Chemical Problems最新文献_第7页

INCREASE IN THE EFFICIENCY OF WATER SHUT-OFF WITH THE APPLICATION OF POLYETYLENPOLYAMINE ADDED CEMENT 掺加聚乙烯多胺的水泥可提高堵水效率

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-1-59-67

Sh.Z. Tapdigov, F. Ahmad, N. Hamidov, E. Bayramov

引用次数: 1

GLASS FORMATION AND PHASE EQUILIBRIA IN THE Tm-As-S AND Tm-As-Se SYSTEMS AND THEIR PROPERTIES Tm-As-S和Tm-As-Se体系的玻璃形成和相平衡及其性质

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-1-68-81

T. Ilyasly, G. G. Gahramanova, R. Abbasova, S.M. Veysova, Z. Ismailov

{"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":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":"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}

引用次数: 0

SYNTHESIS, PHYSICOCHEMICAL STUDY AND CRYSTAL STRUCTURE OF BIS-(PNITROBENZOATE)-DI-(PYRAZINE) NICKEL(II)-DIHYDRATE 双-(硝基苯甲酸酯)-二-(吡嗪)镍(ii)-二水合物的合成、理化研究及晶体结构

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-1-95-101

S. Hasanova

引用次数: 0

EXPRESS ANALYSIS METHOD OF ALUNITE ORE 明矾石矿石的快速分析方法

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-3-249-255

A. Ibrahimov, A. Heydarov, R. Vakilova, R.Y. Badalova

{"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":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":"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}

引用次数: 0

MODELLING OF THE PRECIPITATION PROCESS OF ALUMINIUM HYDROXIDE FROM ALUMINATE SOLUTIONS BASED ON FUZZY LOGIC THEORY 基于模糊逻辑理论的铝酸盐溶液中氢氧化铝析出过程建模

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-2-183-190

G. I. Alyshanly, A. A. Geidarov, A. Mammadov, S.Kh. Kalantarova

{"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":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":"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}

引用次数: 0

SPECTROPHOTOMETRIC RESEARCH INTO COMPLEXATION OF TUNGSTEN(VI) WITH o-HYDROXYTHIOPHENOL DERIVATIVES IN THE PRESENCE OF HYDROPHOBIC AMINES 在疏水胺存在下，钨(VI)与邻羟基噻吩衍生物络合的分光光度研究

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-2-164-174

S. Mammadova, U.B. Abasqulieva, A. Zalov, N. A. Novruzova

{"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":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":"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}

引用次数: 1

PARAMAGNETIC CENTERS IN GAMMA IRRADIATED (RaO)x(SiO2)y SAMPLES WITH ADSORBED WATER 带吸附水的γ辐照(RaO)x(SiO2)y样品的顺磁中心

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-3-277-281

Z. Mansimov

引用次数: 0

SYNTHESIS AND POLYMERIZATION OF N-ALLYL-N-(β-CHLOR)ALLYL ETHANIC ACID n -烯丙基- n -(β-氯)烯丙基乙酸的合成与聚合

Chemical Problems Pub Date : 2021-01-01 DOI: 10.32737/2221-8688-2021-4-250-255

A. M. Garamanov, R. A. Akhmedova, B. Mamedov, A. F. Mamedova, N. Gusiev, M. Gurbanov

引用次数: 0

SYNTHESIS AND STUDY OF PHYSICOCHEMICAL PROPERTIES OF CAST IRON WITH FUNCTIONAL PROPERTIES FOR WORKING PART OF BIMETALLIC ROLLING PINS 双金属擀面杖工作件功能铸铁的合成及理化性能研究

Chemical Problems Pub Date : 2021-01-01 DOI: 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

引用次数: 0

REMOVAL OF RHODAMINE 6G DYE FROM WATER SOLUTION BY ALT-MALEIC ANHYDRIDE-STYRENE COPOLYMER, CROSS-LINKED WITH HEXAMETHYLENEDIAMINE 用六亚甲二胺交联的马来酸酐-苯乙烯共聚物从水溶液中去除罗丹明6g染料

Chemical Problems Pub Date : 2021-01-01 DOI: 10.32737/2221-8688-2021-4-203-214

O. Akperov, F.M. Kamranzadeh, E. Akperov

{"title":"REMOVAL OF RHODAMINE 6G DYE FROM WATER SOLUTION BY ALT-MALEIC ANHYDRIDE-STYRENE COPOLYMER, CROSS-LINKED WITH HEXAMETHYLENEDIAMINE","authors":"O. Akperov, F.M. Kamranzadeh, E. Akperov","doi":"10.32737/2221-8688-2021-4-203-214","DOIUrl":"https://doi.org/10.32737/2221-8688-2021-4-203-214","url":null,"abstract":"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.","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86808571","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