Modified bounded homotopies in the solving of phase stability problems for liquid-liquid phase-splitting calculations / Jani Kangas in Industrial & engineering chemistry research, Vol. 50 N° 11 (Juin 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp. 7003-7018 Titre : Modified bounded homotopies in the solving of phase stability problems for liquid-liquid phase-splitting calculations Type de document : texte imprimé Auteurs : Jani Kangas, Auteur ; Ilkka Malinen, Auteur ; Juha Tanskanen, Auteur Année de publication : 2011 Article en page(s) : pp. 7003-7018 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Liquid phase Phase stability Homotopy Résumé : In this study, the modified bounded homotopies presented by Malinen and Tanskanen (Malinen, L; Tanskanen, J. Modified bounded homotopies to enable a narrow bounding zone. Chem. Eng. Sci. 2008, 63, 3419) are investigated in order to solve phase stability analysis problems in liquid―liquid equilibrium cases for phase-splitting calculations. The tangent-plane distance criterion is used to analyze the phase stability. The emphasis is on approaching the first root on the homotopy path. According to the observations, the bounding of the homotopy path with respect to the problem variables aids in the solving of a phase stability analysis problem. The main shortcomings of the modified bounded Newton, affine, and fixed-point homotopies are the starting point isolas, the existence of unfeasible solutions, and the convergence to only certain roots, respectively. The attraction domain of the global minimum was observed to be the largest with the fixed-point homotopy. Sequential usage of the fixed-point homotopy and starting points near pure components results in a robust algorithm for phase stability analysis and gives feasible initial estimates for the solving of phase splitting. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24199919 [article] Modified bounded homotopies in the solving of phase stability problems for liquid-liquid phase-splitting calculations [texte imprimé] / Jani Kangas, Auteur ; Ilkka Malinen, Auteur ; Juha Tanskanen, Auteur . - 2011 . - pp. 7003-7018. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp. 7003-7018 Mots-clés : Liquid phase Phase stability Homotopy Résumé : In this study, the modified bounded homotopies presented by Malinen and Tanskanen (Malinen, L; Tanskanen, J. Modified bounded homotopies to enable a narrow bounding zone. Chem. Eng. Sci. 2008, 63, 3419) are investigated in order to solve phase stability analysis problems in liquid―liquid equilibrium cases for phase-splitting calculations. The tangent-plane distance criterion is used to analyze the phase stability. The emphasis is on approaching the first root on the homotopy path. According to the observations, the bounding of the homotopy path with respect to the problem variables aids in the solving of a phase stability analysis problem. The main shortcomings of the modified bounded Newton, affine, and fixed-point homotopies are the starting point isolas, the existence of unfeasible solutions, and the convergence to only certain roots, respectively. The attraction domain of the global minimum was observed to be the largest with the fixed-point homotopy. Sequential usage of the fixed-point homotopy and starting points near pure components results in a robust algorithm for phase stability analysis and gives feasible initial estimates for the solving of phase splitting. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24199919

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Thermally coupled side-column configurations enabling distillation boundary crossing. 1. an overview and a solving procedure / Ilkka Malinen in Industrial & engineering chemistry research, Vol. 48 N° 13 (Juillet 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6387–6404 Titre : Thermally coupled side-column configurations enabling distillation boundary crossing. 1. an overview and a solving procedure Type de document : texte imprimé Auteurs : Ilkka Malinen, Auteur ; Juha Tanskanen, Auteur Année de publication : 2009 Article en page(s) : pp. 6387–6404 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Thermally coupled side-rectifier Side-stripper configurations Component sets Curved distillation boundary Résumé : In this paper, the thermally coupled side-rectifier and side-stripper configurations are studied in the separation of component sets with a curved distillation boundary. A solving procedure is introduced that can be used in the determination of the minimum total energy consumption for the studied complex separation structures. The results show that thermally coupled side-column configurations enable distillation boundary crossing with high product flow purities. In fact, the achievable purities are higher than is possible with conventional column sequences. It is also noted that in some methanol/ethanol/water separations the energy consumption of the thermally coupled side-stripper configuration may partly decrease with increasing methanol distillate purity. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800817n [article] Thermally coupled side-column configurations enabling distillation boundary crossing. 1. an overview and a solving procedure [texte imprimé] / Ilkka Malinen, Auteur ; Juha Tanskanen, Auteur . - 2009 . - pp. 6387–6404. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6387–6404 Mots-clés : Thermally coupled side-rectifier Side-stripper configurations Component sets Curved distillation boundary Résumé : In this paper, the thermally coupled side-rectifier and side-stripper configurations are studied in the separation of component sets with a curved distillation boundary. A solving procedure is introduced that can be used in the determination of the minimum total energy consumption for the studied complex separation structures. The results show that thermally coupled side-column configurations enable distillation boundary crossing with high product flow purities. In fact, the achievable purities are higher than is possible with conventional column sequences. It is also noted that in some methanol/ethanol/water separations the energy consumption of the thermally coupled side-stripper configuration may partly decrease with increasing methanol distillate purity. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800817n

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Thermally coupled side-column configurations enabling distillation boundary crossing. 2. effects of intermediate heat exchangers / Ilkka Malinen in Industrial & engineering chemistry research, Vol. 48 N° 13 (Juillet 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6372–6386 Titre : Thermally coupled side-column configurations enabling distillation boundary crossing. 2. effects of intermediate heat exchangers Type de document : texte imprimé Auteurs : Ilkka Malinen, Auteur ; Juha Tanskanen, Auteur Année de publication : 2009 Article en page(s) : pp. 6372–6386 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Thermally coupled side-column configurations Heat exchangers Curved distillation boundary Résumé : In this paper, the benefits of intermediate heat exchangers situated in thermally coupled side-column configurations are examined in the separation of component sets having a curved distillation boundary. The simulation results indicate that by incorporating an intermediate heat exchanger the distillation boundary crossing can be enhanced. In consequence, pure product flows may be achieved with decreased total energy requirement. It is also found that thermally coupled side-column configurations having an intermediate heat exchanger require less energy to carry out the desired separation than do the corresponding conventional direct and indirect column schemes. Regardless of the increased complexity and possibility for multiple steady states, intermediate heat exchangers always improve thermodynamic efficiency and widen the potential for heat integration. This paper complements the study started in Part 1 [Malinen, I.; Tanskanen, J. Thermally coupled side-column configurations enabling distillation boundary crossing. 1. An Overview and a solving procedure. Ind. Eng. Chem. Res. 2009, 48, DOI: 10.1021/ie800817n] of this series of papers. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800818y [article] Thermally coupled side-column configurations enabling distillation boundary crossing. 2. effects of intermediate heat exchangers [texte imprimé] / Ilkka Malinen, Auteur ; Juha Tanskanen, Auteur . - 2009 . - pp. 6372–6386. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6372–6386 Mots-clés : Thermally coupled side-column configurations Heat exchangers Curved distillation boundary Résumé : In this paper, the benefits of intermediate heat exchangers situated in thermally coupled side-column configurations are examined in the separation of component sets having a curved distillation boundary. The simulation results indicate that by incorporating an intermediate heat exchanger the distillation boundary crossing can be enhanced. In consequence, pure product flows may be achieved with decreased total energy requirement. It is also found that thermally coupled side-column configurations having an intermediate heat exchanger require less energy to carry out the desired separation than do the corresponding conventional direct and indirect column schemes. Regardless of the increased complexity and possibility for multiple steady states, intermediate heat exchangers always improve thermodynamic efficiency and widen the potential for heat integration. This paper complements the study started in Part 1 [Malinen, I.; Tanskanen, J. Thermally coupled side-column configurations enabling distillation boundary crossing. 1. An Overview and a solving procedure. Ind. Eng. Chem. Res. 2009, 48, DOI: 10.1021/ie800817n] of this series of papers. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800818y

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