Pub Date : 2022-01-01DOI: 10.32737/2221-8688-2022-1-59-67
Sh.Z. Tapdigov, F. Ahmad, N. Hamidov, E. Bayramov
As a result of intrastratal and interlayer flows of produced water of varying intensity, 25% of oil and gas wells are water-encroached in the world. Due to behind casing flow during the operation of oil and gas wells generally reduces the field's development efficiency. In the study, 1-6% (weight) polyethylene polyamine (PEPA) was added to the water in which the cement mixture will be prepared. The temperature dependence of the beginning and the end of the setting time of the obtained cement mortar was determined. Also, the adhesion properties of the cement mortar, the dependence of the strength to bending and compression on the dose of polymer were examined. It found that cement stone made of mixing cement with an aqueous solution containing 1-4% PEPA had high elastic properties. In addition, the presence of 2±1.5% PEPA in the specified amount of tampon solution increases the strength and to depressions of cement stone, improves adhesion properties.
{"title":"INCREASE IN THE EFFICIENCY OF WATER SHUT-OFF WITH THE APPLICATION OF POLYETYLENPOLYAMINE ADDED CEMENT","authors":"Sh.Z. Tapdigov, F. Ahmad, N. Hamidov, E. Bayramov","doi":"10.32737/2221-8688-2022-1-59-67","DOIUrl":"https://doi.org/10.32737/2221-8688-2022-1-59-67","url":null,"abstract":"As a result of intrastratal and interlayer flows of produced water of varying intensity, 25% of oil and gas wells are water-encroached in the world. Due to behind casing flow during the operation of oil and gas wells generally reduces the field's development efficiency. In the study, 1-6% (weight) polyethylene polyamine (PEPA) was added to the water in which the cement mixture will be prepared. The temperature dependence of the beginning and the end of the setting time of the obtained cement mortar was determined. Also, the adhesion properties of the cement mortar, the dependence of the strength to bending and compression on the dose of polymer were examined. It found that cement stone made of mixing cement with an aqueous solution containing 1-4% PEPA had high elastic properties. In addition, the presence of 2±1.5% PEPA in the specified amount of tampon solution increases the strength and to depressions of cement stone, improves adhesion properties.","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84681503","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: 10.32737/2221-8688-2022-1-68-81
T. Ilyasly, G. G. Gahramanova, R. Abbasova, S.M. Veysova, Z. Ismailov
The nature of the physicochemical interaction in the Tm-As-S and Tm-As-Se systems was studied along various cross sections by methods of Differential Thermal (DTA), X-Ray Diffraction (XRD) and Microstructural (MSA) Analyzes, measuring their micro-hardness and determining their electrophysical properties. The investigation of the alloys of the system started by studying the properties of the initial components in cooling modes of 7–10deg/min. After establishing the boundary of the glass formation region in the systems, the physicochemical properties of glasses and intermediate phases were studied. Analysis showed that all effects on the thermograms were reversible. The compounds of TmAsS3, TmAs4S7, TmAs2S4, Tm3As4S9 compositions were formed in the As2S3-Tm2S3, As2S3-TmS systems. The compounds of TmAs4S7, TmAsS and TmAs2S4 compositions melted congruently, while the compounds of Tm3As4S9 and TmAsS3 melted incongruently. TmAsSe, TmAsSe3, TmAs4Se7, TmAs2Se4 and Tm3As4Se9 phases were formed in the Tm-As-Se system while Tm3As4Se9 was formed by the peritectic reaction TmSe + L ↔ Tm3As4Se9. Microstructural analysis showed that all alloys of the Tm-As-S, Tm-As-Se cross sections were two-phase, except for the composition of intermediate phases. Proceeding from the results of XRD, the lattice parameters of TmAsS, TmAsS3, TmAs4S7, TmAs2S4, as well as parameters of selenium-containing compound were calculated; it found that it crystallized in the rhombic syngony. Based on the results of physicochemical analysis, it was established that the studied cross sections were quasi-binary sections of the Tm-As-S and Tm-As-Se ternary systems. The phase diagram of cross sections with the participation of sulfur and selenium was plotted using the results of physicochemical analysis; it established that the studied cross sections were quasi-binary sections of the Tm-As-S and Tm-As-Se ternary systems.
