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Theoretical Foundations of Chemical Engineering最新文献

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Study of Kinetic Processes of the Dislocation of Iron-Containing Sulfates of Aggregated Ore 矿石中含铁硫酸盐位错动力学过程研究
IF 0.7 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-03-23 DOI: 10.1134/S0040579525600706
V. P. Meshalkin, M. I. Dli, V. I. Bobkov, A. A. Bykov
{"title":"Study of Kinetic Processes of the Dislocation of Iron-Containing Sulfates of Aggregated Ore","authors":"V. P. Meshalkin,&nbsp;M. I. Dli,&nbsp;V. I. Bobkov,&nbsp;A. A. Bykov","doi":"10.1134/S0040579525600706","DOIUrl":"10.1134/S0040579525600706","url":null,"abstract":"<p>The authors study physicochemical characteristics of the kinetics of agglomerated charge dissociation at different temperatures conditions with impurities added during the melting process. The level of oxygen in the gas, the size of the ore, and the added impurities, are the main factors that determine the rate of sulfate dissociation and allow the viscosity and melting point of the agglomeration melt to be changed. The study is based on high-temperature derivatography, with which different ranges of temperature are considered and the rates of dissociation of minerals are determined. The experimental technique developed for studying the kinetics of sulfate dissociation can be used to study the thermophysical patterns of chemical and metallurgical calcination in a large group of iron-containing ore materials.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 5","pages":"1630 - 1639"},"PeriodicalIF":0.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676306","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
Sol-Gel Powder Synthesis for Fabrication of Zircon-Based Ceramic Composites in a Two-Stage Microreactor 在两级微反应器中制备锆基陶瓷复合材料的溶胶-凝胶粉末
IF 0.7 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-03-23 DOI: 10.1134/S0040579525600883
V. L. Ugolkov, Yu. S. Kudryashova, A. V. Osipov, L. P. Mezentseva, I. V. Makusheva, R. Sh. Abiev
{"title":"Sol-Gel Powder Synthesis for Fabrication of Zircon-Based Ceramic Composites in a Two-Stage Microreactor","authors":"V. L. Ugolkov,&nbsp;Yu. S. Kudryashova,&nbsp;A. V. Osipov,&nbsp;L. P. Mezentseva,&nbsp;I. V. Makusheva,&nbsp;R. Sh. Abiev","doi":"10.1134/S0040579525600883","DOIUrl":"10.1134/S0040579525600883","url":null,"abstract":"<p>The sol-gel synthesis of zircon, zirconium oxide, and composite powder precursors based on them has been performed in two ways: reverse precipitation and the microreactor method in a two-stage apparatus with intensively swirled reagent flows. A comparison of the synthesis results at all stages is carried out—(1 ‒ <i>x</i>)(H<sub>2</sub>SiO<sub>3</sub>‒ZrO(OH)<sub>2</sub>)‒<i>x</i>ZrO(OH)<sub>2</sub> precursor powders, after calcination at 850°С, as well as after sintering powders in the temperature range of 1000‒1300°С. The thermal behavior of the initial nanosized compositions is studied using differential scanning calorimetry and thermogravimetry and dilatometry methods. The temperature coefficients of linear expansion of ceramic samples are estimated. Microhardness values for the (1 – <i>x</i>)ZrSiO<sub>4</sub>–<i>x</i>ZrO<sub>2</sub> ceramic composites are given with different backgrounds.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 6","pages":"1819 - 1832"},"PeriodicalIF":0.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676395","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
Capture of Fine Particles by a Multivortex Separator in a Paint Drying Chamber 涂料干燥室中多涡分离器对细颗粒的捕获
IF 0.7 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-03-23 DOI: 10.1134/S0040579525600421
V. E. Zinurov, R. Ya. Bikkulov, A. V. Dmitriev, A. A. Abdullina
