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Conversion of Sulfocationite from ({text{NH}}_{4}^{ + }) Form to H+ Form 硫化矿({text{NH}}_{4}^{ + })形态向H+形态的转化
IF 0.6 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-09-21 DOI: 10.1134/S0040579525700526
E. P. Lokshin, O. A. Tareeva
{"title":"Conversion of Sulfocationite from ({text{NH}}_{4}^{ + }) Form to H+ Form","authors":"E. P. Lokshin,&nbsp;O. A. Tareeva","doi":"10.1134/S0040579525700526","DOIUrl":"10.1134/S0040579525700526","url":null,"abstract":"<p>The conversion of sulfocationite from the <span>({text{NH}}_{4}^{ + })</span> form to the H<sup>+</sup> form is studied. It is shown that when using concentrated solutions of strong mineral acids (nitric, sulfuric), the conversion is ineffective. In order to achieve efficient conversion to the H<sup>+</sup> form, it is recommended to treat the sulfocationite in the <span>({text{NH}}_{4}^{ + })</span> form in two stages: first with a sodium salt solution to convert it to the intermediate Na<sup>+</sup> form, then with a strong mineral acid solution to obtain the sorbent in the H<sup>+</sup> form. An equation is proposed for calculating the specific reagent consumption required to achieve a certain degree of the sorbent conversion.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"59 2","pages":"314 - 318"},"PeriodicalIF":0.6,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study of the Rheological Properties of Polymer Elastomer Compounds as a Function of Temperature 高分子弹性体化合物流变性能随温度变化的研究
IF 0.6 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-09-21 DOI: 10.1134/S0040579525700514
R. A. Alekhina, A. S. Sviridov, S. P. Tuzhilin
{"title":"Study of the Rheological Properties of Polymer Elastomer Compounds as a Function of Temperature","authors":"R. A. Alekhina,&nbsp;A. S. Sviridov,&nbsp;S. P. Tuzhilin","doi":"10.1134/S0040579525700514","DOIUrl":"10.1134/S0040579525700514","url":null,"abstract":"<p>Like any technical system, robotic milking units require appropriate technical servicing due to the wear and subsequent failure of functional system components. At present, the import of spare parts into the country has been discontinued, including teat cup liners and elastomer components of the pump line, which are manufactured from elastomer compounds. The primary technological parameter of any compound is its viscosity, which affects processability. This study examined the viscosity of several grades of silicone compounds and derived mathematical relationships describing the dependence of compound viscosity on temperature.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"59 2","pages":"308 - 313"},"PeriodicalIF":0.6,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Preparation and Characterization of Pickering Emulsions of Epoxy Oligomer Stabilized by Aerosil Particles 悬浮颗粒稳定环氧低聚物酸洗乳剂的制备与表征
IF 0.6 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-09-21 DOI: 10.1134/S0040579525700538
V. D. Koshevar, V. G. Shkadretsova, V. Yu. Krasutskii
{"title":"Preparation and Characterization of Pickering Emulsions of Epoxy Oligomer Stabilized by Aerosil Particles","authors":"V. D. Koshevar,&nbsp;V. G. Shkadretsova,&nbsp;V. Yu. Krasutskii","doi":"10.1134/S0040579525700538","DOIUrl":"10.1134/S0040579525700538","url":null,"abstract":"<p>Stable Pickering emulsions of the first type based on the epoxy oligomer CHS-EPOXX 530 were obtained in the presence of micro- and nanosized aerosil particles, exhibiting resistance to both coagulation and sedimentation. The dependences of rheological properties on oligomer concentration, phase volume ratio, and content of the solid stabilizing powder (aerosil) were determined. In particular, increasing the aerosil concentration led to enhanced interparticle interactions, which caused an increase in the effective viscosity of the emulsions and subsequent breakdown of the formed coagulation–thixotropic structure under low shear deformation, followed by quasi-Newtonian flow behavior. The influence of these factors on the physicomechanical properties of the resulting coatings and films produced from these emulsions was also established. The data obtained confirm the good film-forming properties of such emulsions and support their potential use as polymeric film formers in the production of paint and varnish materials containing a limited amount of organic solvents, as well as in two-component carbon fiber-reinforced adhesive formulations for the repair of structural concrete elements.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"59 2","pages":"319 - 326"},"PeriodicalIF":0.6,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Phase Equilibria in Sections of the Magnesium Chloride–Urea–Water System at Negative Temperatures 负温度下氯化镁-尿素-水体系各部分的相平衡
