Theoretical Foundations of Chemical Engineering最新文献

{"title":"Regularities of Extractive Distillation of the Methanol–Acetonitrile–Tetrahydrofuran–Water Mixture under Various Pressures","authors":"D. A. Ryzhkin,&nbsp;V. M. Raeva,&nbsp;A. K. Frolkova","doi":"10.1134/S0040579524700349","DOIUrl":"10.1134/S0040579524700349","url":null,"abstract":"<div><p>The results of extractive distillation of a four-component mixture of solvents are predicted by means of simulation using the Aspen Plus 10.0 software. Schematic flow diagrams of separation are suggested using various selective agents in distillation columns operating under different pressures.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 1","pages":"202 - 210"},"PeriodicalIF":0.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826246","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}

{"title":"Mn and Cr Extraction from the Secondary Wastes of Metallurgical Combines by Gas-Phase Conversion in Nitriding Media","authors":"S. A. Kulyukhin,&nbsp;Yu. M. Nevolin,&nbsp;A. F. Seliverstov","doi":"10.1134/S0040579524700647","DOIUrl":"10.1134/S0040579524700647","url":null,"abstract":"<div><p>An approach based on the gas-phase processing of secondary wastes in an HNO₃ (vapor)–air or NO_<i>x</i>–H₂O (vapor)–air atmosphere with further Mn and Cr leaching with water is proposed for Mn and Cr extraction from the secondary wastes of metallurgical plants (fly ash from the ore-dressing plant of the Norilsk Combine and rock refuses from the Punda Gourda Nickel Production Combine of the Cuban State-Owned Commercial Caribbean Nickel Company). It is shown that the preliminary treatment of secondary wastes in a nitriding atmosphere at a temperature of 400–425 K for 5 h makes it possible to leach Mn from the volume of secondary wastes. For the fly ash from the ore-dressing plant of the Norilsk Combine and the rock refuses from the Punda Gourda Nickel Production Combine of the Cuban State-Owned Commercial Caribbean Nickel Company, the degree of Mn extraction with water is less than ~33 and ~65% of their total content in the wastes, respectively. The degree of Cr extraction is less ~2% in all cases.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 2","pages":"391 - 396"},"PeriodicalIF":0.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826051","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}

{"title":"Effect of Supercritical Carbon Dioxide Compression Heating in Both Stationary and Flow Regimes","authors":"O. I. Pokrovskiy,&nbsp;I. N. Rostovschikova,&nbsp;K. B. Ustinovich","doi":"10.1134/S0040579524700507","DOIUrl":"10.1134/S0040579524700507","url":null,"abstract":"<p>An effect of supercritical carbon dioxide compressive self-heating was observed both in stationary and flow regimes. The effect is probably caused by fluid compression in near-adiabatic conditions during system filling and pumping. This phenomenon should be taken into account in process design and optimization for systems employing sub- and supercritical fluids, such as supercritical fluid extraction, chromatography, aerogel drying <i>etc.</i></p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 2","pages":"450 - 455"},"PeriodicalIF":0.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826099","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}

{"title":"Carbon Molecular Sieves for the Sorption Recovery of Gold from Cyanide Solutions","authors":"A. A. Fomkin,&nbsp;A. L. Pulin,&nbsp;A. V. Shkolin,&nbsp;I. E. Men’shchikov","doi":"10.1134/S0040579524700441","DOIUrl":"10.1134/S0040579524700441","url":null,"abstract":"<div><p>The structural and energy characteristics of some commercial and laboratory microporous carbon adsorbents applied in the cyanide gold recovery technology are studied. The average effective widths of the micropores in these adsorbents are close to 1.1 nm. The successive application of such adsorbents is explained by molecular sieve effects with respect to the cyanide gold complex.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 2","pages":"277 - 280"},"PeriodicalIF":0.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826302","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}

