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Determination of competitive adsorption isotherms of enantiomers on a dual-site adsorbent 双位点吸附剂对映体竞争吸附等温线的测定
Separations Technology Pub Date : 1995-11-01 DOI: 10.1016/0956-9618(95)00126-3
Lim Bee Gim, C. Ching, R. Tan
{"title":"Determination of competitive adsorption isotherms of enantiomers on a dual-site adsorbent","authors":"Lim Bee Gim, C. Ching, R. Tan","doi":"10.1016/0956-9618(95)00126-3","DOIUrl":"https://doi.org/10.1016/0956-9618(95)00126-3","url":null,"abstract":"","PeriodicalId":101160,"journal":{"name":"Separations Technology","volume":"43 1","pages":"213-228"},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79158411","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
Determination of competitive adsorption isotherms of enantiomers on a dual-site adsorbent 双位点吸附剂对映体竞争吸附等温线的测定
Separations Technology Pub Date : 1995-11-01 DOI: 10.1016/0956-9618(95)00126-3
Bee-Gim Lim, Chi-Bun Ching, Reginald B.H. Tan
{"title":"Determination of competitive adsorption isotherms of enantiomers on a dual-site adsorbent","authors":"Bee-Gim Lim,&nbsp;Chi-Bun Ching,&nbsp;Reginald B.H. Tan","doi":"10.1016/0956-9618(95)00126-3","DOIUrl":"https://doi.org/10.1016/0956-9618(95)00126-3","url":null,"abstract":"<div><p>The competitive adsorption isotherms of praziquantel enantiomers on microcrystalline cellulose triacetate were determined by concentration pulse chromatography. A model comprising a non-selective linear term and a selective first order improved Langmuir term was found to fit the data excellently. It is postulated that this chiral stationary phase consists of two types of binding sites: one responsible for the chiral, selective interactions and one responsible for the achiral, non-selective interactions of the enantiomers with the stationary phase. The selective sites are easily saturated compared to the non-selective sites, accounting for the experimental observation of lower separation efficiency at higher enantiomer concentrations.</p></div>","PeriodicalId":101160,"journal":{"name":"Separations Technology","volume":"5 4","pages":"Pages 213-228"},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-9618(95)00126-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91756508","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
Separation of pseudocumene from naphtha cracking raffinate by adductive crystallization using thiourea 硫脲内收结晶法分离石脑油裂化尾油中的伪木烯
Separations Technology Pub Date : 1995-11-01 DOI: 10.1016/0956-9618(95)00122-0
Kwang-Joo Kim ∗ , Jung-Min Lee , Seung-Kon Ryu
{"title":"Separation of pseudocumene from naphtha cracking raffinate by adductive crystallization using thiourea","authors":"Kwang-Joo Kim ∗ ,&nbsp;Jung-Min Lee ,&nbsp;Seung-Kon Ryu","doi":"10.1016/0956-9618(95)00122-0","DOIUrl":"https://doi.org/10.1016/0956-9618(95)00122-0","url":null,"abstract":"<div><p>Separation of pseudocumene from the C<sub>9</sub> aromatic raffinates found in naphtha cracking by thiourea adduction was studied. For the trimethylbenzene isomers, the tendency for adduct formation with thiourea was found to be pseudocumene &gt; hemimellitene /ggr/ mesitylene, and for the ethyltoluene isomers, <em>p</em>-ethyltoluene&gt;<em>o</em>-ethyltoluene &gt;<em>m</em>-ethyltoluene. From the eight cases of binary mixtures of C<sub>9</sub> aromatic compounds studied, separation by adduction with thiourea was more efficient than either distillation or extractive crystallization. Specifically, one adduction stage was approximately 5.4–58.0 times greater than one theoretical distillation stage. Similarly, the entrapping capacity by one adduction stage was approximately six times greater than that of extractive crystallization. Pseudocumene of purity of 99.7 wt% may be obtained from C<sub>9</sub> aromatic mixtures with the use of four thiourea adduction stages.</p></div>","PeriodicalId":101160,"journal":{"name":"Separations Technology","volume":"5 4","pages":"Pages 187-195"},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-9618(95)00122-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91756509","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: 4
Methodology for fractionating suspended particles using ultrasonic standing wave and divided flow fields 用超声驻波和分流场分选悬浮颗粒的方法学
Separations Technology Pub Date : 1995-11-01 DOI: 10.1016/0956-9618(95)00130-1
Dwayne A. Johnson, D. Feke
{"title":"Methodology for fractionating suspended particles using ultrasonic standing wave and divided flow fields","authors":"Dwayne A. Johnson, D. Feke","doi":"10.1016/0956-9618(95)00130-1","DOIUrl":"https://doi.org/10.1016/0956-9618(95)00130-1","url":null,"abstract":"","PeriodicalId":101160,"journal":{"name":"Separations Technology","volume":"19 1","pages":"251-258"},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78268920","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: 85
Purification of oily wastewater by ultrafiltration 含油废水的超滤净化
Separations Technology Pub Date : 1995-11-01 DOI: 10.1016/0956-9618(95)00123-9
K. Karakulski , A. Kozlowski , A.W. Morawski
{"title":"Purification of oily wastewater by ultrafiltration","authors":"K. Karakulski ,&nbsp;A. Kozlowski ,&nbsp;A.W. Morawski","doi":"10.1016/0956-9618(95)00123-9","DOIUrl":"https://doi.org/10.1016/0956-9618(95)00123-9","url":null,"abstract":"<div><p>Investigations have been carried out for purification of oily wastewater by a combination of ultrafiltration/reverse osmosis processes. A tubular ultrafiltration system using cellulosic and non-cellulosic membranes was tested with typical oily wastewater collected from harbour and simulated emulsion without any pretreatment. Both membrane types produced a permeate with an oil content generally less than 10 mg/dm<sup>3</sup>. Rejection of chemical oxygen demand (COD) is 80% for ultrafiltration treatment. The permeate is generally of acceptable quality for direct sewer discharge. For further treatment of UF permeate, reverse osmosis was applied with tubular B1 PCI modules using cellulose acetate membranes. The rejection of COD after ultrafiltration/reverse osmosis treatment increased up to 98.5% and total dissolved solids (TDS) to 95.7%. Reverse osmosis treatment will permit reuse of the treated water as process water.</p></div>","PeriodicalId":101160,"journal":{"name":"Separations Technology","volume":"5 4","pages":"Pages 197-205"},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-9618(95)00123-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91676540","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: 61
Bulk separation of hydrogen mixtures by a one-column PSA process 用一柱PSA法分离氢混合物
Separations Technology Pub Date : 1995-11-01 DOI: 10.1016/0956-9618(95)00128-X
Jaeyoung Yang , Sangsup Han , Chanhwi Cho , Chang-Ha Lee , Hanju Lee
{"title":"Bulk separation of hydrogen mixtures by a one-column PSA process","authors":"Jaeyoung Yang ,&nbsp;Sangsup Han ,&nbsp;Chanhwi Cho ,&nbsp;Chang-Ha Lee ,&nbsp;Hanju Lee","doi":"10.1016/0956-9618(95)00128-X","DOIUrl":"https://doi.org/10.1016/0956-9618(95)00128-X","url":null,"abstract":"<div><p>An experimental and theoretical study was performed for bulk separation of two binary systems — <span><math><mtext>H</mtext><msub><mi></mi><mn>2</mn></msub><mtext>CO</mtext><msub><mi></mi><mn>2</mn></msub></math></span> and <span><math><mtext>H</mtext><msub><mi></mi><mn>2</mn></msub><mtext>CO</mtext></math></span> mixture (<span><math><mtext>70</mtext><mtext>30</mtext></math></span> volume %) — by one-column PSA with zeolite 5A, a process widely used commercially in conjunction with catalytic steam reforming of natural gas or naphtha. In order to establish the optimal adsorption/desorption conditions of the PSA process, the dynamics of the adsorption/desorption process were studied through breakthrough and desorption experiments under various conditions. The purge-to-feed ratio was found important to H<sub>2</sub> product purity for cases with long adsorption step time. By cycling the pressure of a bed of zeolite between 1 atm and 11 atm and at ambient temperatures, H<sub>2</sub> could be concentrated from 70% in the feed to a product of 99.99% with a H<sub>2</sub> recovery of 67.5% for <span><math><mtext>H</mtext><msub><mi></mi><mn>2</mn></msub><mtext>CO</mtext><msub><mi></mi><mn>2</mn></msub></math></span> mixture and 97.09% with a H<sub>2</sub> recovery of 65.35% for <span><math><mtext>H</mtext><msub><mi></mi><mn>2</mn></msub><mtext>CO</mtext></math></span> mixture. Information concerning the function of each step in the cyclic process was given. The performance of all the five steps of the PSA process can be predicted by the LDF model together with the energy balance and equilibrium relationships. In applying the LDF model, the effective diffusivities (<em>D</em><sub>e</sub>) were obtained independently from up take curves of H<sub>2</sub>, CO<sub>2</sub>, and CO by zeolite. The Langmuir-Freundlich isotherm was used to correlate the experimental equilibrium data and was very well fitted to the results.</p></div>","PeriodicalId":101160,"journal":{"name":"Separations Technology","volume":"5 4","pages":"Pages 239-249"},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-9618(95)00128-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91676541","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: 36
Kinetics and mechanism of removal of 2, 4-dimethyl phenol from aqueous solutions with coal fly ash 粉煤灰去除水中2,4 -二甲基苯酚的动力学及机理
Separations Technology Pub Date : 1995-11-01 DOI: 10.1016/0956-9618(95)00124-7
D. Batabyal, A. Sahu, S.K. Chaudhuri
{"title":"Kinetics and mechanism of removal of 2, 4-dimethyl phenol from aqueous solutions with coal fly ash","authors":"D. Batabyal,&nbsp;A. Sahu,&nbsp;S.K. Chaudhuri","doi":"10.1016/0956-9618(95)00124-7","DOIUrl":"https://doi.org/10.1016/0956-9618(95)00124-7","url":null,"abstract":"<div><p>Coal fly ash, a solid waste from thermal power stations was used to successfully remove 2,4-dimethyl phenol by adsorption from aqueous solutions. The rate of adsorption follows first order kinetics before attaining equilibrium. Both diffusional and kinetic resistances affect the rate of adsorption and their relative effects vary with operating temperatures. Equilibrium adsorption data satisfied both Langmuir and Freundlich isotherms.</p></div>","PeriodicalId":101160,"journal":{"name":"Separations Technology","volume":"5 4","pages":"Pages 179-186"},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-9618(95)00124-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89999209","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: 54
Pervaporative separation of carboxylic acid-water mixtures 羧酸-水混合物的过汽化分离
Separations Technology Pub Date : 1995-11-01 DOI: 10.1016/0956-9618(95)00129-8
M.M. Kabra, S.A. Netke, S.B. Sawant, J.B. Joshi, V.G. Pangarkar
{"title":"Pervaporative separation of carboxylic acid-water mixtures","authors":"M.M. Kabra,&nbsp;S.A. Netke,&nbsp;S.B. Sawant,&nbsp;J.B. Joshi,&nbsp;V.G. Pangarkar","doi":"10.1016/0956-9618(95)00129-8","DOIUrl":"10.1016/0956-9618(95)00129-8","url":null,"abstract":"<div><p>Pervaporative separation of aqueous solutions of propionic, butyric and iso-butyric acid has been studied using plain and filled silicone rubber membranes. All the three acids can be conveniently separated using plain silicone rubber membranes.</p></div>","PeriodicalId":101160,"journal":{"name":"Separations Technology","volume":"5 4","pages":"Pages 259-263"},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-9618(95)00129-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90719962","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: 6
A multiple-loop flotation column for wastewater treatment 用于废水处理的多回路浮选柱
Separations Technology Pub Date : 1995-08-01 DOI: 10.1016/0956-9618(94)00118-C
D.X. He, F.X. Ding , H. Hu, S.H. Chiang
{"title":"A multiple-loop flotation column for wastewater treatment","authors":"D.X. He,&nbsp;F.X. Ding ,&nbsp;H. Hu,&nbsp;S.H. Chiang","doi":"10.1016/0956-9618(94)00118-C","DOIUrl":"10.1016/0956-9618(94)00118-C","url":null,"abstract":"<div><p>The application of the conventional flotation column to wastewater treatment has failed to realize its full. potential, mainly because of inadequate mixing (or backmixing) and non-uniform dispersion of bubbles in the column. Thus, the challenge lies in the development of a mechanical design, which can provide proper hydrodynamic conditions that will result in efficient separation, with high throughput. This paper describes a new column design, in which multiple draft tubes were used. Test results demonstrate that this new design is superior to that of the conventional flotation column for wastewater treatment.</p></div>","PeriodicalId":101160,"journal":{"name":"Separations Technology","volume":"5 3","pages":"Pages 133-138"},"PeriodicalIF":0.0,"publicationDate":"1995-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-9618(94)00118-C","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75972868","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: 7
Collagen dispersions for liquid-solid separations in water treatment and sludge dewatering 用于水处理和污泥脱水液固分离的胶原蛋白分散体
Separations Technology Pub Date : 1995-08-01 DOI: 10.1016/0956-9618(94)00120-H
John F. Davis , Gennaro J. Maffia
{"title":"Collagen dispersions for liquid-solid separations in water treatment and sludge dewatering","authors":"John F. Davis ,&nbsp;Gennaro J. Maffia","doi":"10.1016/0956-9618(94)00120-H","DOIUrl":"10.1016/0956-9618(94)00120-H","url":null,"abstract":"<div><p>Studies were conducted to evaluate potential applications of collagen dispersions in liquid-solid separation processes for water treatment and sludge dewatering. The collagen dispersion was prepared from fibrillar type I bovine hide buffered with organic acid. The results indicate that the collagen dispersion was effective as a coagulant for removing turbidity caused by colloidal clay particles and as a sludge conditioner for thickening and dewatering sludge from a water treatment plant. Coagulation of kaolin suspensions using the collagen reduced the initial turbidity of the suspension by 92%. Additions of collagen to sludge from a water treatment plant improved the settling rate during gravity thickening by a factor of five and improved the specific cake resistance of the sludge during filtration by a factor of three. Research is continuing on the mechanisms and kinetics of collagen dispersions in coagulation and sludge dewatering.</p></div>","PeriodicalId":101160,"journal":{"name":"Separations Technology","volume":"5 3","pages":"Pages 147-152"},"PeriodicalIF":0.0,"publicationDate":"1995-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-9618(94)00120-H","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90305546","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: 9
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