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Energy requirement of a distillation/membrane parallel hybrid / Etienne Ayotte-Sauvé in Industrial & engineering chemistry research, Vol. 49 N° 5 (Mars 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) Titre : Energy requirement of a distillation/membrane parallel hybrid : a thermodynamic approach Type de document : texte imprimé Auteurs : Etienne Ayotte-Sauvé, Auteur ; Mikhail Sorin, Auteur ; Fernand Rheault, Auteur Année de publication : 2010 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Energy  Requirement;  Power  of  separation;  Distillation;  Membrane  Parallel  Hybrid Résumé : This paper presents a new thermodynamic approach, based on the notion of power of separation, for the retrofit problem of finding the minimal energy requirement of an existing binary distillation column when coupling it in parallel with a membrane unit. A new geometric interpretation of this concept, which is supported by a rigorous mathematical proof, is introduced. From it results an efficient and accurate shortcut method to tackle the aforementioned problem. Numerical examples are considered for the energy intensive separation of olefins from paraffins, namely the retrofit of a C3-splitter and the retrofit of a C2-splitter through parallel hybridization with facilitated transport membranes. The results of the proposed shortcut method are compared to those obtained via the nonlinear programming optimization solvers GAMS-CONOPT and GAMS-CoinIpopt for a superstructure based problem formulation, which act as a reference. In both case studies, the shortcut method results in a significant reduction in problem size and in the number of solver iterations, while yielding only a small error on the minimal energy requirement of the column within the hybrid and on the hybrid architecture (i.e., the position of side-streams along the column). It could therefore be used to carry out a rapid screening of alternatives (e.g., different membrane technologies) in order to evaluate potential energy improvements. The proposed approach could also provide mathematical programming algorithms with a good initial guess of the solution. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9009155 [article] Energy requirement of a distillation/membrane parallel hybrid : a thermodynamic approach [texte imprimé] / Etienne Ayotte-Sauvé, Auteur ; Mikhail Sorin, Auteur ; Fernand Rheault, Auteur . - 2010. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) Mots-clés : Energy  Requirement;  Power  of  separation;  Distillation;  Membrane  Parallel  Hybrid Résumé : This paper presents a new thermodynamic approach, based on the notion of power of separation, for the retrofit problem of finding the minimal energy requirement of an existing binary distillation column when coupling it in parallel with a membrane unit. A new geometric interpretation of this concept, which is supported by a rigorous mathematical proof, is introduced. From it results an efficient and accurate shortcut method to tackle the aforementioned problem. Numerical examples are considered for the energy intensive separation of olefins from paraffins, namely the retrofit of a C3-splitter and the retrofit of a C2-splitter through parallel hybridization with facilitated transport membranes. The results of the proposed shortcut method are compared to those obtained via the nonlinear programming optimization solvers GAMS-CONOPT and GAMS-CoinIpopt for a superstructure based problem formulation, which act as a reference. In both case studies, the shortcut method results in a significant reduction in problem size and in the number of solver iterations, while yielding only a small error on the minimal energy requirement of the column within the hybrid and on the hybrid architecture (i.e., the position of side-streams along the column). It could therefore be used to carry out a rapid screening of alternatives (e.g., different membrane technologies) in order to evaluate potential energy improvements. The proposed approach could also provide mathematical programming algorithms with a good initial guess of the solution. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9009155

Energy requirements of distillation / Etienne Ayotte-Sauvé in Industrial & engineering chemistry research, Vol. 49 N° 11 (Juin 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 11 (Juin 2010) . - pp. 5439–5449 Titre : Energy requirements of distillation : exergy, pinch points, and the reversible column Type de document : texte imprimé Auteurs : Etienne Ayotte-Sauvé, Auteur ; Mikhail Sorin, Auteur Année de publication : 2010 Article en page(s) : pp. 5439–5449 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Distillation  Pinch  Points Résumé : This paper considers the problem of finding minimum energy requirements of a single-feed adiabatic distillation column for a given separation task. Over the years, many attempts to understand this problem have been made. This paper presents an approach which is at the intersection of the thermodynamic and geometric points of view. In it, an analysis of multicomponent distillation is carried out via the notion of power of separation, which is akin to compositional exergy. It is shown mathematically that this concept, although taking its roots in thermodynamics, has a strong link with the geometry of liquid composition trajectories in multicomponent distillation and is also related to the traditional McCabe−Thiele diagram for binary distillation. By considering pinch-point curves for adiabatic column sections and their link with reversible column profiles, a characterization of minimal energy requirements of the single-feed adiabatic distillation process is proposed. As a consequence, a shortcut method to determine minimal energy requirements of multicomponent distillation is introduced. Examples validating this approach for multicomponent distillation of ideal, nonideal, zeotropic, and azeotropic mixtures with up to six components are presented. These examples indicate that the new method can, in principle, treat any number of mixture components. All types of pinch behavior are covered, that is, the method can find minimal energy designs associated to feed, saddle, or tangent pinch points. Case studies where pinched minimum energy solutions exist, where pinched solutions can be reduced to nonpinched solutions, and where no pinched solutions exist are presented. In all these cases, the new method can find, if they exist, pinched and nonpinched solutions. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100369f [article] Energy requirements of distillation : exergy, pinch points, and the reversible column [texte imprimé] / Etienne Ayotte-Sauvé, Auteur ; Mikhail Sorin, Auteur . - 2010 . - pp. 5439–5449. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 11 (Juin 2010) . - pp. 5439–5449 Mots-clés : Distillation  Pinch  Points Résumé : This paper considers the problem of finding minimum energy requirements of a single-feed adiabatic distillation column for a given separation task. Over the years, many attempts to understand this problem have been made. This paper presents an approach which is at the intersection of the thermodynamic and geometric points of view. In it, an analysis of multicomponent distillation is carried out via the notion of power of separation, which is akin to compositional exergy. It is shown mathematically that this concept, although taking its roots in thermodynamics, has a strong link with the geometry of liquid composition trajectories in multicomponent distillation and is also related to the traditional McCabe−Thiele diagram for binary distillation. By considering pinch-point curves for adiabatic column sections and their link with reversible column profiles, a characterization of minimal energy requirements of the single-feed adiabatic distillation process is proposed. As a consequence, a shortcut method to determine minimal energy requirements of multicomponent distillation is introduced. Examples validating this approach for multicomponent distillation of ideal, nonideal, zeotropic, and azeotropic mixtures with up to six components are presented. These examples indicate that the new method can, in principle, treat any number of mixture components. All types of pinch behavior are covered, that is, the method can find minimal energy designs associated to feed, saddle, or tangent pinch points. Case studies where pinched minimum energy solutions exist, where pinched solutions can be reduced to nonpinched solutions, and where no pinched solutions exist are presented. In all these cases, the new method can find, if they exist, pinched and nonpinched solutions. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100369f