IF 0.6 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-09-21 DOI: 10.1134/S0040579525700459
E. A. Frolova, D. F. Kondakov
{"title":"Phase Equilibria in Sections of the Magnesium Chloride–Urea–Water System at Negative Temperatures","authors":"E. A. Frolova,&nbsp;D. F. Kondakov","doi":"10.1134/S0040579525700459","DOIUrl":"10.1134/S0040579525700459","url":null,"abstract":"<p>Phase equilibria in sections of the MgCl<sub>2</sub>–CO(NH<sub>2</sub>)<sub>2</sub>–H<sub>2</sub>O system at temperatures below 0°C are studied. It is established that the introduction of urea into the MgCl<sub>2</sub>–H<sub>2</sub>O system leads to the formation of low-temperature eutectics with crystallization temperatures down to –51°C, which significantly expands the temperature range of application of magnesium chloride as an anti-icing material. The identified compositions are promising for the development of new anti-icing materials on their basis.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"59 2","pages":"264 - 267"},"PeriodicalIF":0.6,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Calculation and Petrographic Determination of the Mineral Composition of Igneous Rock Samples 火成岩样品矿物组成的计算与岩石学测定
IF 0.6 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-09-21 DOI: 10.1134/S004057952570040X
E. I. Berbekova, E. N. Pechenkina, S. V. Fomichev, V. A. Krenev, D. F. Kondakov
{"title":"Calculation and Petrographic Determination of the Mineral Composition of Igneous Rock Samples","authors":"E. I. Berbekova,&nbsp;E. N. Pechenkina,&nbsp;S. V. Fomichev,&nbsp;V. A. Krenev,&nbsp;D. F. Kondakov","doi":"10.1134/S004057952570040X","DOIUrl":"10.1134/S004057952570040X","url":null,"abstract":"<p>The mineral composition of andesibasalt from the northeastern slope of the Urals, basalt-dolerite (Kanzafarov quarry, Chelyabinsk oblast), and gabbro (Navolok deposit, Republic of Karelia) was calculated by computer-based physicochemical modeling and determined experimentally. A comparison of the results and capabilities of different methods for determining the mineral composition of rocks from the gabbro–basalt group is presented.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"59 2","pages":"233 - 237"},"PeriodicalIF":0.6,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Computer Modeling of Static and Dynamic Separation Modes of Direct Synthesis Products of Methylchlorosilanes Using a Three-Section Column 三段塔直接合成甲基氯硅烷产品静态和动态分离模式的计算机模拟
IF 0.6 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-09-21 DOI: 10.1134/S004057952570068X
O. V. Pererva, D. V. Klushin, A. V. Pankrushina, O. P. Shumakova
{"title":"Computer Modeling of Static and Dynamic Separation Modes of Direct Synthesis Products of Methylchlorosilanes Using a Three-Section Column","authors":"O. V. Pererva,&nbsp;D. V. Klushin,&nbsp;A. V. Pankrushina,&nbsp;O. P. Shumakova","doi":"10.1134/S004057952570068X","DOIUrl":"10.1134/S004057952570068X","url":null,"abstract":"<p>Computer modeling was carried out for the primary separation of direct synthesis products of methylchlorosilanes. The developed control scheme for process parameters under feed flow fluctuations ensures the production of stable-quality products: 99.963 ± 0.004 wt % methyl chloride in the recycled methyl chloride and 0.0475 ± 0.0015 wt % methyl chloride in the crude methylchlorosilanes.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"59 2","pages":"433 - 442"},"PeriodicalIF":0.6,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Kinetics of Phosphate Ion Sorption by Layered Double Magnesium Aluminum Hydroxide 层状双层氢氧化铝镁吸附磷酸离子的动力学研究
IF 0.6 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-09-21 DOI: 10.1134/S0040579525700411
D. V. Maiorov
{"title":"Kinetics of Phosphate Ion Sorption by Layered Double Magnesium Aluminum Hydroxide","authors":"D. V. Maiorov","doi":"10.1134/S0040579525700411","DOIUrl":"10.1134/S0040579525700411","url":null,"abstract":"<p>The paper presents the results of studies of the sorption properties of layered double hydroxide of the composition Mg<sub>4</sub>Al<sub>2</sub>(OH)<sub>12</sub>CO<sub>3</sub>⋅3H<sub>2</sub>O, obtained by the solid-phase interaction method, with respect to the <span>({text{PO}}_{4}^{{3 - }})</span> ion. It is found that the sorption process is most adequately described by the Langmuir monomolecular adsorption equation, and its kinetics is described by a pseudo-first-order equation. The activation energy of the process is determined, based on which is concluded that the process occurs in the diffusion region.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"59 2","pages":"238 - 245"},"PeriodicalIF":0.6,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The First Step of the Pyrolytic Decomposition of Methylchlorosilane 甲基氯硅烷热解分解的第一步
