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Theoretical Foundations of Chemical Engineering最新文献

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Analysis of Designs and Prospects for Improvement of Tubular Heat Exchangers 列管式换热器的设计分析及改进展望
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-07-24 DOI: 10.1134/S004057952670034X
V. V. Chernyavskaya, M. G. Lagutkin, I. Yu. Golovanov
{"title":"Analysis of Designs and Prospects for Improvement of Tubular Heat Exchangers","authors":"V. V. Chernyavskaya,&nbsp;M. G. Lagutkin,&nbsp;I. Yu. Golovanov","doi":"10.1134/S004057952670034X","DOIUrl":"10.1134/S004057952670034X","url":null,"abstract":"<div><p>The article considers and analyzes typical designs of tubular (shell-and-tube and tube-in-tube) heat exchangers used in industry. Based on the identified shortcomings of typical designs in terms of specific performance indicators of heat exchangers, general promising directions for their improvement are formulated.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 1","pages":"217 - 222"},"PeriodicalIF":0.4,"publicationDate":"2026-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613697","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
Use of Mining Waste as Raw Materials for Producing Construction Materials of Various Applications 矿山废弃物作为生产各种用途建筑材料的原料
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-07-24 DOI: 10.1134/S0040579526700168
H. V. Gurgenyan, I. B. Khachanova, A. V. Martirosyan, A. E. Grigoryan, M. F. Kostandyan, N. K. Vardanyan
{"title":"Use of Mining Waste as Raw Materials for Producing Construction Materials of Various Applications","authors":"H. V. Gurgenyan,&nbsp;I. B. Khachanova,&nbsp;A. V. Martirosyan,&nbsp;A. E. Grigoryan,&nbsp;M. F. Kostandyan,&nbsp;N. K. Vardanyan","doi":"10.1134/S0040579526700168","DOIUrl":"10.1134/S0040579526700168","url":null,"abstract":"<p>New composite construction materials for various applications have been developed, including thermal insulation, structural–thermal insulation, and facing materials. Waste from aluminosilicate rocks, including tuffs, perlites, zeolites, basalts, and slags, was used as raw material. The physicochemical and mechanical properties of the raw materials and the resulting materials were studied. The competitiveness of the materials was enhanced by microwave thermal treatment.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 1","pages":"95 - 101"},"PeriodicalIF":0.4,"publicationDate":"2026-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613702","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
Catalytic Cracking with Adjustable Process Severity: An Optimum Scheme for the Petrochemical Variant with Increased Olefin Yield 过程强度可调的催化裂化：提高烯烃收率的石化变体的最佳方案
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-07-24 DOI: 10.1134/S0040579526700272
B. V. Andreev, R. V. Basov, A. S. Ustinov, O. G. Belyavskiy, I. R. Kvetko, S. V. Chesak, A. V. Anisimov
{"title":"Catalytic Cracking with Adjustable Process Severity: An Optimum Scheme for the Petrochemical Variant with Increased Olefin Yield","authors":"B. V. Andreev,&nbsp;R. V. Basov,&nbsp;A. S. Ustinov,&nbsp;O. G. Belyavskiy,&nbsp;I. R. Kvetko,&nbsp;S. V. Chesak,&nbsp;A. V. Anisimov","doi":"10.1134/S0040579526700272","DOIUrl":"10.1134/S0040579526700272","url":null,"abstract":"<p>A domestically developed and patented technology for controlled fluid catalytic cracking (FCC) process, employing proprietary bi-zeolite catalysts, is presented. It enables the creation of versatile catalytic cracking units suitable for operation either in the conventional fuel-oriented mode, maximizing the yield of high-octane components of commercial gasoline, or in a petrochemical mode with an increased yield of light olefins, in particular propylene, which is a key feedstock for petrochemical production. The features of the process technology are discussed, including the means of product yield distribution control and appropriate equipment layout of the reactor–regenerator unit for such installations.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 1","pages":"170 - 175"},"PeriodicalIF":0.4,"publicationDate":"2026-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613635","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