{"title":"GLASS FORMATION AND PHASE EQUILIBRIA IN THE Tm-As-S AND Tm-As-Se SYSTEMS AND THEIR PROPERTIES","authors":"T. Ilyasly, G. G. Gahramanova, R. Abbasova, S.M. Veysova, Z. Ismailov","doi":"10.32737/2221-8688-2022-1-68-81","DOIUrl":"https://doi.org/10.32737/2221-8688-2022-1-68-81","url":null,"abstract":"The nature of the physicochemical interaction in the Tm-As-S and Tm-As-Se systems was studied along various cross sections by methods of Differential Thermal (DTA), X-Ray Diffraction (XRD) and Microstructural (MSA) Analyzes, measuring their micro-hardness and determining their electrophysical properties. The investigation of the alloys of the system started by studying the properties of the initial components in cooling modes of 7–10deg/min. After establishing the boundary of the glass formation region in the systems, the physicochemical properties of glasses and intermediate phases were studied. Analysis showed that all effects on the thermograms were reversible. The compounds of TmAsS3, TmAs4S7, TmAs2S4, Tm3As4S9 compositions were formed in the As2S3-Tm2S3, As2S3-TmS systems. The compounds of TmAs4S7, TmAsS and TmAs2S4 compositions melted congruently, while the compounds of Tm3As4S9 and TmAsS3 melted incongruently. TmAsSe, TmAsSe3, TmAs4Se7, TmAs2Se4 and Tm3As4Se9 phases were formed in the Tm-As-Se system while Tm3As4Se9 was formed by the peritectic reaction TmSe + L ↔ Tm3As4Se9. Microstructural analysis showed that all alloys of the Tm-As-S, Tm-As-Se cross sections were two-phase, except for the composition of intermediate phases. Proceeding from the results of XRD, the lattice parameters of TmAsS, TmAsS3, TmAs4S7, TmAs2S4, as well as parameters of selenium-containing compound were calculated; it found that it crystallized in the rhombic syngony. Based on the results of physicochemical analysis, it was established that the studied cross sections were quasi-binary sections of the Tm-As-S and Tm-As-Se ternary systems. The phase diagram of cross sections with the participation of sulfur and selenium was plotted using the results of physicochemical analysis; it established that the studied cross sections were quasi-binary sections of the Tm-As-S and Tm-As-Se ternary systems.","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88668751","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: 10.32737/2221-8688-2022-1-95-101
S. Hasanova
The molecular structure of the new Ni(II) complex of p-nitrobenzoic acid and pyrazine was synthesized and deciphered. It found that the central atom was coordinated by the ligand of p-nitrobenzoic acid according to the monodentate type. Having the basic properties of the pyrazine molecule, it was coordinated by the nickel atom in a donor-acceptor type of bond through donor nitrogen atoms. Two water molecules through donor oxygen atoms were coordinated by nickel and complement its coordination number to six. Pyrazine molecules cross-link para-nitrobenzoate Ni(II) molecules with the help of donor nitrogen atoms and form polymeric molecules
{"title":"SYNTHESIS, PHYSICOCHEMICAL STUDY AND CRYSTAL STRUCTURE OF BIS-(PNITROBENZOATE)-DI-(PYRAZINE) NICKEL(II)-DIHYDRATE","authors":"S. Hasanova","doi":"10.32737/2221-8688-2022-1-95-101","DOIUrl":"https://doi.org/10.32737/2221-8688-2022-1-95-101","url":null,"abstract":"The molecular structure of the new Ni(II) complex of p-nitrobenzoic acid and pyrazine was synthesized and deciphered. It found that the central atom was coordinated by the ligand of p-nitrobenzoic acid according to the monodentate type. Having the basic properties of the pyrazine molecule, it was coordinated by the nickel atom in a donor-acceptor type of bond through donor nitrogen atoms. Two water molecules through donor oxygen atoms were coordinated by nickel and complement its coordination number to six. Pyrazine molecules cross-link para-nitrobenzoate Ni(II) molecules with the help of donor nitrogen atoms and form polymeric molecules","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87046070","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: 10.32737/2221-8688-2022-3-249-255
A. Ibrahimov, A. Heydarov, R. Vakilova, R.Y. Badalova
