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The best performance of inclined flat-plate thermal-diffusion columns 斜平板热扩散柱性能最佳
Separations Technology Pub Date : 1995-05-01 DOI: 10.1016/0956-9618(95)00113-K
Ho-Ming Yeh
{"title":"The best performance of inclined flat-plate thermal-diffusion columns","authors":"Ho-Ming Yeh","doi":"10.1016/0956-9618(95)00113-K","DOIUrl":"10.1016/0956-9618(95)00113-K","url":null,"abstract":"<div><p>The optimum angles of inclination for maximum separation, maximum production rate and minimum column length in a flat-plate thermal-diffusion column have been determined. Considerable improvement in performance is obtainable if the column is tilted at the optimum angle, instead of being placed vertically, so that the convection strength can be properly reduced and controlled, resulting in suppressing the undesirable remixing effect while still preserving the desirable cascading effect.</p></div>","PeriodicalId":101160,"journal":{"name":"Separations Technology","volume":"5 2","pages":"Pages 115-120"},"PeriodicalIF":0.0,"publicationDate":"1995-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-9618(95)00113-K","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89417453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Effect of water vapor on adsorption of methyl iodide to triethylenediamine-impregnated activated carbons 水蒸气对三乙二胺浸渍活性炭吸附碘化甲基的影响
Separations Technology Pub Date : 1995-02-01 DOI: 10.1016/0956-9618(94)00104-Z
Seong Won Park , Hyun Soo Park , Won Kook Lee , Hee Moon
{"title":"Effect of water vapor on adsorption of methyl iodide to triethylenediamine-impregnated activated carbons","authors":"Seong Won Park ,&nbsp;Hyun Soo Park ,&nbsp;Won Kook Lee ,&nbsp;Hee Moon","doi":"10.1016/0956-9618(94)00104-Z","DOIUrl":"10.1016/0956-9618(94)00104-Z","url":null,"abstract":"<div><p>The effect of humidity on the adsorption and desorption of methyl iodide was investigated in a TEDA (triethylenediamine)-impregnated activated carbon bed. The amounts of chemisorption and physical adsorption of methyl iodide were measured in different humidity levels for base and TEDA-impregnated activated carbons. The physical adsorption of methyl iodide in the presence of water vapor was fitted with the potential theory-based Dubinin-Radushkevich equation. The significant amount of chemisorption even in high humidity conditions confirmed the effectiveness of TEDA-impregnation for trapping methyl iodide permanently.</p></div>","PeriodicalId":101160,"journal":{"name":"Separations Technology","volume":"5 1","pages":"Pages 35-44"},"PeriodicalIF":0.0,"publicationDate":"1995-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-9618(94)00104-Z","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83575891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 29
Erratum to “A study of separation by the direct-contact membrane distillation process” Sep. Technol. 4 (1994) 244 《直接接触膜蒸馏法分离的研究》，《技术》1994年第4期
Separations Technology Pub Date : 1995-02-01 DOI: 10.1016/0956-9618(94)00107-4
M. Tomaszewska, M. Gryta, A.W. Morawski
{"title":"Erratum to “A study of separation by the direct-contact membrane distillation process” Sep. Technol. 4 (1994) 244","authors":"M. Tomaszewska,&nbsp;M. Gryta,&nbsp;A.W. Morawski","doi":"10.1016/0956-9618(94)00107-4","DOIUrl":"10.1016/0956-9618(94)00107-4","url":null,"abstract":"","PeriodicalId":101160,"journal":{"name":"Separations Technology","volume":"5 1","pages":"Page 57"},"PeriodicalIF":0.0,"publicationDate":"1995-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-9618(94)00107-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82691847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Binary adsorption and desorption rates of propylene-propane mixtures on 13 X molecular sieves 丙烯-丙烷混合物在13x分子筛上的二元吸附和解吸速率
Separations Technology Pub Date : 1995-02-01 DOI: 10.1016/0956-9618(94)00102-X
Y.-H. Huang, A.I. Liapis, Y. Xu, O.K. Crosser, J.W. Johnson
{"title":"Binary adsorption and desorption rates of propylene-propane mixtures on 13 X molecular sieves","authors":"Y.-H. Huang,&nbsp;A.I. Liapis,&nbsp;Y. Xu,&nbsp;O.K. Crosser,&nbsp;J.W. Johnson","doi":"10.1016/0956-9618(94)00102-X","DOIUrl":"10.1016/0956-9618(94)00102-X","url":null,"abstract":"<div><p>The experimental adsorption and desorption rate data for pure propylene, pure propane, and propylene-propane mixtures on 13 X molecular sieves are presented for different temperatures and compositions; these rate data were efficiently determined using the differential sorption bed system described by Liapis et al. (Liapis et al. (1992) Rates and equilibria of adsorption and desorption of propane and propylene on 13 X molecular sieves determined experimentally using a differential sorption bed system. Sep. Technol. 