{"title":"Capture of Fine Particles by a Multivortex Separator in a Paint Drying Chamber","authors":"V. E. Zinurov,&nbsp;R. Ya. Bikkulov,&nbsp;A. V. Dmitriev,&nbsp;A. A. Abdullina","doi":"10.1134/S0040579525600421","DOIUrl":"10.1134/S0040579525600421","url":null,"abstract":"<p>Paint spraying and drying booths are widely used in various industries. During spraying paint and varnish materials, a significant amount of contaminants—paint mist particles—is generated inside the booth, making their capture an important task. Failure to address this issue may lead to explosive hazards, violations of sanitary and environmental regulations, defects in coated parts, and other negative consequences. Ceiling and floor filters are commonly used for this purpose, but they are typically imported and require regular replacement, usually once a month. Therefore, extending their service life is an urgent task. This paper aims to develop a separation device to extend the service life of floor and ceiling filters in a paint-drying booth and enhance the overall efficiency of fine particle capture. The article presents the design of a multivortex separator and describes its operating principle. The direct application of the multivortex separator in a paint-spraying drying chamber at Kamatek Ltd. is considered. To increase filter longevity, it is proposed to install the separator upstream of either the floor or ceiling filters. The efficiency of the multivortex separator was calculated for two installation configurations within the paint-drying booth. Based on the efficiency calculations, the following conclusions were drawn: when the separator is installed upstream of the floor filters (with an inlet velocity of 0.3 m/s), its efficiency averages 45% for particles sized 1 to 10 µm; when installed upstream of the ceiling filters in the narrow section (with an inlet velocity of 5 m/s), its efficiency averages 88% for particles of the same size range. In practical terms, installing the multivortex separator before the ceiling fine filters is more effective, as it achieves higher efficiency with minimal capital investment.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 5","pages":"1790 - 1793"},"PeriodicalIF":0.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676372","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 Influence of Surface Tension of Intrapore Fluid on the Structural and Surface Properties of Silicon Dioxide Obtained from Nepheline-Containing Raw Materials 孔内流体表面张力对含钠原料制备二氧化硅结构和表面性能的影响
IF 0.7 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-03-23 DOI: 10.1134/S0040579525601189
D. V. Mayorov
{"title":"The Influence of Surface Tension of Intrapore Fluid on the Structural and Surface Properties of Silicon Dioxide Obtained from Nepheline-Containing Raw Materials","authors":"D. V. Mayorov","doi":"10.1134/S0040579525601189","DOIUrl":"10.1134/S0040579525601189","url":null,"abstract":"<p>The article presents the results of research on the effect of intrapore fluid surface tension on the structural and surface properties (specific surface area, pore volume, and pore size distribution) of silica (SiO<sub>2</sub>) synthesized via the acid decomposition of nepheline mineral raw materials. The synthesized samples were analyzed using chemical and X-ray diffraction (XRD) methods, as well as the Brunauer–Emmett–Teller (BET) method for determining specific surface area and the Barrett–Joyner–Halenda (BJH) method for pore size distribution. Equations were obtained linking the specific surface area, pore volume, and pore diameter of the synthesized SiO<sub>2</sub> samples to the surface tension of the intrapore medium. It was shown that replacing the aqueous medium in the pore space with an organic liquid before drying significantly (~2 times) increases the adsorption monolayer capacity and affects the pore volume distribution. Based on the specific surface capacity of SiO<sub>2</sub> samples and Gibbs free energy (Δ<i>G</i>°) changes during sorption, it was concluded that the synthesis method does not significantly affect the physicochemical properties of their surfaces (the type and number of sorption sites per unit area) or the nitrogen sorption mechanism.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 5","pages":"1776 - 1783"},"PeriodicalIF":0.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676409","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
Temperature Dependence of Henry Constants of Radon Adsorption on Activated Carbons 氡在活性炭上吸附的亨利常数的温度依赖性
IF 0.7 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-03-23 DOI: 10.1134/S0040579525600731
E. P. Magomedbekov, A. O. Merkushkin, A. V. Obruchikov, V. S. Pokalchuk, N. N. Kulov
{"title":"Temperature Dependence of Henry Constants of Radon Adsorption on Activated Carbons","authors":"E. P. Magomedbekov,&nbsp;A. O. Merkushkin,&nbsp;A. V. Obruchikov,&nbsp;V. S. Pokalchuk,&nbsp;N. N. Kulov","doi":"10.1134/S0040579525600731","DOIUrl":"10.1134/S0040579525600731","url":null,"abstract":"<p>Layer-by-layer gamma-spectrometric measurements of sorbent activity are used to calculate Henry constants and determine parameters of their temperature dependence for dynamic radon adsorption on activated carbon of grades AG-3, VSK-5, SKT-3, and NWC 12x40 in the 20 to 60°C range of temperatures. The logarithm of the Henry constant is a linear function of the inverse temperature throughout the considered range. The linearity of the obtained dependences allows the values of Henry constants to be calculated at temperatures outside the range studied experimentally. The isoteric heat of adsorption of radon on the activated carbon of the considered grades is calculated. The isosteric heat of adsorption grows monotonically upon raising the atomic number of the adsorbate in the series of inert gases Ar–Kr–Xe–Rn, indicating an increase in the sorption capacity of activated carbon in this series.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 5","pages":"1662 - 1670"},"PeriodicalIF":0.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676309","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
Theoretical and Experimental Analysis of Granulation in a Fluidized Bed of Diammonium Sulfate Solutions 硫酸二铵溶液流化床造粒的理论与实验分析
IF 0.7 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-03-23 DOI: 10.1134/S0040579525600834
O. M. Flisyuk, N. A. Martsulevich, V. P. Meshalkin, I. G. Likhachev
{"title":"Theoretical and Experimental Analysis of Granulation in a Fluidized Bed of Diammonium Sulfate Solutions","authors":"O. M. Flisyuk,&nbsp;N. A. Martsulevich,&nbsp;V. P. Meshalkin,&nbsp;I. G. Likhachev","doi":"10.1134/S0040579525600834","DOIUrl":"10.1134/S0040579525600834","url":null,"abstract":"<p>This paper presents a mathematical model of the granulation process in a fluidized bed of diammonium sulfate solutions. Expressions are derived for calculating granule growth, the density function of granule distribution at the apparatus outlet, and the distribution variance as a function of external recycle characteristics and process parameters. The adequacy of the proposed mathematical description to the actual process is demonstrated.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 5","pages":"1569 - 1574"},"PeriodicalIF":0.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676253","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 New Drying Processes That Use Supercritical Fluids 模拟使用超临界流体的新型干燥过程
IF 0.7 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-03-23 DOI: 10.1134/S004057952560072X
P. Yu. Tsygankov, N. V. Menshutina
{"title":"Modeling New Drying Processes That Use Supercritical Fluids","authors":"P. Yu. Tsygankov,&nbsp;N. V. Menshutina","doi":"10.1134/S004057952560072X","DOIUrl":"10.1134/S004057952560072X","url":null,"abstract":"<p>Mathematical modeling is used to show that a rise in temperature intensifies both convective and diffusion transport. An intensification of convective transport is observed along with an increase in the consumption of carbon dioxide. The effect of convective transport in the free volume of a dryer and the boundary layer of its plate is especially noticeable at the first stage of supercritical drying. Raising the pressure has no appreciable effect on the rate of supercritical drying.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 5","pages":"1648 - 1661"},"PeriodicalIF":0.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676308","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
Dynamics of Two-Stage Catalytic Reactions with Marcelin-de Donde Kinetics in an Open System 开放体系中两级催化反应动力学及Marcelin-de - Donde动力学
IF 0.7 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-03-23 DOI: 10.1134/S0040579525600925
N. I. Koltsov
