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Separation of Heterazeotropic Mixtures by Distillation Using Heat Pumps 用热泵蒸馏法分离异共沸混合物
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-07-24 DOI: 10.1134/S0040579526700314
G. A. Nosov, M. E. Uvarov, N. P. Bagautdinov
{"title":"Separation of Heterazeotropic Mixtures by Distillation Using Heat Pumps","authors":"G. A. Nosov,&nbsp;M. E. Uvarov,&nbsp;N. P. Bagautdinov","doi":"10.1134/S0040579526700314","DOIUrl":"10.1134/S0040579526700314","url":null,"abstract":"<div><p>This paper examines the use of open-loop heat pumps in the separation of binary heteroazeotropic mixtures by distillation. Schematic diagrams of installations with various material and heat flow arrangements are provided. The energy costs required for the proposed separation options are estimated. It is shown that the use of heat pumps can significantly improve the energy efficiency of separating the mixtures in question.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 1","pages":"200 - 205"},"PeriodicalIF":0.4,"publicationDate":"2026-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613633","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 Extraction and Separation of Rare Earth Elements from Chloride Technological Solutions in a System with Cyanex 272 cyanex272体系从氯化物工艺溶液中萃取分离稀土元素的研究
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-07-24 DOI: 10.1134/S0040579526700223
M. A. Afonin, A. V. Nechaev, V. V. Belova
{"title":"Study of Extraction and Separation of Rare Earth Elements from Chloride Technological Solutions in a System with Cyanex 272","authors":"M. A. Afonin,&nbsp;A. V. Nechaev,&nbsp;V. V. Belova","doi":"10.1134/S0040579526700223","DOIUrl":"10.1134/S0040579526700223","url":null,"abstract":"<p>Experimental results on extraction of rare earth elements (REEs) from technological chloride solutions in a system with Cyanex 272 are presented as a function of pH and equilibrium REE concentrations in the aqueous phase at different initial extractant concentrations. Extraction of REEs increases with increasing pH in accordance with the cation-exchange mechanism. The distribution coefficients of REEs decrease with increasing equilibrium concentration in the aqueous phase due to a decrease in the free extractant concentration in the organic phase. The extractability of REEs decreases in the order Y &gt; Dy &gt; Tb &gt; Gd, Eu &gt; Sm, which is typical for extraction systems with organophosphorus acids. The experimental results show that in this extraction system yttrium and a combined dysprosium–terbium concentrate can be recovered from a medium-heavy REE concentrate using a single extraction stage.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 1","pages":"125 - 131"},"PeriodicalIF":0.4,"publicationDate":"2026-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613839","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
Specific Features of Substitution of Bivalent and Trivalent Elements for Zirconium in NASICON of Na3Zr2Si2PO12 Composition Na3Zr2Si2PO12组合物中二价和三价元素取代锆的特性
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-07-24 DOI: 10.1134/S004057952670003X
D. N. Grishchenko, M. A. Medkov
{"title":"Specific Features of Substitution of Bivalent and Trivalent Elements for Zirconium in NASICON of Na3Zr2Si2PO12 Composition","authors":"D. N. Grishchenko,&nbsp;M. A. Medkov","doi":"10.1134/S004057952670003X","DOIUrl":"10.1134/S004057952670003X","url":null,"abstract":"<p><b>Abstract</b>—Changes in the phase composition of Na<sub>3</sub>Zr<sub>2</sub>Si<sub>2</sub>PO<sub>12</sub> silicophosphate caused by the partial substitution of Fe<sup>3+</sup> or Mg<sup>2+</sup> for Zr<sup>4+</sup> are studied. The complexes do not correspond to the generally accepted composition Na<sub>3 +</sub> <sub><i>y</i></sub> <sub>+ 2<i>z</i></sub>М(III)<sub><i>у</i></sub>М(II)<sub><i>z</i></sub>Zr<sub>2 –</sub> <sub><i>y</i></sub> <sub>–</sub> <sub><i>z</i></sub>Si<sub>2</sub>PO<sub>12</sub>. In the lattice of doped compositions, (SiO<sub>4</sub>)<sup>4–</sup> is displaced by (PO<sub>4</sub>)<sup>3–</sup> to form free Na<sup>+</sup> and (SiO<sub>4</sub>)<sup>4–</sup> ions in the precursor. The superstoichiometric Na and Si give rise to changes in the structure and morphology of ceramics. These elements are incorporated into the NASICON lattice thus enhancing its parameters irrespective of the dopant radius and valence and taking part in the formation of impurity phases including the glass phase. The results are confirmed by X-ray diffraction analysis, scanning electron microscopy, and Rietveld calculations of unit cell parameters.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 1","pages":"10 - 18"},"PeriodicalIF":0.4,"publicationDate":"2026-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614079","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
Matrices Based on Melted Perlite for the Immobilization of Liquid Radioactive Wastes 基于熔融珍珠岩的放射性液体废物固定化基质研究
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-07-24 DOI: 10.1134/S0040579526700259
S. A. Kulyukhin, V. V. Kulemin, K. V. Martynov, G. V. Kostikova, Yu. M. Nevolin
