Theoretical Foundations of Chemical Engineering最新文献_第3页

Thermodynamic Analysis of Liquid–Vapor Phase Equilibrium in Binary Systems with One Associating Component 单组分二元体系液-气相平衡的热力学分析

IF 0.7 4区工程技术

Theoretical Foundations of Chemical Engineering Pub Date : 2025-03-23 DOI: 10.1134/S0040579525600895

V. A. Lotkhov, S. Ya. Kvashnin, A. V. Polkovnichenko, N. N. Kulov

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Experimental Study of Hydrodynamics and Mass Transfer in Microchannels for Designing Microreactors and Microextractors 微反应器和微萃取器设计中流体力学和传质实验研究

IF 0.7 4区工程技术

Theoretical Foundations of Chemical Engineering Pub Date : 2025-03-23 DOI: 10.1134/S0040579525600615

A. A. Yagodnitsyna, A. V. Kovalev, A. V. Bilsky

{"title":"Experimental Study of Hydrodynamics and Mass Transfer in Microchannels for Designing Microreactors and Microextractors","authors":"A. A. Yagodnitsyna, A. V. Kovalev, A. V. Bilsky","doi":"10.1134/S0040579525600615","DOIUrl":"10.1134/S0040579525600615","url":null,"abstract":"The development of continious single-phase and two-phase microreactors and microextractors requires information on the hydrodynamics of the flows in such devices: velocity and vorticity distributions, mixing efficiency, and two-phase flow regimes, and their influence on the mass-transfer rate. The paper presents studies of the local hydrodynamic characteristics of flow and mass-transfer processes in T-type microchannels using optical techniques. For a single-phase microreactor, the velocity fields and concentration fields are measured. The intensification of mixing during the transition to the engulfment flow regime is shown. For two-phase microreactors with different sets of immiscible liquids, flow regimes are visualized, and a dimensionless complex for generalizing the experimental data is proposed. It is shown that neural-network algorithms trained on a large sample allow predicting flow regimes with high accuracy (up to 98%). The slug flow regime with superposition of external pressure pulsations of the dispersed phase is investigated. It is shown that the velocity field inside the plugs changes periodically, which can be used to intensify mass transfer. Using the micron-resolution laser-induced fluorescence (micro-LIF) technique, local mass transfer in a two-phase microextractor is studied.","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 5","pages":"1504 - 1517"},"PeriodicalIF":0.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676459","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}

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Application of Magnetic Liquids as Cooling Agents in Condensers of Rectification Columns on the Example of Hydrogen Peroxide Production 磁性液体作为冷却剂在精馏塔冷凝器中的应用——以过氧化氢生产为例

IF 0.7 4区工程技术

Theoretical Foundations of Chemical Engineering Pub Date : 2025-03-23 DOI: 10.1134/S0040579525601050

V. M. Khairutdinova, V. A. Naletov, L. V. Ravichev, A. Yu. Naletov, M. B. Glebov

{"title":"Application of Magnetic Liquids as Cooling Agents in Condensers of Rectification Columns on the Example of Hydrogen Peroxide Production","authors":"V. M. Khairutdinova, V. A. Naletov, L. V. Ravichev, A. Yu. Naletov, M. B. Glebov","doi":"10.1134/S0040579525601050","DOIUrl":"10.1134/S0040579525601050","url":null,"abstract":"The possibility of using magnetic fluids as a cooling agent in condensers of distillation columns is considered. It is known that the energy costs for condensing vapors and cooling the product in condensers of distillation columns can constitute a significant part of the total costs. Therefore, a number of studies are devoted to the problem of their reduction. These include the use of thermal integration, new designs of heat-transfer equipment, and the development of more efficient cooling agents. The latter include specially developed magnetic fluids. Due to a number of unique thermal–physical properties, they find a wide variety of technological applications, including the intensification of heat transfer in rectification columns. The aim of this work was to evaluate the reduction of energy costs for condensation of vapors in the condenser of a distillation column by replacing traditional cooling agents (water, brines, etc.) with magnetic fluid solutions. This assessment is carried out using the example of columns for the extraction of acetone and isopropyl alcohol in the production of hydrogen peroxide. The following magnetic fluids are considered: an aqueous solution of aluminum oxide nanoparticles, an aqueous solution of copper oxide nanoparticles, and an aqueous solution of single-walled carbon nanotubes (SWCNT). The volume content of the metal oxide particles varies from 0 to 6%. The dependences of the growth of the heat-transfer coefficient on the volume content of the metal oxide nanoparticles and SWCNT particles are obtained. Comparison of the efficiency of using the three selected nanofluids shows that the greatest increase in the heat-transfer coefficient occurs when using SWCNT.","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 6","pages":"2003 - 2008"},"PeriodicalIF":0.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676462","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}

