Pub Date : 2022-01-01DOI: 10.32737/2221-8688-2022-2-116-121
U.R. Bayramova
The ternary compound Cu8SiSe6 was studied by differential scanning calorimetry (DSC). Based on the data of DSC curves for two samples with different masses, the temperature and enthalpy of the phase transition from the low-temperature orthorhombic modification to the high-temperature cubic modification were determined. Using the Gibbs-Helmholtz equation, the entropy of the phase transition of the studied compound was also calculated.
{"title":"DETERMINATION OF THERMODYNAMIC FUNCTIONS OF PHASE TRANSITION OF Cu8SiSe6 COMPOUND BY THE DSC METHOD","authors":"U.R. Bayramova","doi":"10.32737/2221-8688-2022-2-116-121","DOIUrl":"https://doi.org/10.32737/2221-8688-2022-2-116-121","url":null,"abstract":"The ternary compound Cu8SiSe6 was studied by differential scanning calorimetry (DSC). Based on the data of DSC curves for two samples with different masses, the temperature and enthalpy of the phase transition from the low-temperature orthorhombic modification to the high-temperature cubic modification were determined. Using the Gibbs-Helmholtz equation, the entropy of the phase transition of the studied compound was also calculated.","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":"74384692","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}
Pub Date : 2022-01-01DOI: 10.32737/2221-8688-2022-2-122-132
G. Martynova, R. G. Nanajanova, N. Velimetova, S.Q. Zeinalov, N. Babayeva, L.R. Muradkhanova
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
{"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}
Pub Date : 2022-01-01DOI: 10.32737/2221-8688-2022-1-40-47
P. R. Mammadli, V. Gasimov, D. Babanly
Phase relations in the Cu3SbS4-Sb2S3-S system were determined experimentally over the entire concentration range by means of differential thermal analysis (DTA) and powder X-ray diffraction (PXRD) techniques. One boundary, two internal polythermal sections, and the liquidus surface projection of the system were constructed. Primary crystallization fields of existing phases, as well as, types and coordinates of non- and monovariant equilibria were determined. It was defined that, the concentration triangle under study is an independent subsystem of the Cu-Sb-S ternary system and belongs to the monotectic type with a wide stratification field of two liquids.
{"title":"PHASE RELATIONS IN THE Cu3SbS4-Sb2S3-S SYSTEM","authors":"P. R. Mammadli, V. Gasimov, D. Babanly","doi":"10.32737/2221-8688-2022-1-40-47","DOIUrl":"https://doi.org/10.32737/2221-8688-2022-1-40-47","url":null,"abstract":"Phase relations in the Cu3SbS4-Sb2S3-S system were determined experimentally over the entire concentration range by means of differential thermal analysis (DTA) and powder X-ray diffraction (PXRD) techniques. One boundary, two internal polythermal sections, and the liquidus surface projection of the system were constructed. Primary crystallization fields of existing phases, as well as, types and coordinates of non- and monovariant equilibria were determined. It was defined that, the concentration triangle under study is an independent subsystem of the Cu-Sb-S ternary system and belongs to the monotectic type with a wide stratification field of two liquids.","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":"86635386","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}
Pub Date : 2022-01-01DOI: 10.32737/2221-8688-2022-1-18-27
S. Safaraliyeva, D. Tagiyev, N. Zeynalov, S. Tapdiqov, S. Fatullayeva, M. Raucci
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%.
{"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}
Pub Date : 2022-01-01DOI: 10.32737/2221-8688-2022-1-48-58
A. Karimov
Selection and theoretical optimization of the reactor type was carried out on the basis of a kinetic model of the process of selective oxidative dehydrogenation of methylcyclohexane into methylcyclohexadiene on a modified active metal-zeolite catalyst. It was determined that it was more expedient to carry out the process in an ideal tubular ( packed-bed ) type reactor. As a result of theoretical optimization of the process, optimal technological regimes were determined and the optimal design dimensions of the reactor element for a given capacity calculated. A complete mathematical model of the process was developed with regard to the effect of heat and pressure drop.
{"title":"OPTIMAL DESIGN OF THE OXIDATIVE DEHYDROGENATION OF METHYLCYCLOHEXANE INTO METHYLCYCLOHEXADIENE ON A MODIFIED ZEOLITE CATALYST","authors":"A. Karimov","doi":"10.32737/2221-8688-2022-1-48-58","DOIUrl":"https://doi.org/10.32737/2221-8688-2022-1-48-58","url":null,"abstract":"Selection and theoretical optimization of the reactor type was carried out on the basis of a kinetic model of the process of selective oxidative dehydrogenation of methylcyclohexane into methylcyclohexadiene on a modified active metal-zeolite catalyst. It was determined that it was more expedient to carry out the process in an ideal tubular ( packed-bed ) type reactor. As a result of theoretical optimization of the process, optimal technological regimes were determined and the optimal design dimensions of the reactor element for a given capacity calculated. A complete mathematical model of the process was developed with regard to the effect of heat and pressure drop.","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":"75230137","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}
Pub Date : 2022-01-01DOI: 10.32737/2221-8688-2022-3-289-296
V. O. Smilyk, S. Fomanyuk, I. A. Rusetskiy, M. Danilov, G. Kolbasov
A comparative analysis of electrochromic properties of composites CuWO4•WO3, Bi2WO6•WO3 and WO3 films obtained by electrochemical and chemical methods was carried out. The study into the kinetics of light transmission and spectral characteristics of electrochromic coloration revealed some differences in electrochromic processes. It found that in the WO3, Bi2WO6•WO3, CuWO4•WO3 series, lithium intercalation in the film is slowed down, which is due to diffusion limitations in the process of coloring of the Bi and Cu oxides. Spectral characteristics of light transmission Bi2WO6•WO3 and CuWO4•WO3 also differ from WO3 in that the contribution to light absorption is also made by Bi and Cu oxides, which are partially reduced by lithium in the process of their coloring. It is shown that the metal tungstates can be effective electrochromic materials with an additional absorption band in the visible region
{"title":"COMPARATIVE ANALYSIS OF ELECTROCHROMIC PROPERTIES OF CuWO4•WO3, Bi2WO6•WO3 AND WO3 THIN FILMS","authors":"V. O. Smilyk, S. Fomanyuk, I. A. Rusetskiy, M. Danilov, G. Kolbasov","doi":"10.32737/2221-8688-2022-3-289-296","DOIUrl":"https://doi.org/10.32737/2221-8688-2022-3-289-296","url":null,"abstract":"A comparative analysis of electrochromic properties of composites CuWO4•WO3, Bi2WO6•WO3 and WO3 films obtained by electrochemical and chemical methods was carried out. The study into the kinetics of light transmission and spectral characteristics of electrochromic coloration revealed some differences in electrochromic processes. It found that in the WO3, Bi2WO6•WO3, CuWO4•WO3 series, lithium intercalation in the film is slowed down, which is due to diffusion limitations in the process of coloring of the Bi and Cu oxides. Spectral characteristics of light transmission Bi2WO6•WO3 and CuWO4•WO3 also differ from WO3 in that the contribution to light absorption is also made by Bi and Cu oxides, which are partially reduced by lithium in the process of their coloring. It is shown that the metal tungstates can be effective electrochromic materials with an additional absorption band in the visible region","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":"72736047","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}
Pub Date : 2022-01-01DOI: 10.32737/2221-8688-2022-3-229-241
I. Khalafova, N. K. Andryushenko
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.
{"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}
Pub Date : 2022-01-01DOI: 10.32737/2221-8688-2022-1-82-94
S. Zulfugarova, G. Azimova, Z. Aleskerova, R.J. Qasimov, M. Bayramov, E. H. Ismailov, D. Tagiyev
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).
{"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}
Pub Date : 2022-01-01DOI: 10.32737/2221-8688-2022-2-175-182
Kh.I. Hasanov, N. N. Khalilov
The paper deals with potential compositions developed for inhibiting scale deposition on oil refining equipment and pipelines based on inhibited hydrochloric acid, dispersant EС 9660A, laprol 4202- 2B-30 and water. The density of the produced compositions at 20 ºС is 1020-1050 kg/m3 , the kinematic viscosity at 20 ºС is 30-40 mm2 /s, the pour point is minus 5-15 ºС, the hydrogen index pH = 2-3. The efficiency of scale inhibition was evaluated by means of common practice which relies on the ability of the chemical to retain calcium and magnesium cations in simulated artificial mineral water. It was established that the compositions at a consumption rate of 50 mg/l generate a better protective effect (76.3-85.6 % ) as compared to cases when the inhibitor consumption was 40 mg/l (73.1-83.2 %) and 30 mg/l (70.4-78.1 %). The compositions with 10 % of mass fraction of laprol 4202-2B-30 have demonstrated higher protective properties.
{"title":"DEVELOPMENT AND STUDY OF INHIBITOR TO PREVENT INORGANIC SALTS DEPOSITION","authors":"Kh.I. Hasanov, N. N. Khalilov","doi":"10.32737/2221-8688-2022-2-175-182","DOIUrl":"https://doi.org/10.32737/2221-8688-2022-2-175-182","url":null,"abstract":"The paper deals with potential compositions developed for inhibiting scale deposition on oil refining equipment and pipelines based on inhibited hydrochloric acid, dispersant EС 9660A, laprol 4202- 2B-30 and water. The density of the produced compositions at 20 ºС is 1020-1050 kg/m3 , the kinematic viscosity at 20 ºС is 30-40 mm2 /s, the pour point is minus 5-15 ºС, the hydrogen index pH = 2-3. The efficiency of scale inhibition was evaluated by means of common practice which relies on the ability of the chemical to retain calcium and magnesium cations in simulated artificial mineral water. It was established that the compositions at a consumption rate of 50 mg/l generate a better protective effect (76.3-85.6 % ) as compared to cases when the inhibitor consumption was 40 mg/l (73.1-83.2 %) and 30 mg/l (70.4-78.1 %). The compositions with 10 % of mass fraction of laprol 4202-2B-30 have demonstrated higher protective properties.","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":"86864375","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}
Pub Date : 2022-01-01DOI: 10.32737/2221-8688-2022-2-109-115
D.Sh. Magomedova, Z.M. Alimirzayeva, A. Magomedova, A. Isaev, T. Kharlamova
Airports are one of the sources of environmental pollution with runoff water containing emerging contaminants. The process of electrochemical purification of model runoff water containing ethylene glycol and formed during the treatment of aircraft with anti-icing agents was studied. As an anode there was used PbO2 electrode. The structure and morphology of PbO2 electrode samples obtained by electrochemical deposition on the titanium plate surface was studied using scanning electron microscopy. It revealed that the use of PbO2 as an anode makes it possible to bring the COD value of the solution to the required standards. After electrolysis, the COD values for all studied ethylene glycol concentrations from 10 to 100 mg/l were in the range of 0.34-4.6 mgO2/l. The effect of current density, concentration of ethylene glycol and sodium chloride on the efficiency of electrochemical oxidation of ethylene glycol was analyzed.
{"title":"ELECTROCHEMICAL TREATMENT OF AIRPORT RUNOFF WATER CONTAINING ETHYLENE GLYCOL","authors":"D.Sh. Magomedova, Z.M. Alimirzayeva, A. Magomedova, A. Isaev, T. Kharlamova","doi":"10.32737/2221-8688-2022-2-109-115","DOIUrl":"https://doi.org/10.32737/2221-8688-2022-2-109-115","url":null,"abstract":"Airports are one of the sources of environmental pollution with runoff water containing emerging contaminants. The process of electrochemical purification of model runoff water containing ethylene glycol and formed during the treatment of aircraft with anti-icing agents was studied. As an anode there was used PbO2 electrode. The structure and morphology of PbO2 electrode samples obtained by electrochemical deposition on the titanium plate surface was studied using scanning electron microscopy. It revealed that the use of PbO2 as an anode makes it possible to bring the COD value of the solution to the required standards. After electrolysis, the COD values for all studied ethylene glycol concentrations from 10 to 100 mg/l were in the range of 0.34-4.6 mgO2/l. The effect of current density, concentration of ethylene glycol and sodium chloride on the efficiency of electrochemical oxidation of ethylene glycol was analyzed.","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":"85071959","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}
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