrl":"https://doi.org/10.32737/2221-8688-2022-1-82-94","url":null,"abstract":"Iron- and copper-containing oxide catalysts have been synthesized by sol-gel technology with autocombustion using organic reagents - citric acid, glycine, urea as a complexing agent and \"fuel\"; studied their activity in the oxidation of carbon monoxide to dioxide. The obtained samples were characterized by the methods of X-ray powder diffraction, infrared spectroscopy and electronic paramagnetic resonance, the texture characteristics of these samples was determined by measuring the specific surface area. It is shown that, regardless of the preparation method, all synthesized samples are mixtures of iron oxides Fe 2O3, copper CuO, and copper ferrite CuFe2O4. It was found that the nature of the organic reagent affects the catalytic activity of the synthesized catalysts. On a catalyst with a Cu:Fe=1:1 ratio, prepared by the sol-gel method with autocombustion using urea, the complete conversion of CO is achieved at 130°C. The same catalyst, synthesized with citric acid, is active at 250°C and on a catalyst prepared using glycine, complete conversion of CO occurs at a higher temperature of 350°C. It is assumed that the different nature of combustion leads to the formation of different surface morphology and texture, which ultimately determines the catalytic activity. Thus, the most catalytically active sample was obtained using urea as a \"fuel\" has a higher specific surface area (25 m2 / g) than the other two samples (for the samples obtained with citric acid and glycine, the specific surface area is 9 m2 / g and 5.8 m2 / g, respectively).","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82358271","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

DEVELOPMENT AND STUDY OF INHIBITOR TO PREVENT INORGANIC SALTS DEPOSITION 防止无机盐沉积抑制剂的开发与研究

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-2-175-182

Kh.I. Hasanov, N. N. Khalilov

引用次数: 0

ELECTROCHEMICAL TREATMENT OF AIRPORT RUNOFF WATER CONTAINING ETHYLENE GLYCOL 含乙二醇机场径流水的电化学处理

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-2-109-115

D.Sh. Magomedova, Z.M. Alimirzayeva, A. Magomedova, A. Isaev, T. Kharlamova

引用次数: 0