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A New Approach to Formulating Low-Viscosity Marine Fuels 配制低粘度船用燃料的新途径

IF 0.7 4区工程技术

Theoretical Foundations of Chemical Engineering Pub Date : 2025-03-23 DOI: 10.1134/S0040579525600792

S. G. Dyachkova, Zh. N. Artemeva

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Optimal Organization of Chemical-Technological Systems with Multiple Levels of Aggregation 多级聚合化工工艺系统的最优组织

IF 0.7 4区工程技术

Theoretical Foundations of Chemical Engineering Pub Date : 2025-03-23 DOI: 10.1134/S0040579525600962

V. A. Naletov, M. B. Glebov, L. V. Ravichev, A. Yu. Naletov

{"title":"Optimal Organization of Chemical-Technological Systems with Multiple Levels of Aggregation","authors":"V. A. Naletov, M. B. Glebov, L. V. Ravichev, A. Yu. Naletov","doi":"10.1134/S0040579525600962","DOIUrl":"10.1134/S0040579525600962","url":null,"abstract":"This paper presents an algorithm for improving the organization of chemical-technological systems (CTSs) with several levels of aggregation based on information approach. The algorithm assumes the sequential solution of optimization problems according to the top-down principle, starting from the upper to the lower macroscopic levels, and then to the optimization problem at the microlevel. When solving optimization problems at all macrolevels, the optimization criterion is macroentropy, whose maximization in accordance with the zeroth law of thermodynamics is responsible for the optimal distribution of energy between elements and subsystems. The implementation of the algorithm is illustrated using the example of a system with a double-chamber heating furnace consisting of convection and radiation chambers combined into a single thermal unit. The determination of the tendencies of optimal organization of the CTS with the furnace as a single thermal unit and the furnace as a subsystem with a discrete element structure was made on the basis of the equivalent temperature distribution diagram determining the weight coefficients of the processes comprising the macroentropy criterion.","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 6","pages":"1908 - 1915"},"PeriodicalIF":0.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676505","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

Thermal Disposal of Waste Oils 废油的热处理

IF 0.7 4区工程技术

Theoretical Foundations of Chemical Engineering Pub Date : 2025-03-23 DOI: 10.1134/S0040579525600494