The article presents a method to determine an amount of alunite in alunite ore and technological samples by alternative method. The essence of the method is that the alunite mineral in the ore is heated to the temperature of complete decomposition (800-8500C) and the degree of alunitation of the ore for the total mass loss, based on the amount of aluminum oxide and sulfur trioxide. The method was compared with other available methods (thermal, chemical, X-ray phase). The advantage of the method is that more than one sample is analyzed at a time, the analysis is completed in a short time, no preliminary preparations are made, nor chemical reagents are used. Alunite ore consists of alunite and non-alunite (kaolinite, hematite, quartz). Since the mass loss during the heating of the ore is mainly caused by the decomposition of alunite, a mathematical relationship of a%=2.34ωloss was found between the loss and the degree of alunitation. According to the degree of alunitation, for the aluminum oxide and sulfur trioxide in the ore, the expressions ω(Al2O3)=0.8775⋅ωloss, ω(SO3)=0.6888∙ωloss were obtained. Chemical, derivotographic methods of analysis experimentally confirmed the adequacy of these equations. It was established that in order to completely decompose the ore, it is necessary to heat it at 8500C for half an hour and at 8000C for an hour
{"title":"EXPRESS ANALYSIS METHOD OF ALUNITE ORE","authors":"A. Ibrahimov, A. Heydarov, R. Vakilova, R.Y. Badalova","doi":"10.32737/2221-8688-2022-3-249-255","DOIUrl":"https://doi.org/10.32737/2221-8688-2022-3-249-255","url":null,"abstract":"The article presents a method to determine an amount of alunite in alunite ore and technological samples by alternative method. The essence of the method is that the alunite mineral in the ore is heated to the temperature of complete decomposition (800-8500C) and the degree of alunitation of the ore for the total mass loss, based on the amount of aluminum oxide and sulfur trioxide. The method was compared with other available methods (thermal, chemical, X-ray phase). The advantage of the method is that more than one sample is analyzed at a time, the analysis is completed in a short time, no preliminary preparations are made, nor chemical reagents are used. Alunite ore consists of alunite and non-alunite (kaolinite, hematite, quartz). Since the mass loss during the heating of the ore is mainly caused by the decomposition of alunite, a mathematical relationship of a%=2.34ωloss was found between the loss and the degree of alunitation. According to the degree of alunitation, for the aluminum oxide and sulfur trioxide in the ore, the expressions ω(Al2O3)=0.8775⋅ωloss, ω(SO3)=0.6888∙ωloss were obtained. Chemical, derivotographic methods of analysis experimentally confirmed the adequacy of these equations. It was established that in order to completely decompose the ore, it is necessary to heat it at 8500C for half an hour and at 8000C for an hour","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79116402","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: 10.32737/2221-8688-2022-2-183-190
G. I. Alyshanly, A. A. Geidarov, A. Mammadov, S.Kh. Kalantarova
The article deals with the application of the fuzzy logic approach to the stage of precipitation of aluminum hydroxide from sodium aluminate solutions obtained from the alkaline solution of raw alunite by hydrogen peroxide as an eco-friendly reagent. Factors influencing the precipitation of aluminum hydroxide in the presence of H2O2 from poor aluminate solutions include the concentration of hydrogen peroxide, the volume of hydrogen peroxide, and other parameters. The application of fuzzy logic to this process allows calculating the probabilities that the parameters can occur not only in one value but in a wide range as well, to find the optimal conditions for obtaining high-yield aluminum hydroxide. Based on the results of the experiments, it is possible to precipitate aluminum hydroxide with a yield of 92% using 15.5 ml of 17% hydrogen peroxide at 25 °C using fuzzy sets suitable for low, medium and high levels, and this figure can be increased or decreased by changing the parameters. The simulation of process control through a fuzzy logic controller is compiled using membership functions in Matlab.