Modeling and Calculation of a Pneumatic Drying Tube Taking into Account Longitudinal Diffusion on the Drying Agent 考虑干燥剂纵向扩散的气动干燥管建模与计算
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-07-24 DOI: 10.1134/S0040579526700296
A. B. Golovanchikov, N. A. Merentsov, N. A. Prokhorenko, A. A. Shurak, M. V. Topilin
{"title":"Modeling and Calculation of a Pneumatic Drying Tube Taking into Account Longitudinal Diffusion on the Drying Agent","authors":"A. B. Golovanchikov,&nbsp;N. A. Merentsov,&nbsp;N. A. Prokhorenko,&nbsp;A. A. Shurak,&nbsp;M. V. Topilin","doi":"10.1134/S0040579526700296","DOIUrl":"10.1134/S0040579526700296","url":null,"abstract":"<div><p>Based on differential equations of material balance and mass transfer, equations for working and equilibrium lines are derived, taking into account longitudinal diffusion. An algorithm is developed, and a calculation example is presented, compared with a calculation using a standard algorithm that does not take longitudinal diffusion into account on the drying agent—air. It is shown that longitudinal diffusion at the Peclet number Pe &lt; 3.5 leads to the necessity to increase the height and, accordingly, the volume of the drying tube by 10% or more, at Pe &lt; 1—by 40% or more. In the ideal mixing regime, when Pe → 0 (with the longitudinal diffusion coefficient <i>D</i><sub>l</sub> → ∞), the increase in height and volume is more than 600%. Tables and graphs of the dependencies of the process parameters are presented: temperature, enthalpy, humidity of the dried particles, moisture content, etc. The obtained results are shown in the traditional oblique <i>J–x</i>-diagram of Ramzin and additionally in the rectangular Euler coordinate system, clearly demonstrating the graphs of the working and equilibrium lines of the drying process with and without taking into account the longitudinal diffusion.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 1","pages":"183 - 193"},"PeriodicalIF":0.4,"publicationDate":"2026-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613638","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
Synthesis and Luminescence Characteristics of Phosphors Based on Rare-Earth Phosphates and Polyphosphates 基于稀土磷酸盐和多磷酸盐的荧光粉的合成及其发光特性
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-07-24 DOI: 10.1134/S0040579526700260
N. I. Steblevskaya, M. V. Belobeletskaya, M. A. Medkov
{"title":"Synthesis and Luminescence Characteristics of Phosphors Based on Rare-Earth Phosphates and Polyphosphates","authors":"N. I. Steblevskaya,&nbsp;M. V. Belobeletskaya,&nbsp;M. A. Medkov","doi":"10.1134/S0040579526700260","DOIUrl":"10.1134/S0040579526700260","url":null,"abstract":"<p>A low-temperature extraction–pyrolytic method is proposed for the synthesis of phosphors based on rare-earth phosphates: LnPO<sub>4</sub> (where Ln = Eu, Eu + Y, Tb, Tb + Gd, and Tb + Nd), Eu<sub>3</sub>PO<sub>7</sub>, Eu(PO<sub>3</sub>)<sub>3</sub>, Eu(PO<sub>3</sub>)<sub>3</sub>:Eu<sup>2+</sup>, Tb(PO<sub>3</sub>)<sub>3</sub>, La<sub>1–<i>х</i></sub>Tb<sub><i>х</i></sub>P<sub>3</sub>O<sub>9</sub> (<i>х</i> = 0.05, 0.10, 0.20, 0.30, and 0.40), La<sub>0.8</sub>Ce<sub>0.15</sub>Tb<sub>0.05</sub>PO<sub>4</sub>, La<sub>0.8</sub>Ce<sub>0.15</sub>Tb<sub>0.05</sub>(PO<sub>3</sub>), NaY<sub>1–<i>х</i></sub>Eu<sub><i>x</i></sub>P<sub>2</sub>O<sub>7</sub>, and NaY<sub>1–<i>х</i></sub>Tb<sub><i>x</i></sub>P<sub>2</sub>O<sub>7</sub> (<i>х</i> = 0, 0.025, 0.05, 0.075, and 0.1). The compounds are characterized by X-ray powder diffraction analysis and IR and luminescence spectroscopy. A comparative analysis is made of the spectral and luminescence characteristics of the Eu<sup>3+</sup> and Tb<sup>3+</sup> ions in simple and doped phosphate phosphors. It is shown that the luminescence intensity of Eu<sup>3+</sup> and Tb<sup>3+</sup> in phosphates increases in the presence of activator ions.