2, 141–154). Propylene is the most preferentially adsorbed component, and the desorption rates of propylene and propane are slower than the adsorption rates. Mathematical models were constructed and solved, and it was found that the two-component model could provide a quantitative measure of the interactions between propylene and propane, and could describe the behavior of binary adsorption kinetics including the overshoot of the equilibrium loading by the less preferentially adsorbed propane. The theoretical results indicate that the desorption rates are not described by the same intracrystalline diffusion coefficients as the adsorption rates.</p></div>","PeriodicalId":101160,"journal":{"name":"Separations Technology","volume":"5 1","pages":"Pages 1-11"},"PeriodicalIF":0.0,"publicationDate":"1995-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-9618(94)00102-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77252771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Electrokinetic transport phenomena 电动输运现象
Separations Technology Pub Date : 1995-02-01 DOI: 10.1016/0956-9618(95)90014-4
Bandaru Ramarao
{"title":"Electrokinetic transport phenomena","authors":"Bandaru Ramarao","doi":"10.1016/0956-9618(95)90014-4","DOIUrl":"10.1016/0956-9618(95)90014-4","url":null,"abstract":"","PeriodicalId":101160,"journal":{"name":"Separations Technology","volume":"5 1","pages":"Pages 55-56"},"PeriodicalIF":0.0,"publicationDate":"1995-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-9618(95)90014-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"108539532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Adsorption of 1-butanol and p-xylene vapor and their mixtures with high silica zeolites 高硅沸石对1-丁醇和对二甲苯蒸气及其混合物的吸附
Separations Technology Pub Date : 1995-02-01 DOI: 10.1016/0956-9618(94)00101-W
Yasushi Takeuchi , Hayato lwamoto , Norio Miyata , Seiichi Asano , Masashi Harada
{"title":"Adsorption of 1-butanol and p-xylene vapor and their mixtures with high silica zeolites","authors":"Yasushi Takeuchi ,&nbsp;Hayato lwamoto ,&nbsp;Norio Miyata ,&nbsp;Seiichi Asano ,&nbsp;Masashi Harada","doi":"10.1016/0956-9618(94)00101-W","DOIUrl":"10.1016/0956-9618(94)00101-W","url":null,"abstract":"<div><p>Experiments on fixed-bed adsorption of 1-butanol vapor, <em>p</em>-xylene vapor and their mixtures with high silica zeolites (HSZ) were conducted. For the cases of single-component adsorption, the adsorption equilibria obey the Langmuir equation, and the presence of water vapor was found to reduce the amount of adsorption. On the other hand, water vapor showed no effect on adsorption kinetics. For binary adsorption of 1-butanol and <em>p</em>-xylene with HSZ of Y- and Mordenite-type, depending upon the relative concentration of the two species, either species may be preferentially adsorbed. No simple expression was found to represent the equilibrium data. In contrast, the Langmuir equation was found to represent the binary equilibrium data of HSZ of the ZSM-5 type. Further, the dynamics of the fixed-bed adsorption may be predicted with use of the extended mass-transfer-zone method.</p></div>","PeriodicalId":101160,"journal":{"name":"Separations Technology","volume":"5 1","pages":"Pages 23-34"},"PeriodicalIF":0.0,"publicationDate":"1995-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-9618(94)00101-W","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79321342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 44
Removal of formaldehyde from aqueous solutions 从水溶液中去除甲醛
Separations Technology Pub Date : 1995-02-01 DOI: 10.1016/0956-9618(94)00100-7
Aspi K. Kolah, Man Mohan Sharma
{"title":"Removal of formaldehyde from aqueous solutions","authors":"Aspi K. Kolah,&nbsp;Man Mohan Sharma","doi":"10.1016/0956-9618(94)00100-7","DOIUrl":"10.1016/0956-9618(94)00100-7","url":null,"abstract":"<div><p>The removal of formaldehyde from aqueous solutions of 2-butyne-1,4-diol (BD), which are prepared from ethynylation of acetylene with aqueous formaldehyde, was successfully accomplished by a number of approaches: reaction with sodium bisulfite and removal of the resultant ionic product with an anion exchange resin in a fixed bed system or using an anion exchange resin bed in bisulfite form; reactive distillation with methanol and ethylene glycol in the presence of cation exchange resin as catalyst to give the corresponding acetals; internal acetalization with BD in the presence of cation exchange resin as catalyst; Cannizzaro's reaction with sodium hydroxide; and aldol type condensation in the presence of sodium hydroxide. Residual concentrations of formaldehyde as low as 20 ppm could be achieved through more than one of the methods mentioned above.</p></div>","PeriodicalId":101160,"journal":{"name":"Separations Technology","volume":"5 1","pages":"Pages 13-22"},"PeriodicalIF":0.0,"publicationDate":"1995-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-9618(94)00100-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86175213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
