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

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

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

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Effects of relative volatility ranking on design and control of reactive distillation systems with ternary decomposition reactions / Chin-Shih Chen in Industrial & engineering chemistry research, Vol. 47 n°14 (Juillet 2008)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4830–4844 Titre : Effects of relative volatility ranking on design and control of reactive distillation systems with ternary decomposition reactions Type de document : texte imprimé Auteurs : Chin-Shih Chen, Auteur ; Cheng-Ching Yu, Auteur Année de publication : 2008 Article en page(s) : p. 4830–4844 Langues : Anglais (eng) Mots-clés : Reactive distillation systems  One-column configuration  Two-column configuration Résumé : Design and control of reactive distillation systems of ternary decomposition reactions with two different relative volatility rankings, IK ↔ LK + HK and HK ↔ LK + IK, have been explored. Systems with intermediate boiling reactant have a behavior that is similar to that of the quaternary system with intermediate boiling reactants, if not simpler. Systems with heavy reactant are quite different. Two possible flowsheets (two-column and one-column configurations) have been discussed. The two-column flowsheet is workable for a wide range of chemical equilibrium constants. The one-column configuration is feasible for systems with high chemical equilibrium constants. Economical comparisons reveal that the one-column configuration is preferred for systems with large equilibrium constants while the two-column configuration is more economical in the region of low equilibrium constants. For the control of nonlinear reactive distillation systems, fast measurement (temperature measurement) is essential for tight control. Control performance deteriorates if significant measurement delay is present. Thus, parallel cascade control offers an attractive alternative for the control of reactive distillation systems in an offset free manner. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701787e [article] Effects of relative volatility ranking on design and control of reactive distillation systems with ternary decomposition reactions [texte imprimé] / Chin-Shih Chen, Auteur ; Cheng-Ching Yu, Auteur . - 2008 . - p. 4830–4844. Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4830–4844 Mots-clés : Reactive distillation systems  One-column configuration  Two-column configuration Résumé : Design and control of reactive distillation systems of ternary decomposition reactions with two different relative volatility rankings, IK ↔ LK + HK and HK ↔ LK + IK, have been explored. Systems with intermediate boiling reactant have a behavior that is similar to that of the quaternary system with intermediate boiling reactants, if not simpler. Systems with heavy reactant are quite different. Two possible flowsheets (two-column and one-column configurations) have been discussed. The two-column flowsheet is workable for a wide range of chemical equilibrium constants. The one-column configuration is feasible for systems with high chemical equilibrium constants. Economical comparisons reveal that the one-column configuration is preferred for systems with large equilibrium constants while the two-column configuration is more economical in the region of low equilibrium constants. For the control of nonlinear reactive distillation systems, fast measurement (temperature measurement) is essential for tight control. Control performance deteriorates if significant measurement delay is present. Thus, parallel cascade control offers an attractive alternative for the control of reactive distillation systems in an offset free manner. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701787e

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

A New shortcut design method and economic analysis of divided wall columns / Kai-Ti Chu in Industrial & engineering chemistry research, Vol. 50 N° 15 (Août 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp.9221–9235 Titre : A New shortcut design method and economic analysis of divided wall columns Type de document : texte imprimé Auteurs : Kai-Ti Chu, Auteur ; Loic Cadoret, Auteur ; Cheng-Ching Yu, Auteur Année de publication : 2011 Article en page(s) : pp.9221–9235 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Wall Columns Résumé : Divided wall columns (DWCs) can save energy and capital costs compared with traditional distillation columns; however, the design of DWCs is more difficult because there are more degrees of freedom. This paper describes a novel short-cut method that can be used to rapidly determine near-optimal values of important design parameters, including the reflux ratio, number of stages in all sections, and split liquid and vapor ratios for the three most common types of DWCs. The method is based on the development of a rational and efficient net flow model and the application of the methods of Fenske, Underwood, and Gilliland and the Kirkbride equation. The method is applied to two real systems, and the results are compared with results from rigorous simulations and optimization. The results show that the shortcut method leads to a process similar to a feasible actual process, and the total annual cost (TAC) based on the design method is close to the minimum (optimum) total annual cost. The results also show that the method also provides good initial values for rigorous optimization. The method is also applied to a fictitious process consisting of three components with constant relative volatilities, for different values of the ease of separation index (ESI), overall split difficulty, and feed composition. The results indicate that the method works well for a variety of process conditions and that the minimum vapor flow rate is a good surrogate for the total cost of process operation. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200234p [article] A New shortcut design method and economic analysis of divided wall columns [texte imprimé] / Kai-Ti Chu, Auteur ; Loic Cadoret, Auteur ; Cheng-Ching Yu, Auteur . - 2011 . - pp.9221–9235. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp.9221–9235 Mots-clés : Wall Columns Résumé : Divided wall columns (DWCs) can save energy and capital costs compared with traditional distillation columns; however, the design of DWCs is more difficult because there are more degrees of freedom. This paper describes a novel short-cut method that can be used to rapidly determine near-optimal values of important design parameters, including the reflux ratio, number of stages in all sections, and split liquid and vapor ratios for the three most common types of DWCs. The method is based on the development of a rational and efficient net flow model and the application of the methods of Fenske, Underwood, and Gilliland and the Kirkbride equation. The method is applied to two real systems, and the results are compared with results from rigorous simulations and optimization. The results show that the shortcut method leads to a process similar to a feasible actual process, and the total annual cost (TAC) based on the design method is close to the minimum (optimum) total annual cost. The results also show that the method also provides good initial values for rigorous optimization. The method is also applied to a fictitious process consisting of three components with constant relative volatilities, for different values of the ease of separation index (ESI), overall split difficulty, and feed composition. The results indicate that the method works well for a variety of process conditions and that the minimum vapor flow rate is a good surrogate for the total cost of process operation. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200234p

