Design and analysis of internally heat - integrated reactive distillation processes / Yang Jiao in Industrial & engineering chemistry research, Vol. 51 N° 10 (Mars 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 10 (Mars 2012) . - pp.4002-4016 Titre : Design and analysis of internally heat - integrated reactive distillation processes Type de document : texte imprimé Auteurs : Yang Jiao, Auteur ; San-Jang Wang, Auteur ; Kejin Huang, Auteur Année de publication : 2012 Article en page(s) : pp.4002-4016 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Heat integrated distillation Résumé : Process intensification is aimed at integrating different processes in design to reduce utility consumption and capital investment, as well as at achieving environmental and safety benefits. Internally heat-integrated distillation and reactive distillation are representative examples of such design technology. In this study, the performance of internally heat-integrated reactive distillation, a novel technology combining both internally heat-integrated distillation and reactive distillation, is investigated for three ideal reactive distillation processes with a reaction zone located at top, middle, and bottom, respectively, of a reactive distillation column. The influences of reaction thermal effect (i.e., exothermic or endothermic reaction), relative volatilities between components, and chemical equilibrium constants on total annualized cost (TAC) are examined. Simulation results demonstrate that the internally heat-integrated reactive distillation can provide better economic benefit than conventional reactive distillation if the reaction zone can be properly placed in the high-pressure section or in both high- and low-pressure sections. The most TAC reduction from the implementation of internal heat integration can be obtained for the reactive distillation column with the reaction zone located at column top. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202182h [article] Design and analysis of internally heat - integrated reactive distillation processes [texte imprimé] / Yang Jiao, Auteur ; San-Jang Wang, Auteur ; Kejin Huang, Auteur . - 2012 . - pp.4002-4016. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 10 (Mars 2012) . - pp.4002-4016 Mots-clés : Heat integrated distillation Résumé : Process intensification is aimed at integrating different processes in design to reduce utility consumption and capital investment, as well as at achieving environmental and safety benefits. Internally heat-integrated distillation and reactive distillation are representative examples of such design technology. In this study, the performance of internally heat-integrated reactive distillation, a novel technology combining both internally heat-integrated distillation and reactive distillation, is investigated for three ideal reactive distillation processes with a reaction zone located at top, middle, and bottom, respectively, of a reactive distillation column. The influences of reaction thermal effect (i.e., exothermic or endothermic reaction), relative volatilities between components, and chemical equilibrium constants on total annualized cost (TAC) are examined. Simulation results demonstrate that the internally heat-integrated reactive distillation can provide better economic benefit than conventional reactive distillation if the reaction zone can be properly placed in the high-pressure section or in both high- and low-pressure sections. The most TAC reduction from the implementation of internal heat integration can be obtained for the reactive distillation column with the reaction zone located at column top. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202182h