{"title":"The Effect of the Conditions of Extractive–Pyrolytic Synthesis on the Luminescence Characteristics of Inorganic Luminophores Based on Mixed Oxides of Rare-Earth and Rare Elements","authors":"N. I. Steblevskaya,&nbsp;M. V. Belobeletskaya","doi":"10.1134/S0040579524700283","DOIUrl":"10.1134/S0040579524700283","url":null,"abstract":"<p>The general conditions of the synthesis of luminophores based on mixed oxides of rare-earth and rare elements by a low-temperature extractive–pyrolytic method are discussed. The dependence of the relative integral intensity of luminescence on the pyrolysis temperature of the precursors is studied on the example of samples of luminophores based on oxides of europium Eu₂O₃ and terbium Tb₄O₇; europium, terbium, yttrium, and praseodymium oxysulfides; europium phosphates Eu₃PO₇ and Eu(PO₃)₃ and phosphate Eu(PO₃)₃:Eu²⁺ doped with a Eu²⁺ ion; terbium phosphates TbPO₄ and Tb(PO₃)₃; mixed phosphates La_0.8Ce_0.15Tb_0.05PO₄ and La_0.8Ce_0.15Tb_0.05(PO₃)₃; europium polyniobates EuNb₃O₉ and EuNb₅O₁₄; europium polytantalates EuTa₃O₉, EuTa₅O₁₄, and EuTa₇O₁₉; terbium polytantalates TbTa₃O₉, TbTa₅O₁₄, and TbTa₇O₁₉; and europium ortho- and metaborates La_0.95Eu_0.05BO₃ and La_0.95Eu_0.05(BO₂)₃ including La_0.03Eu_0.05Bi_0.05BO₃ and La_0.90Eu_0.05Bi_0.05(BO₂)₃ doped with bismuth ions. It is found that, according to the data of X-ray diffraction, individual compounds are formed at temperatures as low as 600°C. Increasing the pyrolysis temperature of the precursors to the optimum temperature leads to a gradual growth in the relative integral intensity of the bands in the luminescence spectra. The luminescence spectra of the samples of luminophores based on compounds of europium or terbium consist of a series of bands corresponding to the ⁵D₀–⁷F_<i>j</i>  transitions between the multiplets (<i>j</i> = 0, 1, 2, 3, 4) characteristic of the Eu₃₊ ion (in the region of 550–750 nm) or ⁵D₄–⁷F_<i>j</i> transitions (<i>j</i> = 1–6) characteristic of the Tb³⁺ ion (in the region of 500–650 nm), respectively.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 1","pages":"159 - 168"},"PeriodicalIF":0.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826275","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}

{"title":"Extraction of Lanthanides from Nitrate Solutions in Multicomponent Systems in the Presence of Cyanex 572","authors":"V. V. Belova,&nbsp;Yu. V. Tsareva,&nbsp;A. E. Kostanyan","doi":"10.1134/S0040579524700325","DOIUrl":"10.1134/S0040579524700325","url":null,"abstract":"<div><p>The paper studied the extraction of lanthanides from nitrate solutions (0.01 M HNO₃ + 0.1 M NaNO₃) in hexane–isopropanol–water three-component systems using Cyanex 572 as an extractant. The experiments showed the promise of using the extractant Cyanex 572 for the separation of lanthanides from nitrate media in three-component systems.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 1","pages":"188 - 191"},"PeriodicalIF":0.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826244","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}

{"title":"Composite Material Based on Mineral Fibers and Gabbro from the Navolokskoye Deposit","authors":"E. I. Berbekova,&nbsp;M. A. Kaplan,&nbsp;A. G. Kolmakov,&nbsp;V. A. Krenev,&nbsp;D. F. Kondakov,&nbsp;E. N. Pechenkina,&nbsp;S. V. Fomichev","doi":"10.1134/S0040579524700465","DOIUrl":"10.1134/S0040579524700465","url":null,"abstract":"<div><p>Laboratory samples of a new functional material are obtained by mixing two fractions of crushed gabbro rock with different particle sizes in the ratio coarse : fine = 1 : 10 and discrete basalt fibers in an amount of 8 wt % of the initial mass of the mixture. Potassium liquid glass is used as a binder. The resulting mass is placed in a mold, followed by pressing and molding of blanks. After drying, they are sintered. The sintered samples have the shape of a cylinder with dimensions <i>h</i> × <i>d</i> = 10 × 10 mm. For all samples, the following are determined: pycnometric density, Brinell hardness, tensile strength, and residual deformation.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 2","pages":"284 - 286"},"PeriodicalIF":0.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826471","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}