IF 0.6 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-09-21 DOI: 10.1134/S0040579525700484
D. V. Sidorov, A. A. Grunin, A. D. Kirilin, A. A. Shavnev
{"title":"The First Step of the Pyrolytic Decomposition of Methylchlorosilane","authors":"D. V. Sidorov,&nbsp;A. A. Grunin,&nbsp;A. D. Kirilin,&nbsp;A. A. Shavnev","doi":"10.1134/S0040579525700484","DOIUrl":"10.1134/S0040579525700484","url":null,"abstract":"<p>The article is devoted to the theoretical study of chemical reactions occurring in the first step of the pyrolytic decomposition of the methylchlorosilane molecule. The most probable decomposition reactions of methylchlorosilane and their mechanisms were identified, a thermodynamic calculation of the products and transition state structures at different temperatures was performed, and the equilibrium and rate constants of the reactions were calculated.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"59 2","pages":"286 - 292"},"PeriodicalIF":0.6,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Modification of the Mineral Composition of Metallurgical Sludges during Gas-Phase Treatment in Nitriding Media. Part I. Fly Ash from the Concentration Plant of the Norilsk Mining and Metallurgical Combine 氮化介质气相处理中冶金污泥矿物组成的改变。第一部分：诺里尔斯克矿冶联合公司选矿厂的粉煤灰
IF 0.6 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-09-21 DOI: 10.1134/S0040579525700605
K. V. Martynov, Yu. M. Nevolin, S. A. Kulyukhin
{"title":"Modification of the Mineral Composition of Metallurgical Sludges during Gas-Phase Treatment in Nitriding Media. Part I. Fly Ash from the Concentration Plant of the Norilsk Mining and Metallurgical Combine","authors":"K. V. Martynov,&nbsp;Yu. M. Nevolin,&nbsp;S. A. Kulyukhin","doi":"10.1134/S0040579525700605","DOIUrl":"10.1134/S0040579525700605","url":null,"abstract":"<p>Phase transformations in fly ash from the concentration plant of the Norilsk Mining and Metallurgical Combine were examined by X-ray microanalysis and X-ray diffraction phase analysis during gas-phase treatment in a HNO<sub>3</sub> (vapor)–air atmosphere, followed by treatment of the resulting products with water.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"59 2","pages":"377 - 385"},"PeriodicalIF":0.6,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Application of a Portable Proton NMR Flow Analyzer for Rapid Monitoring of Petroleum Product Properties and Water Contamination 便携式质子核磁共振流量分析仪在石油产品性质和水污染快速监测中的应用
IF 0.6 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-09-21 DOI: 10.1134/S0040579525700721
R. S. Kashaev, V. O. Kozelkova, Nguyễn Đức Anh, O. V. Kozelkov
{"title":"Application of a Portable Proton NMR Flow Analyzer for Rapid Monitoring of Petroleum Product Properties and Water Contamination","authors":"R. S. Kashaev,&nbsp;V. O. Kozelkova,&nbsp;Nguyễn Đức Anh,&nbsp;O. V. Kozelkov","doi":"10.1134/S0040579525700721","DOIUrl":"10.1134/S0040579525700721","url":null,"abstract":"<p>The aim of this work is to describe the design and application of a compact portable proton nuclear magnetic resonance (NMR) flow analyzer for manual and stationary rapid monitoring of crude oil and wastewater characteristics along production lines. The advantages of the NMR method and instruments based on it over the closest analogs are discussed. A brief overview of the theory of proton NMR relaxometry, the measurement technique, and the metrology of the method is given. The design and main components of the analyzer are described, as well as the technologies for representative sampling and instrument control. Correlations between hydrocarbon characteristics and proton NMR relaxation parameters were established to support the development of flow-based rapid monitoring technologies using these parameters. Equations were obtained linking proton NMR parameters with the properties of chemical products, including molecular weight and oil concentration in wastewater.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"59 2","pages":"463 - 470"},"PeriodicalIF":0.6,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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