{"title":"Matrices Based on Melted Perlite for the Immobilization of Liquid Radioactive Wastes","authors":"S. A. Kulyukhin,&nbsp;V. V. Kulemin,&nbsp;K. V. Martynov,&nbsp;G. V. Kostikova,&nbsp;Yu. M. Nevolin","doi":"10.1134/S0040579526700259","DOIUrl":"10.1134/S0040579526700259","url":null,"abstract":"<p>The formation of phases in a matrix obtained by melting perlite saturated with an aqueous salt solution and dried to an air-dry state at temperatures of ~60 and ~130°C was studied. When the perlite saturated with salt solutions was melted, vitreous matrices of uniform composition were formed. The leaching of major elements from the synthesized matrices based on melted perlite containing elements from a salt solution as a simulator of liquid radioactive wastes (LRW) into water at ~25°C for 56 days was studied.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 1","pages":"153 - 162"},"PeriodicalIF":0.4,"publicationDate":"2026-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613581","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
Complex Organomineral Biofertilizer with Prolonged Effect and Increased Static Strength 具有长效和增加静态强度的复合有机生物肥料
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-07-24 DOI: 10.1134/S0040579526700077
V. O. Strel’nikova, Yu. A. Taran, V. M. Fufaeva, A. V. Vyaz’min, N. I. Kalgashkin
{"title":"Complex Organomineral Biofertilizer with Prolonged Effect and Increased Static Strength","authors":"V. O. Strel’nikova,&nbsp;Yu. A. Taran,&nbsp;V. M. Fufaeva,&nbsp;A. V. Vyaz’min,&nbsp;N. I. Kalgashkin","doi":"10.1134/S0040579526700077","DOIUrl":"10.1134/S0040579526700077","url":null,"abstract":"<p>Multilayer granules containing mineral, organic, and microbiological components with a prolonged effect and increased static strength were obtained. The mineral core is a complex NPK fertilizer. The first layer, providing prolonged action, consists of a sulfur-based composition. The second layer is a powdered mixture of microorganisms and phosphogypsum used as a structuring additive to increase the static strength of the granules. The third layer is a hydrophobic coating based on stearic acid that protects microorganisms from premature activation upon exposure to moisture.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 1","pages":"34 - 41"},"PeriodicalIF":0.4,"publicationDate":"2026-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613584","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
Investigation of Factors Controlling the Dissolution of Cobalt Oxide Co3O4 Under Bead Mill Operation Conditions 球磨运行条件下氧化钴Co3O4溶解控制因素的研究
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-07-24 DOI: 10.1134/S0040579526700338
S. D. Pozhidaeva, A. V. Latypova, A. M. Ivanov
{"title":"Investigation of Factors Controlling the Dissolution of Cobalt Oxide Co3O4 Under Bead Mill Operation Conditions","authors":"S. D. Pozhidaeva,&nbsp;A. V. Latypova,&nbsp;A. M. Ivanov","doi":"10.1134/S0040579526700338","DOIUrl":"10.1134/S0040579526700338","url":null,"abstract":"<p><b>Abstract</b>—The experimental data obtained on the effects of catalyst nature, acid concentration and type, and the mass of cobalt oxide on the kinetics of dissolution of cobalt oxide (Co<sub>3</sub>O<sub>4</sub>) in a vertical bead mill using glass beads as an additional inert solid phase, employed to intensify the process via mechanical surface activation, can be taken into account and used to optimize practical processes related to the dissolution of Me<sub>3</sub>O<sub>4</sub> type oxides.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 1","pages":"211 - 216"},"PeriodicalIF":0.4,"publicationDate":"2026-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613634","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
Mobile and Bound Moisture in Epoxy Basalt–Carbon Fiber Composites 环氧玄武岩-碳纤维复合材料的流动和束缚水分
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-07-24 DOI: 10.1134/S0040579526700156
A. A. Gavrilieva, A. K. Kychkin, M. P. Lebedev, A. A. Kychkin, M. M. Kopyrin, A. E. Markov
{"title":"Mobile and Bound Moisture in Epoxy Basalt–Carbon Fiber Composites","authors":"A. A. Gavrilieva,&nbsp;A. K. Kychkin,&nbsp;M. P. Lebedev,&nbsp;A. A. Kychkin,&nbsp;M. M. Kopyrin,&nbsp;A. E. Markov","doi":"10.1134/S0040579526700156","DOIUrl":"10.1134/S0040579526700156","url":null,"abstract":"<p>Moisture interaction with basalt–carbon fiber-reinforced epoxy composites is analyzed. Infrared spectroscopy characterizes interactions between the matrix and the filler during composite formation. The Langmuir model, which partitions absorbed moisture into mobile and bound fractions, adequately describes the kinetics of moisture uptake in these materials, as confirmed by gravimetric analysis and infrared spectroscopy. Mechanisms by which moisture affects mechanical properties are discussed.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 1","pages":"87 - 94"},"PeriodicalIF":0.4,"publicationDate":"2026-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613701","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
Basalt Melting with Inorganic Collectors Containing Simulators of Radioactive Wastes (Cs, Sr, La, Nd, Sm, Gd) as a Way to the Creation of Matrices for the Immobilization of Radioactive Elements 含放射性废物（Cs, Sr, La, Nd, Sm, Gd）模拟物的无机捕集剂熔融玄武岩制备固定放射性元素基质的方法
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-07-24 DOI: 10.1134/S0040579526700235
S. A. Kulyukhin, K. V. Martynov, V. V. Kulemin
{"title":"Basalt Melting with Inorganic Collectors Containing Simulators of Radioactive Wastes (Cs, Sr, La, Nd, Sm, Gd) as a Way to the Creation of Matrices for the Immobilization of Radioactive Elements","authors":"S. A. Kulyukhin,&nbsp;K. V. Martynov,&nbsp;V. V. Kulemin","doi":"10.1134/S0040579526700235","DOIUrl":"10.1134/S0040579526700235","url":null,"abstract":"<p>In this paper, the distribution of Cs, Sr, and Ln (La, Nd, Sm, Gd) in mineral glass and polycrystalline matrices (PCM) synthesized by melting basalt with SiO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub>, and perlite M150 containing Cs, Sr, and Ln (La, Nd, Sm, Gd) compounds at a temperature of 1623 K in air for 5 h was investigated. It was established that the melting of basalt with SiO<sub>2</sub> containing Cs, Sr and Ln (La, Nd, Sm, Gd) results in the formation of mineral glass matrices, the major phases of which are basalt glass containing radioactive elements (RAE), SiO<sub>2</sub> fragments, and Cr–Fe-spinel crystals. SiO<sub>2</sub> fragments contain glass rich in radioactive elements with a composition other than for basalt and Ln-containing crystals. The melting of basalt with Al<sub>2</sub>O<sub>3</sub> containing Cs, Sr, and Ln (La, Nd, Sm, Gd) results in the formation of mineral glass matrices, the major phases of which are aluminosilicate glass containing RAE, finely crystalline anorthite bundles, uniformly distributed coarse anorthite crystals, and fine Fe-spinel crystals. The central area of large anorthite bundles is occupied by a fine-grained aggregate composed of a mixture of phases with an increased RAE content. For perlite M150 containing Cs, Sr, and Ln (La, Nd, Sm, Gd) compounds, melting with basalt gives PCM composed of K–Al–Si- and Na–Si-phases. The potassium aluminosilicate phase is rich in cesium, and the sodium silicate phase is enriched with lanthanides. Strontium is present in both phases, but more in the Na–Si-phase.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 1","pages":"132 - 139"},"PeriodicalIF":0.4,"publicationDate":"2026-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613775","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
Extraction of Rare Earth Elements from Chloride Solutions Using Mixtures of Organophosphorus Acids 有机磷混合物从氯化物溶液中萃取稀土元素
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-07-24 DOI: 10.1134/S0040579526700211
M. A. Afonin, A. V. Nechaev, V. V. Belova
{"title":"Extraction of Rare Earth Elements from Chloride Solutions Using Mixtures of Organophosphorus Acids","authors":"M. A. Afonin,&nbsp;A. V. Nechaev,&nbsp;V. V. Belova","doi":"10.1134/S0040579526700211","DOIUrl":"10.1134/S0040579526700211","url":null,"abstract":"<p>Experimental data on extraction and separation of rare earth elements (REEs) from technological chloride solutions obtained by leaching carbonates of these metals with 10 M HCl are presented using solutions of mixtures of extractants P507 and Cyanex 272 (1 : 1). The mixture of extractants P507 and Cyanex 272 in the initial acidic and sodium forms is shown to be a promising extraction system for separation of yttrium from the total REEs with subsequent separation of terbium and dysprosium fractions from the remaining REEs during processing of solutions obtained by leaching carbonates of rare earth elements.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 1","pages":"119 - 124"},"PeriodicalIF":0.4,"publicationDate":"2026-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613841","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
Effect of Mechanical Activation of Metal Oxide Powder on the Properties of a Thermoplastic Slip 金属氧化物粉末机械活化对热塑性滑块性能的影响
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-07-24 DOI: 10.1134/S0040579526700016
T. S. Volkova, V. O. Tryapitsin, V. V. Rudskikh
{"title":"Effect of Mechanical Activation of Metal Oxide Powder on the Properties of a Thermoplastic Slip","authors":"T. S. Volkova,&nbsp;V. O. Tryapitsin,&nbsp;V. V. Rudskikh","doi":"10.1134/S0040579526700016","DOIUrl":"10.1134/S0040579526700016","url":null,"abstract":"<p>The effect of mechanical treatment of a metal oxide powder on its physicochemical properties, including particle size and shape, specific surface area, bulk density, and specific absorption of the powder particles, was examined. A thermoplastic slip was prepared by two methods, with and without preliminary mechanical activation of the powder. The viscosity of the slip was determined as a function of the preparation method and the mass fraction of the binder.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 1","pages":"1 - 5"},"PeriodicalIF":0.4,"publicationDate":"2026-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613585","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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