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Effect of entrainer loss on plant-wide design and control of an isopropanol dehydration process / San-Jang Wang in Industrial & engineering chemistry research, Vol. 47 N°17 (Septembre 2008)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 47 N°17 (Septembre 2008) . - p. 6672–6684 Titre : Effect of entrainer loss on plant-wide design and control of an isopropanol dehydration process Type de document : texte imprimé Auteurs : San-Jang Wang, Auteur ; David S. H. Wong, Auteur ; Shuh-Woei Yu, Auteur Année de publication : 2008 Article en page(s) : p. 6672–6684 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Plant-wide design Isopropanol dehydration system Azeotropic distillation Résumé : Azeotropic distillation is an important technology for separating azeotropes or minimizing the energy expenditure of separating close boiling mixtures. In heterogeneous azeotropic distillation, an entrainer is usually added, which is recovered and reused in the subsequent stripping process. Depending on the design, there may be various degrees of entrainer loss. In this work, the plant-wide design and control of an isopropanol dehydration system using cyclohexane as an entrainer via heterogeneous azeotropic distillation is conducted. When there is negligible entrainer loss, a special case of input multiplicity is found, in which a set of design specifications can be achieved by an infinite but bounded set of operating conditions. The optimal condition with the minimum reboiler duty in this bounded set is achieved when the organic recycle flow is the smallest. Due to the existence of these multiple steady states, the entrainer inventory control is self-regulatory over long time operations if a PI control is used for the level of the organic phase in the decanter. If large offsets are allowed in the entrainer inventory control, the system may exhibit a long period of pseudosteady state followed by catastrophic failure. Alternatively, one can allow a small amount of entrainer loss to the bottom of the heterogeneous azeotropic distillation column, and provide a small amount of entrainer makeup. In this case, a control loop is added to guard against process drift due to loss of entrainer. However, because continuous maintenance of entrainer inventory is difficult, an on−off control scheme of entrainer makeup feed is used. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8002683 [article] Effect of entrainer loss on plant-wide design and control of an isopropanol dehydration process [texte imprimé] / San-Jang Wang, Auteur ; David S. H. Wong, Auteur ; Shuh-Woei Yu, Auteur . - 2008 . - p. 6672–6684. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°17 (Septembre 2008) . - p. 6672–6684 Mots-clés : Plant-wide design Isopropanol dehydration system Azeotropic distillation Résumé : Azeotropic distillation is an important technology for separating azeotropes or minimizing the energy expenditure of separating close boiling mixtures. In heterogeneous azeotropic distillation, an entrainer is usually added, which is recovered and reused in the subsequent stripping process. Depending on the design, there may be various degrees of entrainer loss. In this work, the plant-wide design and control of an isopropanol dehydration system using cyclohexane as an entrainer via heterogeneous azeotropic distillation is conducted. When there is negligible entrainer loss, a special case of input multiplicity is found, in which a set of design specifications can be achieved by an infinite but bounded set of operating conditions. The optimal condition with the minimum reboiler duty in this bounded set is achieved when the organic recycle flow is the smallest. Due to the existence of these multiple steady states, the entrainer inventory control is self-regulatory over long time operations if a PI control is used for the level of the organic phase in the decanter. If large offsets are allowed in the entrainer inventory control, the system may exhibit a long period of pseudosteady state followed by catastrophic failure. Alternatively, one can allow a small amount of entrainer loss to the bottom of the heterogeneous azeotropic distillation column, and provide a small amount of entrainer makeup. In this case, a control loop is added to guard against process drift due to loss of entrainer. However, because continuous maintenance of entrainer inventory is difficult, an on−off control scheme of entrainer makeup feed is used. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8002683

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Plantwide design of ideal reactive distillation processes with thermal coupling / San-Jang Wang in Industrial & engineering chemistry research, Vol. 49 N° 7 (Avril 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 7 (Avril 2010) . - pp. 3262–3274 Titre : Plantwide design of ideal reactive distillation processes with thermal coupling Type de document : texte imprimé Auteurs : San-Jang Wang, Auteur ; Hao-Yeh Lee, Auteur ; Jui-Hung Ho, Auteur Année de publication : 2010 Article en page(s) : pp. 3262–3274 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Plantwide Design Distillation Thermal Coupling Résumé : Process intensification is aimed to integrate different processes in design to reduce energy consumption and capital investment, as well as to achieve environmental and safety benefits. Reactive distillation and thermally coupled distillation are examples of such process intensification. In this study, the performance of thermally coupled reactive distillation, a technology combining reactive distillation and thermally coupled distillation, is investigated for ideal quaternary reaction systems with different rankings of relative volatility. Possible configurations of thermally coupled reactive distillation are designed for systems of types IR, IIR, and IIIR with the excess design and type IIP with the stoichiometric design. Reactive distillation with thermal coupling is demonstrated to provide better energy efficiency than conventional reactive distillation. The remixing phenomenon associated with thermodynamic inefficiency in conventional distillation sequences can be reduced or eliminated by implementing thermal coupling between columns. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900786u [article] Plantwide design of ideal reactive distillation processes with thermal coupling [texte imprimé] / San-Jang Wang, Auteur ; Hao-Yeh Lee, Auteur ; Jui-Hung Ho, Auteur . - 2010 . - pp. 3262–3274. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 7 (Avril 2010) . - pp. 3262–3274 Mots-clés : Plantwide Design Distillation Thermal Coupling Résumé : Process intensification is aimed to integrate different processes in design to reduce energy consumption and capital investment, as well as to achieve environmental and safety benefits. Reactive distillation and thermally coupled distillation are examples of such process intensification. In this study, the performance of thermally coupled reactive distillation, a technology combining reactive distillation and thermally coupled distillation, is investigated for ideal quaternary reaction systems with different rankings of relative volatility. Possible configurations of thermally coupled reactive distillation are designed for systems of types IR, IIR, and IIIR with the excess design and type IIP with the stoichiometric design. Reactive distillation with thermal coupling is demonstrated to provide better energy efficiency than conventional reactive distillation. The remixing phenomenon associated with thermodynamic inefficiency in conventional distillation sequences can be reduced or eliminated by implementing thermal coupling between columns. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900786u

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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

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