{"title":"MODELLING OF THE PRECIPITATION PROCESS OF ALUMINIUM HYDROXIDE FROM ALUMINATE SOLUTIONS BASED ON FUZZY LOGIC THEORY","authors":"G. I. Alyshanly, A. A. Geidarov, A. Mammadov, S.Kh. Kalantarova","doi":"10.32737/2221-8688-2022-2-183-190","DOIUrl":"https://doi.org/10.32737/2221-8688-2022-2-183-190","url":null,"abstract":"The article deals with the application of the fuzzy logic approach to the stage of precipitation of aluminum hydroxide from sodium aluminate solutions obtained from the alkaline solution of raw alunite by hydrogen peroxide as an eco-friendly reagent. Factors influencing the precipitation of aluminum hydroxide in the presence of H2O2 from poor aluminate solutions include the concentration of hydrogen peroxide, the volume of hydrogen peroxide, and other parameters. The application of fuzzy logic to this process allows calculating the probabilities that the parameters can occur not only in one value but in a wide range as well, to find the optimal conditions for obtaining high-yield aluminum hydroxide. Based on the results of the experiments, it is possible to precipitate aluminum hydroxide with a yield of 92% using 15.5 ml of 17% hydrogen peroxide at 25 °C using fuzzy sets suitable for low, medium and high levels, and this figure can be increased or decreased by changing the parameters. The simulation of process control through a fuzzy logic controller is compiled using membership functions in Matlab.","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":"360 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82639967","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: 10.32737/2221-8688-2022-2-164-174
S. Mammadova, U.B. Abasqulieva, A. Zalov, N. A. Novruzova
Spectrophotometric methods were used to study the reaction of complexation of tungsten with derivatives of o-hydroxythiophenol (HTPDs) {2-hydroxy-5-chlorothiophenol (HCTP), 2-hydroxy-5- bromothiophenol (HBTP) and 2-hydroxy-5-iodothiophenol (HITP )} in the presence of aminophenols. Aminophenols used were 2(N,N-dimethylaminomethyl)-4-chlorophenol (AP1) and 2(N,Ndimethylaminomethyl)-4-bromophenol (AP2), 2(N,N-dimethylaminomethyl) -4-iodophenol (AP3).Optimal conditions for the formation and extraction of mixed ligand complexes (MLC) were found, and the ratios of the components in the complexes established. It revealed that MLC are formed in a weakly acidic environment (рНopt 4.5-5.5). The maximum in the light absorption spectrum is observed at λ=460-490 nm. The molar coefficient of light absorption is equal to ε = (2.0-2.8) × 10 4 . Optimal conditions for the formation and extraction of these compounds is the concentration of (1.2-2.5) × 10-3 mol / l GTP and (2.0-2.8)×10-3 mol/l AP. The maximum optical density is reached within 5-8 minutes. Tungsten MLC extracts with HTP and AP obeys Beer's law at concentrations of 0.04–3.8 μg/5 ml. The proposed method was applied to determine Tungsten in steel and in soils.
{"title":"SPECTROPHOTOMETRIC RESEARCH INTO COMPLEXATION OF TUNGSTEN(VI) WITH o-HYDROXYTHIOPHENOL DERIVATIVES IN THE PRESENCE OF HYDROPHOBIC AMINES","authors":"S. Mammadova, U.B. Abasqulieva, A. Zalov, N. A. Novruzova","doi":"10.32737/2221-8688-2022-2-164-174","DOIUrl":"https://doi.org/10.32737/2221-8688-2022-2-164-174","url":null,"abstract":"Spectrophotometric methods were used to study the reaction of complexation of tungsten with derivatives of o-hydroxythiophenol (HTPDs) {2-hydroxy-5-chlorothiophenol (HCTP), 2-hydroxy-5- bromothiophenol (HBTP) and 2-hydroxy-5-iodothiophenol (HITP )} in the presence of aminophenols. Aminophenols used were 2(N,N-dimethylaminomethyl)-4-chlorophenol (AP1) and 2(N,Ndimethylaminomethyl)-4-bromophenol (AP2), 2(N,N-dimethylaminomethyl) -4-iodophenol (AP3).Optimal conditions for the formation and extraction of mixed ligand complexes (MLC) were found, and the ratios of the components in the complexes established. It revealed that MLC are formed in a weakly acidic environment (рНopt 4.5-5.5). The maximum in the light absorption spectrum is observed at λ=460-490 nm. The molar coefficient of light absorption is equal to ε = (2.0-2.8) × 10 4 . Optimal conditions for the formation and extraction of these compounds is the concentration of (1.2-2.5) × 10-3 mol / l GTP and (2.0-2.8)×10-3 mol/l AP. The maximum optical density is reached within 5-8 minutes. Tungsten MLC extracts with HTP and AP obeys Beer's law at concentrations of 0.04–3.8 μg/5 ml. The proposed method was applied to determine Tungsten in steel and in soils.","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81931301","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: 10.32737/2221-8688-2022-3-277-281
Z. Mansimov
The - irradiated 77K samples (RaO)x(SiO2)y with adsorbed water were studied using EPR spectroscopy, and EPR spectrum with g=2.0028 and hyperfine splitting constant A(H)=505.3 G belonging to hydrogen atoms was registered. EPR, presumably attributed to paramagnetic hole (≡Si-O)+ , electronic (≡Si-) - centers and products of their interaction with water molecules spectra was registered. It is assumed that the main part of atomic hydrogen was oxidized to the HO2 • radical, and some of the H• atoms participate in surface radiative hydrogenation reactions with the formation of hydrogen-containing radicals when irradiated samples were heated from 77 K to room temperature. It is also assumed that •OH radicals are formed on the surface of --irradiated at 77K (RaO)x(SiO2)y samples.
{"title":"PARAMAGNETIC CENTERS IN GAMMA IRRADIATED (RaO)x(SiO2)y SAMPLES WITH ADSORBED WATER","authors":"Z. Mansimov","doi":"10.32737/2221-8688-2022-3-277-281","DOIUrl":"https://doi.org/10.32737/2221-8688-2022-3-277-281","url":null,"abstract":"The - irradiated 77K samples (RaO)x(SiO2)y with adsorbed water were studied using EPR spectroscopy, and EPR spectrum with g=2.0028 and hyperfine splitting constant A(H)=505.3 G belonging to hydrogen atoms was registered. EPR, presumably attributed to paramagnetic hole (≡Si-O)+ , electronic (≡Si-) - centers and products of their interaction with water molecules spectra was registered. It is assumed that the main part of atomic hydrogen was oxidized to the HO2 • radical, and some of the H• atoms participate in surface radiative hydrogenation reactions with the formation of hydrogen-containing radicals when irradiated samples were heated from 77 K to room temperature. It is also assumed that •OH radicals are formed on the surface of --irradiated at 77K (RaO)x(SiO2)y samples.","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82036888","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 : 2021-01-01DOI: 10.32737/2221-8688-2021-4-250-255
A. M. Garamanov, R. A. Akhmedova, B. Mamedov, A. F. Mamedova, N. Gusiev, M. Gurbanov
The interaction of 1 mol aminoethane acid with 1 mol of allyl chloride and 1 mol of (β-chlor)allyl chloride in an aqueous solution of sodium hydroxide (pH12) leads to the synthesis of the new monomer – N-allyl-N(β-chlor)allylethanic acid (AEA) with a yield of 50%. During polymerization of AEC (T=60-70) in aqueous solution in the presence of ammonium persulfate (PA) initiator with a concentration of 4x10-4- 5x10-3 mol/L, water-soluble polymers with rather high values of reduced viscosity ([ηprid] = 0.18-0.20 dl/g) for the above mentioned amine were obtained. It was established that the polymerization proceeded on the double bonds of diallyl groups according to the cycle-linear mechanism with pyrrolidine stucture.
{"title":"SYNTHESIS AND POLYMERIZATION OF N-ALLYL-N-(β-CHLOR)ALLYL ETHANIC ACID","authors":"A. M. Garamanov, R. A. Akhmedova, B. Mamedov, A. F. Mamedova, N. Gusiev, M. Gurbanov","doi":"10.32737/2221-8688-2021-4-250-255","DOIUrl":"https://doi.org/10.32737/2221-8688-2021-4-250-255","url":null,"abstract":"The interaction of 1 mol aminoethane acid with 1 mol of allyl chloride and 1 mol of (β-chlor)allyl chloride in an aqueous solution of sodium hydroxide (pH12) leads to the synthesis of the new monomer – N-allyl-N(β-chlor)allylethanic acid (AEA) with a yield of 50%. During polymerization of AEC (T=60-70) in aqueous solution in the presence of ammonium persulfate (PA) initiator with a concentration of 4x10-4- 5x10-3 mol/L, water-soluble polymers with rather high values of reduced viscosity ([ηprid] = 0.18-0.20 dl/g) for the above mentioned amine were obtained. It was established that the polymerization proceeded on the double bonds of diallyl groups according to the cycle-linear mechanism with pyrrolidine stucture.","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":"149 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86602052","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 : 2021-01-01DOI: 10.32737/2221-8688-2021-2-113-119
R. Kerimov, I. B. Bakhtiyarly, S. Namazov, F. Guliyev, V. Mammadov, Sh.S. Abdullayeva, Sh.M. Mashayev
A new functional cast iron alloyed with transition metals was synthesized for the manufacture of the working part of rolls. Its properties were studied using complex methods of physicochemical analysis (DTA, X-ray, MSA and measurement of hardness and microhardness). It was found that traces of martenicite, cementite, carbon (graphite) and α-ferritin are released in the subsolidus during cooling of molten iron in the studied concentration range (2.7 ÷ 3.5 %wt C. It includes transition metals as an alloying agent increasing resistance of cast iron to twisting, corrosion and destruction during operation.
{"title":"SYNTHESIS AND STUDY OF PHYSICOCHEMICAL PROPERTIES OF CAST IRON WITH FUNCTIONAL PROPERTIES FOR WORKING PART OF BIMETALLIC ROLLING PINS","authors":"R. Kerimov, I. B. Bakhtiyarly, S. Namazov, F. Guliyev, V. Mammadov, Sh.S. Abdullayeva, Sh.M. Mashayev","doi":"10.32737/2221-8688-2021-2-113-119","DOIUrl":"https://doi.org/10.32737/2221-8688-2021-2-113-119","url":null,"abstract":"A new functional cast iron alloyed with transition metals was synthesized for the manufacture of the working part of rolls. Its properties were studied using complex methods of physicochemical analysis (DTA, X-ray, MSA and measurement of hardness and microhardness). It was found that traces of martenicite, cementite, carbon (graphite) and α-ferritin are released in the subsolidus during cooling of molten iron in the studied concentration range (2.7 ÷ 3.5 %wt C. It includes transition metals as an alloying agent increasing resistance of cast iron to twisting, corrosion and destruction during operation.","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91328932","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 : 2021-01-01DOI: 10.32737/2221-8688-2021-4-203-214
O. Akperov, F.M. Kamranzadeh, E. Akperov
The article provides data on the use of crosslinked with hexamethylenediamine alt-maleic anhydride-styrene copolymer, as a sorbent for the remove of the Rhodamine 6G dye from aqueous solution. The effect of the pH, sorbent amount, contact time, temperature and dye concentration on sorption was studied. The obtained data were processed in the coordinates of the Langmuir, Freundlich and D-R models equations and the values of the equilibrium sorption capacity and mean sorption energy were determined. The found value of the mean sorption energy from D–R equation ED=4.556<8.0 kJ mol–1 , indicated that the sorption of Rh6G by synthesized polymer-sorbent has physical character. Also, thermodynamic parameters, like standard Gibbs free energy (∆G˚), standart enthalpy change (∆H˚) and standart entropy change (∆S˚) were determined. The positive values of ΔG° confirm the nonspontaneous of adsorption process, and the positive value of ΔH° (12.464 kJ mol–1 ) suggested that the adsorption was endothermic in nature. The positive value of ΔS° (0.0271 kJ mol–1 K –1 ) shows the increasing randomness during adsorption process.
本文介绍了用六亚甲二胺-马来酸酐-苯乙烯共聚物交联作为吸附剂对罗丹明6G染料的脱除效果。研究了pH、吸附剂用量、接触时间、温度和染料浓度对吸附性能的影响。得到的数据在Langmuir、Freundlich和D-R模型方程的坐标下进行处理，确定了平衡吸附容量和平均吸附能的值。由D-R方程得到的平均吸附能ED=4.556<8.0 kJ mol-1，表明合成的高分子吸附剂对Rh6G的吸附具有物理性质。测定了标准吉布斯自由能(∆G˚)、标准焓变(∆H˚)和标准熵变(∆S˚)等热力学参数。ΔG°正值表明吸附过程是非自发的，ΔH°正值(12.464 kJ mol-1)表明吸附是吸热的。ΔS°(0.0271 kJ mol-1 K -1)的正值表明吸附过程的随机性越来越大。
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