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 1","pages":"163 - 169"},"PeriodicalIF":0.4,"publicationDate":"2026-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613639","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
Influence of Calcined Diatomite on Hydration Processes and the Strength of Cement 煅烧硅藻土对水泥水化过程及强度的影响
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-07-24 DOI: 10.1134/S0040579526700181
K. G. Grigoryan, A. A. Khachatryan, L. G. Baginova, K. N. Edilyan, T. R. Abgaryan, S. M. Yayloyan, S. M. Ayrapetyan
{"title":"Influence of Calcined Diatomite on Hydration Processes and the Strength of Cement","authors":"K. G. Grigoryan,&nbsp;A. A. Khachatryan,&nbsp;L. G. Baginova,&nbsp;K. N. Edilyan,&nbsp;T. R. Abgaryan,&nbsp;S. M. Yayloyan,&nbsp;S. M. Ayrapetyan","doi":"10.1134/S0040579526700181","DOIUrl":"10.1134/S0040579526700181","url":null,"abstract":"<p>The effect of calcined diatomite from the Dzhradzor deposit in Armenia on the strength and hydration processes of Portland cement has been determined. Calcined diatomite intensifies cement hydration and contributes to strengthening of cement-based compositions. The material containing 2 wt % diatomite shows a marked increase in strength. A further increase in diatomite content in the compositions leads to a decrease in the strength of the materials.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 1","pages":"102 - 106"},"PeriodicalIF":0.4,"publicationDate":"2026-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613692","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 Processing of Molybdenum Concentrate by Hydrometallurgical Method 湿法冶金法处理钼精矿研究
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-07-24 DOI: 10.1134/S004057952670017X
E. M. Nazaryan, A. G. Arustamyan, A. A. Akopyan, E. S. Aghamyan, A. M. Arakelyan, J. S. Mazmanyan, N. B. Knyazyan
{"title":"Study of Processing of Molybdenum Concentrate by Hydrometallurgical Method","authors":"E. M. Nazaryan,&nbsp;A. G. Arustamyan,&nbsp;A. A. Akopyan,&nbsp;E. S. Aghamyan,&nbsp;A. M. Arakelyan,&nbsp;J. S. Mazmanyan,&nbsp;N. B. Knyazyan","doi":"10.1134/S004057952670017X","DOIUrl":"10.1134/S004057952670017X","url":null,"abstract":"<p>Processes for hydrometallurgical treatment of molybdenum concentrate by leaching with a 30% sodium hypochlorite (NaOCl) solution at low temperatures were studied. Molybdenum transfers into solution as sodium molybdate (Na<sub>2</sub>MoO<sub>4</sub>). Sulfur also transfers into solution as sodium sulfate (Na<sub>2</sub>SO<sub>4</sub>).</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 1","pages":"107 - 110"},"PeriodicalIF":0.4,"publicationDate":"2026-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613695","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 MgCl2–MgCl2⋅4CO(NH2)2–H2O system at temperatures 0 to –46°C 温度为0 ~ -46℃时MgCl2-MgCl2·4CO(NH2) 2-H2O体系的相平衡
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-07-24 DOI: 10.1134/S0040579526700089
E. A. Frolova, G. E. Nikiforova, D. F. Kondakov