Constant pressure filtration of submicron particles 亚微米颗粒的恒压过滤
Separations Technology Pub Date : 1995-02-01 DOI: 10.1016/0956-9618(94)00106-3
Wei-Ming Lu , Chih-Cheng Lai , Kuo-Jen Hwang
{"title":"Constant pressure filtration of submicron particles","authors":"Wei-Ming Lu ,&nbsp;Chih-Cheng Lai ,&nbsp;Kuo-Jen Hwang","doi":"10.1016/0956-9618(94)00106-3","DOIUrl":"10.1016/0956-9618(94)00106-3","url":null,"abstract":"<div><p>The mechanism of cake formation in constant pressure filtrations of submicron particles is studied by analysing the forces exerted on the depositing particles. The Brownian dynamic method is used to trace the loci of slurry particles and to simulate the packing structure of submicron particles in filtrations. The major factors affecting the particle packing, such as frictional drag, van der Waals' force, electrostatic force, and Brownian force, etc., are discussed. The most compact cake is found when the frictional drag and Brownian force are of the same order of magnitude. A numerical program is designed to estimate the variations of local cake properties during a course of constant pressure filtration. The calculated results of average cake porosity and average specific filtration resistance agree very well with the experimental data.</p></div>","PeriodicalId":101160,"journal":{"name":"Separations Technology","volume":"5 1","pages":"Pages 45-53"},"PeriodicalIF":0.0,"publicationDate":"1995-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-9618(94)00106-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86005748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 20
Recovery of butyric acid, valeric acid, and caproic acid (BVC acids) from an aqueous waste stream using tributylphosphate (TBP) as an extractant 用磷酸三丁酯(TBP)作为萃取剂从废水中回收丁酸、戊酸和己酸(BVC酸)
Separations Technology Pub Date : 1994-10-01 DOI: 10.1016/0956-9618(94)80030-8
M.N. Ingale, V.V. Mahajani
{"title":"Recovery of butyric acid, valeric acid, and caproic acid (BVC acids) from an aqueous waste stream using tributylphosphate (TBP) as an extractant","authors":"M.N. Ingale,&nbsp;V.V. Mahajani","doi":"10.1016/0956-9618(94)80030-8","DOIUrl":"10.1016/0956-9618(94)80030-8","url":null,"abstract":"<div><p>The distribution coefficients, K<sub>D</sub>, were measured for the extraction of butyric acid, valeric acid, and caproic acid with tributylphosphate from an aqueous waste stream. The measurements were also carried out in the presence of salts such as sodium sulphate and sodium chloride. The results presented are expected to aid process environmental engineers.</p></div>","PeriodicalId":101160,"journal":{"name":"Separations Technology","volume":"4 4","pages":"Pages 252-257"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-9618(94)80030-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83538006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
Conceptual design for a process to recover volatile solutes from aqueous solutions using silicalite 利用硅石从水溶液中回收挥发性溶质工艺的概念设计
Separations Technology Pub Date : 1994-10-01 DOI: 10.1016/0956-9618(94)80025-1
Mark T. Holtzapple, Russell F. Brown
{"title":"Conceptual design for a process to recover volatile solutes from aqueous solutions using silicalite","authors":"Mark T. Holtzapple,&nbsp;Russell F. Brown","doi":"10.1016/0956-9618(94)80025-1","DOIUrl":"10.1016/0956-9618(94)80025-1","url":null,"abstract":"<div><p>A novel method to recover dilute volatile solutes from aqueous solutions places pure silicalite powder in the annular space between two concentric porous pipes. Solute-rich fluid flows through the silicalite bed. When the bed is fully loaded, it is regenerated by passing steam through heat exchange tubes that are in intimate contact with the bed. In the case of ethanol, this system is able to produce 24wt% ethanol from a 1wt% solution in a single step. Because butanol is more nonpolar, the system is able to produce 50wt% butanol from a 1wt% solution in a single step. It is estimated that recovering 1% ethanol costs $0.0493/ L of 95% EtOH, whereas recovering 1% butanol costs $0.0277/L of pure BuOH. This cost is less than 4% of the selling price of butanol, which suggests this is a promising technique for product recovery in the acetone/butanol fermentation. This technology also has potential uses in removing volatile solutes from polluted water</p></div>","PeriodicalId":101160,"journal":{"name":"Separations Technology","volume":"4 4","pages":"Pages 213-229"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-9618(94)80025-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79994223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 27
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