V. V. Semenov, V. I. Zhdanov, I. A. Sinyukov, M. V. Grafkina

{"title":"Thermal Disposal of Waste Oils","authors":"V. V. Semenov, V. I. Zhdanov, I. A. Sinyukov, M. V. Grafkina","doi":"10.1134/S0040579525600494","DOIUrl":"10.1134/S0040579525600494","url":null,"abstract":"Pollution of the environment by petroleum products is a serious ecological problem. Several methods exist for the disposal of waste oils, including regeneration, burial, and incineration. The incineration of waste oils is widely practiced both in Russia and abroad. However, a significant drawback of this method is the release of harmful substances into the atmosphere. This study presents the results of research aimed at developing a more advanced thermal disposal system for waste oils that ensures complete combustion and reduces harmful emissions. The thermal disposal system consists of a furnace and an emulsion nozzle. The furnace, which includes a combustion chamber and a post-combustion chamber, enables two-zone, two-stage oil combustion. In the combustion chamber, the initial burning of the oil occurs (first combustion zone at t ≈ 600–700°C). The resulting flue gas then enters the post-combustion chamber, where complete combustion is achieved by supplying additional air (second combustion zone at t ≈ 1200–1300°C). At these elevated temperatures, toxic substances in the flue gas undergo full oxidation, converting them into harmless compounds. The emulsion nozzle consists of intersecting grooves that, when supplied with air and heated oil, generate fine oil atomization by forming gas-liquid vortices in the intersecting channels. Using ANSYS software, the spray angle of the emulsion nozzle was calculated. It was found that to adjust the spray range and enable the use of emulsion nozzles in furnaces of different volumes and capacities, the screw angle must be modified. This research contributes to the advancement of waste processing technologies. The proposed solution allows the system to be used in industrial centers, where significant volumes of waste oil accumulate, and in sparsely populated areas. Additionally, it ensures the complete combustion of oil waste and minimizes its negative environmental impact.","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 5","pages":"1784 - 1789"},"PeriodicalIF":0.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676371","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 Distributions of Specific Energy Dissipation Rate on Mass-Transfer Efficiency in Apparatus with Liquid-Phase Media 比能量耗散率分布对液相介质装置传质效率的影响

IF 0.7 4区工程技术

Theoretical Foundations of Chemical Engineering Pub Date : 2025-03-23 DOI: 10.1134/S0040579525601098

R. Sh. Abiev

{"title":"Influence of Distributions of Specific Energy Dissipation Rate on Mass-Transfer Efficiency in Apparatus with Liquid-Phase Media","authors":"R. Sh. Abiev","doi":"10.1134/S0040579525601098","DOIUrl":"10.1134/S0040579525601098","url":null,"abstract":"A theoretical analysis of the influence of the distribution of the local specific energy dissipation rate on the specific surface area of phase contact and the superficial and volumetric mass-transfer coefficients in devices with heterophase processes and a liquid continuous phase, as well as on the quality of mixing in devices with homophase reactions in the liquid phase, is performed. It is shown that the average value of the specific energy dissipation rate for the volume of the apparatus is not a complete criterion for assessing the useful effect, since it does not take into account, on the one hand, the local level of energy dissipation in the active zones, and on the other hand, the features of the flow structure and the local residence time in the active zones, depending on the geometry of the apparatus and the method of introducing energy into it. Limiting cases are discussed: a non-uniform distribution of energy in the presence of a zone of small volume with a high dissipation rate and an ideally uniform distribution of energy throughout the entire volume of the apparatus. In the first case, a significant portion of the volume is used inefficiently; in the second case, an excessive amount of energy is expended. In this regard, the concepts of dosed distributed energy input for long-term processes and maximum concentration of energy in a microvolume for fast-flowing processes are considered.","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 6","pages":"2034 - 2052"},"PeriodicalIF":0.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676373","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

Approaches to Description of the Composition and Properties of Vacuum Gas Oil for Constructing Mathematical Models of Deep Oil-Refining Processes 建立深层炼油过程数学模型中描述真空瓦斯油的组成和性质的方法

IF 0.7 4区工程技术

Theoretical Foundations of Chemical Engineering Pub Date : 2025-03-23 DOI: 10.1134/S0040579525600639