{"title":"Phase Equilibria in Sections of the MgCl2–MgCl2⋅4CO(NH2)2–H2O system at temperatures 0 to –46°C","authors":"E. A. Frolova,&nbsp;G. E. Nikiforova,&nbsp;D. F. Kondakov","doi":"10.1134/S0040579526700089","DOIUrl":"10.1134/S0040579526700089","url":null,"abstract":"<p>Phase equilibria in sections of the MgCl<sub>2</sub>–MgCl<sub>2</sub>⋅4CO(NH<sub>2</sub>)<sub>2</sub>–H<sub>2</sub>O system at temperatures from 0 to –46°C were studied. The earlier assumption that the formation of the low-temperature eutectic in the MgCl<sub>2</sub>–CO(NH<sub>2</sub>)<sub>2</sub>–H<sub>2</sub>O system is caused by the compound MgCl<sub>2</sub>⋅4CO(NH<sub>2</sub>)<sub>2</sub> was confirmed. Several low-temperature eutectic mixtures promising for the development of deicing reagents were identified.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 1","pages":"42 - 45"},"PeriodicalIF":0.4,"publicationDate":"2026-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613698","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 Corrosion Resistance of Stainless Steel and Titanium Under the Influence of Ultrasonic Vibrations 超声振动作用下不锈钢和钛的耐蚀性研究
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-07-24 DOI: 10.1134/S0040579526700302
A. V. Kamler, E. R. Magdeev, I. A. Gamilov, V. M. Bayazitov, R. V. Nikonov, F. A. Mezenov
{"title":"Study of Corrosion Resistance of Stainless Steel and Titanium Under the Influence of Ultrasonic Vibrations","authors":"A. V. Kamler,&nbsp;E. R. Magdeev,&nbsp;I. A. Gamilov,&nbsp;V. M. Bayazitov,&nbsp;R. V. Nikonov,&nbsp;F. A. Mezenov","doi":"10.1134/S0040579526700302","DOIUrl":"10.1134/S0040579526700302","url":null,"abstract":"<div><p>Due to the specific features of horizontal wells, the methods used in vertical and deviated wells to increase oil recovery, including chemical methods, are either economically inefficient or inapplicable. The application of ultrasonic vibrations makes it possible to intensify and accelerate a number of chemical reactions, so the development of a method to enhance oil recovery based on combining chemical methods of increasing oil recovery and ultrasonic intensification should increase the efficiency of horizontal wells. However, this method requires the development of a downhole/submersible ultrasonic transducer for aggressive environments. The corrosion resistance of stainless steel and titanium samples under the influence of ultrasonic vibrations was investigated. It was found that using VT1‑0 grade titanium as the structural material for the submersible transducer allows achieving the lowest corrosion rates even under the most aggressive conditions in the presence of a titanium corrosion inhibitor; however, other components of oilfield equipment that cannot be made from this material are subjected to increased corrosion stress. Based on the results obtained, stainless steel is recommended as the material for manufacturing the submersible transducer instead of titanium and a titanium corrosion inhibitor.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 1","pages":"194 - 199"},"PeriodicalIF":0.4,"publicationDate":"2026-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613842","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
Use of Sol–Gel Technologies for the Synthesis of Yttrium Stannate with a Pyrochlore Structure 溶胶-凝胶技术合成具有焦绿盐结构的锡酸钇
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-07-24 DOI: 10.1134/S0040579526700065
M. A. Ryumin, G. E. Nikiforova, D. F. Kondakov
{"title":"Use of Sol–Gel Technologies for the Synthesis of Yttrium Stannate with a Pyrochlore Structure","authors":"M. A. Ryumin,&nbsp;G. E. Nikiforova,&nbsp;D. F. Kondakov","doi":"10.1134/S0040579526700065","DOIUrl":"10.1134/S0040579526700065","url":null,"abstract":"<p>Yttrium stannate with a pyrochlore structure was synthesized by the sol–gel method using three tin sources. A hypothesis on the possible stages of the sol–gel process is proposed.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 1","pages":"31 - 33"},"PeriodicalIF":0.4,"publicationDate":"2026-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613583","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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