{"title":"Comparative Analysis of the Effect of HDPE and UHMWPE on the Properties of Nitrile Butadiene Rubber","authors":"N. V. Shadrinov,&nbsp;A. F. Fedorova,&nbsp;V. D. Gogolev","doi":"10.1134/S004057952470057X","DOIUrl":"10.1134/S004057952470057X","url":null,"abstract":"<div><p>A comparative analysis was made of the effect of high-density polyethylene (HDPE) and ultra-high-molecular-weight polyethylene (UHMWPE) on the vulcanization characteristics of rubber mixtures and the physicomechanical properties of vulcanizates based on BNKS-18AMN nitrile butadiene rubber. It was shown that the introduction of 10 pts wt HDPE has a reinforcing effect, but reduces the degree of crosslinking of vulcanizates and abrasion resistance. In comparison with HDPE, the introduction of 10 pts wt UHMWPE does not have a reinforcing effect, but on the contrary leads to a decrease in physicomechanical properties in tension, but at the same time increases the wear resistance and frost resistance of the samples.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 2","pages":"346 - 352"},"PeriodicalIF":0.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826324","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}

{"title":"On the Effect of Sensitizing Ions on the Spectral Luminescent Characteristics of the Eu3+ Activating Ion in Lanthanum Ortho- and Metaborates","authors":"M. V. Belobeletskaya,&nbsp;N. I. Steblevskaya","doi":"10.1134/S0040579524700301","DOIUrl":"10.1134/S0040579524700301","url":null,"abstract":"<div><p>The effect of Tb³⁺ and Bi³⁺ sensitizing ions on the spectral luminescent characteristics of the Eu³⁺ activating ion in lanthanum ortho- and metaborates is studied. The compounds are studied by X-ray diffraction and luminescent spectroscopy. The doping of La_{1 –} _<i>x</i>Eu_<i>х</i>BO₃ and La_{1 –} _<i>x</i>Eu_<i>х</i>(BO₂)₃ (<i>х</i> = 0.025; 0.05; 0.075; 0.10) with ions Tb³⁺ and Tb³⁺ in combination with Bi₃ is found to enlarge the range of luminescence in the visible region. Moreover, due to energy transfer from Bi³⁺ to Eu³⁺ in lanthanum orthoborates, the integral luminescence intensity (λ_ex ~ 615 nm) grows by ~25% as compared to the samples free from Bi³⁺ (optimal Bi³⁺ concentration is 5 mol %).</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 1","pages":"176 - 181"},"PeriodicalIF":0.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826242","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}

{"title":"Perlite Processing Method","authors":"I. M. Makaryan,&nbsp;N. B. Knyazyan,&nbsp;E. M. Nazaryan,&nbsp;A. G. Arustamyan,&nbsp;E. S. Agamyan,&nbsp;A. A. Akopyan","doi":"10.1134/S0040579524700246","DOIUrl":"10.1134/S0040579524700246","url":null,"abstract":"<div><p>A method for processing perlite with a 20% caustic soda solution at a temperature of 108°C was developed. The work was aimed at studying the processing of perlite at low temperatures, without autoclaving, without sintering, and with the extraction of a significant amount of useful components: aluminum oxide and silicon oxide with the production of sodium metasilicate nanohydrate, aluminosilicates of various metals, and crystalline SiO₂.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 1","pages":"132 - 136"},"PeriodicalIF":0.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826272","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}