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Plantwide design of transesterification reactive distillation to co-generate ethyl acetate and n-butanol / San-Jang Wang in Industrial & engineering chemistry research, Vol. 49 N° 2 (Janvier 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 2 (Janvier 2010) . - pp 750–760 Titre : Plantwide design of transesterification reactive distillation to co-generate ethyl acetate and n-butanol Type de document : texte imprimé Auteurs : San-Jang Wang, Auteur ; Hsiao-Ping Huang, Auteur ; Cheng-Ching Yu, Auteur Année de publication : 2010 Article en page(s) : pp 750–760 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Reactive distillation RD Ethyl Acetat N-Butanol. Résumé : Reactive distillation (RD) in the face of azeotrope(s) in the separation of a mixture from an RD column might need debottlenecking design and more columns to obtain high-purity products. Under such circumstances, the integration of heat with the process becomes an effective consideration for reducing costs. In this study, an RD process to produce ethyl acetate and n-butanol from ethanol and n-butyl acetate by conducting a transesterification reaction is presented. The products from the RD column include n-butanol and an ethanol/ethyl acetate mixture. Designs with alternative configurations are used to illustrate plantwide designs of the process with heat integration/coupling. Among these alternatives are two with three columns and one with two columns. In the three-column configurations, separation of ethanol/ethyl-acetate mixtures from the top product of the RD column is conducted by extractive distillation or pressure-swing distillation. The other configuration consists of an RD column followed by a conventional distillation column operated at high pressure. Systematic design procedures are used to optimize the flowsheets of different configurations by minimizing the total annual cost. Heat integration and thermal coupling technologies are used in these three configurations to attempt to provide more economical designs. The results show that the selection of separation system depends on whether heat integration/coupling is considered. In this case, the two-column reactive distillation process with heat integration yields high-purity products and the lowest total annual cost. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901413c [article] Plantwide design of transesterification reactive distillation to co-generate ethyl acetate and n-butanol [texte imprimé] / San-Jang Wang, Auteur ; Hsiao-Ping Huang, Auteur ; Cheng-Ching Yu, Auteur . - 2010 . - pp 750–760. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 2 (Janvier 2010) . - pp 750–760 Mots-clés : Reactive distillation RD Ethyl Acetat N-Butanol. Résumé : Reactive distillation (RD) in the face of azeotrope(s) in the separation of a mixture from an RD column might need debottlenecking design and more columns to obtain high-purity products. Under such circumstances, the integration of heat with the process becomes an effective consideration for reducing costs. In this study, an RD process to produce ethyl acetate and n-butanol from ethanol and n-butyl acetate by conducting a transesterification reaction is presented. The products from the RD column include n-butanol and an ethanol/ethyl acetate mixture. Designs with alternative configurations are used to illustrate plantwide designs of the process with heat integration/coupling. Among these alternatives are two with three columns and one with two columns. In the three-column configurations, separation of ethanol/ethyl-acetate mixtures from the top product of the RD column is conducted by extractive distillation or pressure-swing distillation. The other configuration consists of an RD column followed by a conventional distillation column operated at high pressure. Systematic design procedures are used to optimize the flowsheets of different configurations by minimizing the total annual cost. Heat integration and thermal coupling technologies are used in these three configurations to attempt to provide more economical designs. The results show that the selection of separation system depends on whether heat integration/coupling is considered. In this case, the two-column reactive distillation process with heat integration yields high-purity products and the lowest total annual cost. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901413c

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire