Analysis of Local Recycle for Membrane Pervaporation Systems / Anton Santoso in Industrial & engineering chemistry research, Vol. 51 N° 29 (Juillet 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 29 (Juillet 2012) . - pp. 9790-9802 Titre : Analysis of Local Recycle for Membrane Pervaporation Systems Type de document : texte imprimé Auteurs : Anton Santoso, Auteur ; Cheng-Ching Yu, Auteur ; Jeffrey D. Ward, Auteur Année de publication : 2012 Article en page(s) : pp. 9790-9802 Note générale : Industrial chemoistry Langues : Anglais (eng) Mots-clés : Membrane separation Pervaporation Résumé : We present an analysis of local recycle in membrane pervaporation processes. Local recycle (reheating and recycling part of the retentate from a membrane unit back to the inlet) can mitigate the problem of temperature drop in pervaporation units. The excess fluid acts as a thermal carrier, increasing the temperature. However, a trade-off occurs because this recycle also decreases the concentration of the more permeable species on the retentate side of the membrane. We present a method based on dimensional analysis that can be used to quickly determine whether local recycle around a single membrane unit is desirable. We show that membrane modules can be classified into one of three types: local recycle is not desirable, local recycle is desirable with an intermediate recycle ratio, and local recycle is desirable with the maximum possible recycle ratio. The method is illustrated using three case studies, two of which are based on hybrid distillation/pervaporation processes. The results indicate that the correct application of internal recycle can significantly improve efficiency and reduce cost. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26184958 [article] Analysis of Local Recycle for Membrane Pervaporation Systems [texte imprimé] / Anton Santoso, Auteur ; Cheng-Ching Yu, Auteur ; Jeffrey D. Ward, Auteur . - 2012 . - pp. 9790-9802. Industrial chemoistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 29 (Juillet 2012) . - pp. 9790-9802 Mots-clés : Membrane separation Pervaporation Résumé : We present an analysis of local recycle in membrane pervaporation processes. Local recycle (reheating and recycling part of the retentate from a membrane unit back to the inlet) can mitigate the problem of temperature drop in pervaporation units. The excess fluid acts as a thermal carrier, increasing the temperature. However, a trade-off occurs because this recycle also decreases the concentration of the more permeable species on the retentate side of the membrane. We present a method based on dimensional analysis that can be used to quickly determine whether local recycle around a single membrane unit is desirable. We show that membrane modules can be classified into one of three types: local recycle is not desirable, local recycle is desirable with an intermediate recycle ratio, and local recycle is desirable with the maximum possible recycle ratio. The method is illustrated using three case studies, two of which are based on hybrid distillation/pervaporation processes. The results indicate that the correct application of internal recycle can significantly improve efficiency and reduce cost. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26184958

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Determination of catalyst loading and shortcut design for binary reactive distillation / Jian Kai Cheng in Industrial & engineering chemistry research, Vol. 49 N° 22 (Novembre 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11517-11529 Titre : Determination of catalyst loading and shortcut design for binary reactive distillation Type de document : texte imprimé Auteurs : Jian Kai Cheng, Auteur ; Jeffrey D. Ward, Auteur ; Cheng-Ching Yu, Auteur Année de publication : 2011 Article en page(s) : pp. 11517-11529 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Distillation with reaction Design Loading Catalyst Résumé : Determination of the catalyst mass is a challenging problem in the conceptual design of reactive distillation systems. In this work, we use the concept of countercurrent cascaded vapor-liquid reactors (CCRs) to develop a shortcut method for the design of binary reactive distillation columns. An analytical expression for the theoretical minimum catalyst loading can be derived as the number of CCRs approaches infinity. On the basis of this theoretical catalyst loading, we present a calculation procedure to obtain the catalyst mass and other basic process parameters, for example, number of reactive stages and number of separation stages, without a detailed model. Three real binary systems are used to illustrate this shortcut method, and the results show that the estimated shortcut designs are similar to the optimal designs. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23437850 [article] Determination of catalyst loading and shortcut design for binary reactive distillation [texte imprimé] / Jian Kai Cheng, Auteur ; Jeffrey D. Ward, Auteur ; Cheng-Ching Yu, Auteur . - 2011 . - pp. 11517-11529. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11517-11529 Mots-clés : Distillation with reaction Design Loading Catalyst Résumé : Determination of the catalyst mass is a challenging problem in the conceptual design of reactive distillation systems. In this work, we use the concept of countercurrent cascaded vapor-liquid reactors (CCRs) to develop a shortcut method for the design of binary reactive distillation columns. An analytical expression for the theoretical minimum catalyst loading can be derived as the number of CCRs approaches infinity. On the basis of this theoretical catalyst loading, we present a calculation procedure to obtain the catalyst mass and other basic process parameters, for example, number of reactive stages and number of separation stages, without a detailed model. Three real binary systems are used to illustrate this shortcut method, and the results show that the estimated shortcut designs are similar to the optimal designs. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23437850

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