E. N. Ivashkina, G. Yu. Nazarova, A. Yu. Dement’ev, V. A. Chuzlov, D. Yu. Sladkov, E. R. Samoylov, M. S. Grigorash

{"title":"Approaches to Description of the Composition and Properties of Vacuum Gas Oil for Constructing Mathematical Models of Deep Oil-Refining Processes","authors":"E. N. Ivashkina, G. Yu. Nazarova, A. Yu. Dement’ev, V. A. Chuzlov, D. Yu. Sladkov, E. R. Samoylov, M. S. Grigorash","doi":"10.1134/S0040579525600639","DOIUrl":"10.1134/S0040579525600639","url":null,"abstract":"This paper presents the results of determining the composition of vacuum gas oil, a raw material for deep oil-refining processes, using two-dimensional gas chromatography. These results are the basis for describing the formalized mechanism of hydrocarbon transformations of high-boiling oil fractions in the processes of hydrocracking and catalytic cracking. The found hydrocarbon composition is used in modeling the composition of vacuum gas oil using the structure-oriented lumping method. The increment vectors of hydrocarbons contained in vacuum gas oil are compiled. The normal boiling point of the fraction is calculated for these vectors. Using the developed algorithm, the component composition of the raw material of the second stage of hydrocracking is reconstructed, according to which its fractional composition is calculated; the calculation error does not exceed 4°C. Based on laboratory and numerical studies, the reaction schemes of the processes of hydrocracking and catalytic cracking of vacuum gas oil are compiled. The studies performed using a mathematical model of cracking show that the involvement in the processing of mixed raw materials containing 15% distillate slack and 15% extract of selective oil purification allows increasing the productivity of the catalytic cracking unit and provides a favorable fuel mode for its operation.","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 5","pages":"1532 - 1544"},"PeriodicalIF":0.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676225","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

Experimental Study and Modeling of Dispersion in Spray Drying for Producing Powdered Pharmaceutical Compositions 粉末状药物组合物喷雾干燥中分散的实验研究与建模

IF 0.7 4区工程技术

Theoretical Foundations of Chemical Engineering Pub Date : 2025-03-23 DOI: 10.1134/S0040579525601025

E. A. Lebedev, N. V. Menshutina

引用次数: 0

Extraction of Rare-Earth Elements with Deep Eutectic Solvent Di(2,4,4-trimethylpentyl)phosphinic Acid/Phenol 深共熔溶剂二（2,4,4-三甲基戊基）膦酸/苯酚萃取稀土元素

IF 0.7 4区工程技术

Theoretical Foundations of Chemical Engineering Pub Date : 2025-03-23 DOI: 10.1134/S0040579525601062

I. V. Zinov’eva, T. Yu. Chikineva, S. A. Yakovleva, Yu. A. Zakhodyaeva, A. A. Voshkin

{"title":"Extraction of Rare-Earth Elements with Deep Eutectic Solvent Di(2,4,4-trimethylpentyl)phosphinic Acid/Phenol","authors":"I. V. Zinov’eva, T. Yu. Chikineva, S. A. Yakovleva, Yu. A. Zakhodyaeva, A. A. Voshkin","doi":"10.1134/S0040579525601062","DOIUrl":"10.1134/S0040579525601062","url":null,"abstract":"A hydrophobic deep eutectic solvent based on di(2,4,4-trimethylpentyl)phosphinic acid and phenol is proposed as an extractant for the separation of a number of rare-earth element ions from nitrate solutions. Experimental data on the interphase distribution of Pr, Nd, Tb, Dy, and Yb ions in the di(2,4,4-trimethylpentyl)phosphinic acid/phenol system are obtained with varying key process conditions: medium acidity, salting-out agent concentration, component ratio in the eutectic solvent, metal concentration, etc. The study establishes the mechanism of rare-earth-metal cation extraction by the proposed eutectic solvent and the composition of the extracted compounds using the tilt angle method. A study of metal ion re-extraction from the organic phase with mineral acid solutions is conducted, and the possibility of repeated use of the proposed eutectic solvent in chemical engineering processes is assessed. The obtained results indicate the potential of using the deep eutectic solvent di(2,4,4-trimethylpentyl)phosphinic acid/phenol for the extraction of rare-earth-metal cations in magnetic waste recycling processes.","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 6","pages":"2009 - 2016"},"PeriodicalIF":0.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676428","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