{"title":"Dynamics of Two-Stage Catalytic Reactions with Marcelin-de Donde Kinetics in an Open System","authors":"N. I. Koltsov","doi":"10.1134/S0040579525600925","DOIUrl":"10.1134/S0040579525600925","url":null,"abstract":"<p>The dynamics of chemical reactions depends on the kinetic law (KL) and is characterized by relaxation times, making it possible to determine the speed and duration of their implementation. M.I. Temkin analyzed the relaxation time of the simplest two-stage catalytic reaction proceeding quasi-stationary in an open isothermical system according to the ideal law of mass action. This article examines the features of the relaxation processes of two-stage catalytic reactions, proceeding according to the nonideal kinetic Marcelin-De Donde (MDD) law, which relates reaction rates to the chemical potentials of the regents.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 6","pages":"1875 - 1882"},"PeriodicalIF":0.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676506","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 Favipiravir Micronization by Rapid Expansion of a Supercritical Solution 超临界溶液快速膨胀法匹拉韦微粉化研究
IF 0.7 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-03-23 DOI: 10.1134/S0040579525600846
P. Yu. Tsygankov, A. Yu. Kislinskaya, E. A. Pashkin, N. V. Men’shutina
{"title":"Study of Favipiravir Micronization by Rapid Expansion of a Supercritical Solution","authors":"P. Yu. Tsygankov,&nbsp;A. Yu. Kislinskaya,&nbsp;E. A. Pashkin,&nbsp;N. V. Men’shutina","doi":"10.1134/S0040579525600846","DOIUrl":"10.1134/S0040579525600846","url":null,"abstract":"<p>Rapid expansion of supercritical solutions for the preparation of nano- and microparticles is studied. The theoretical analysis of this process considers the mechanism of particle formation involving solution supersaturation, nucleation, condensation, and coagulation. The size of the obtained particles is shown to be influenced by the starting concentration of the micronized substance and the structural features of the device, in addition to pressure and temperature. The experimental section describes a laboratory device for rapid expansion of supercritical solutions. Experiments on micronization of favipiravir are carried out at different temperatures and pressures. The average size of the starting particles is 12.5 µm; micronization afforded particles with a size in the range from 0.45 to 1.07 µm, depending on the temperature and pressure. Simultaneous increase in the temperature and pressure is found to result in a decrease in the particle size. X-ray powder diffraction analysis shows the obtained favipiravir particles to have an amorphous structure.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 5","pages":"1584 - 1593"},"PeriodicalIF":0.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676364","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
Mechanism of Degradation of Polymer Fuel Cell Cathode Catalyst: Research and Modeling 聚合物燃料电池阴极催化剂降解机理的研究与模拟
IF 0.7 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-03-23 DOI: 10.1134/S0040579525601001
E. M. Koltsova, V. A. Vasilenko, A. V. Zhensa, V. A. Bogdanovskaya, M. V. Radina
{"title":"Mechanism of Degradation of Polymer Fuel Cell Cathode Catalyst: Research and Modeling","authors":"E. M. Koltsova,&nbsp;V. A. Vasilenko,&nbsp;A. V. Zhensa,&nbsp;V. A. Bogdanovskaya,&nbsp;M. V. Radina","doi":"10.1134/S0040579525601001","DOIUrl":"10.1134/S0040579525601001","url":null,"abstract":"<p>The article presents a mathematical model of the degradation of the active surface of a platinum catalyst in a hydrogen–air (oxygen) fuel cell with a proton-conducting polymer electrolyte. The mathematical model is a system of integral–differential equations solved by the finite-difference method. The model takes into account the following phenomena: electrochemical dissolution of platinum nanoparticles, particle growth (due to deposition and migration, Ostwald ripening, and coalescence of platinum nanoparticles on the surface of a carbon carrier), diffusion of platinum ions in the ionomer, and their introduction into the membrane. The calculations are performed for two types of platinum catalysts: a commercial monoplatinum system synthesized on carbon black and a catalytic system synthesized on carbon nanotubes. As a result of modeling, data are obtained on the size distribution of the platinum particles and the values of the electrochemically active surface area depending on the time of accelerated stress testing.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 6","pages":"1945 - 1956"},"PeriodicalIF":0.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676422","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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