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Sequential approach to design batch distillation processes for homogeneous azeotropic systems / Vincentius Surya Kurnia Adi in Industrial & engineering chemistry research, Vol. 49 N° 9 (Mai 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 9 (Mai 2010) . - pp. 4308–4328 Titre : Sequential approach to design batch distillation processes for homogeneous azeotropic systems Type de document : texte imprimé Auteurs : Vincentius Surya Kurnia Adi, Auteur ; Chuei-Tin Chang, Auteur Année de publication : 2010 Article en page(s) : pp. 4308–4328 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Azeotropic  Systems Résumé : By addressing both flowsheeting and scheduling issues, a systematic approach is developed in this work to design batch azeotropic distillation processes for the homogeneous ternary and quaternary systems. The proposed design strategy is implemented sequentially in three stages. First, an integer program (IP) is formulated for producing the optimal structure of state-task network (STN). A nonlinear program (NLP) is then developed to generate the corresponding material-balance constraints. In the final step, a mixed integer linear programming (MILP) model and a mixed integer nonlinear programming (MINLP) model are constructed for stipulating the optimal short-term and cyclic schedules respectively. The conventional concept of event points is adopted to facilitate the continuous-time representation in these model formulations. The implementation procedure is illustrated with two example systems in this paper. Satisfactory process configurations and production schedules can both be produced in all the cases we have studied so far. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100101w [article] Sequential approach to design batch distillation processes for homogeneous azeotropic systems [texte imprimé] / Vincentius Surya Kurnia Adi, Auteur ; Chuei-Tin Chang, Auteur . - 2010 . - pp. 4308–4328. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 9 (Mai 2010) . - pp. 4308–4328 Mots-clés : Azeotropic  Systems Résumé : By addressing both flowsheeting and scheduling issues, a systematic approach is developed in this work to design batch azeotropic distillation processes for the homogeneous ternary and quaternary systems. The proposed design strategy is implemented sequentially in three stages. First, an integer program (IP) is formulated for producing the optimal structure of state-task network (STN). A nonlinear program (NLP) is then developed to generate the corresponding material-balance constraints. In the final step, a mixed integer linear programming (MILP) model and a mixed integer nonlinear programming (MINLP) model are constructed for stipulating the optimal short-term and cyclic schedules respectively. The conventional concept of event points is adopted to facilitate the continuous-time representation in these model formulations. The implementation procedure is illustrated with two example systems in this paper. Satisfactory process configurations and production schedules can both be produced in all the cases we have studied so far. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100101w

Two-tier search strategy to identify nominal operating conditions for maximum flexibility / Vincentius Surya Kurnia Adi in Industrial & engineering chemistry research, Vol. 50 N° 18 (Septembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 18 (Septembre 2011) . - pp. 10707-10716 Titre : Two-tier search strategy to identify nominal operating conditions for maximum flexibility Type de document : texte imprimé Auteurs : Vincentius Surya Kurnia Adi, Auteur ; Chuei-Tin Chang, Auteur Année de publication : 2011 Article en page(s) : pp. 10707-10716 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Flexibility  Operating  conditions Résumé : Traditionally, design and control issues have been addressed separately at different stages in the life cycle of a chemical plant. The process parameters are often selected in an ad hoc fashion during the design stage, and some of them later become the nominal set-point conditions in actual plant operation. The uncertain online disturbances associated with each set of operating conditions usually vary within a specific range centered at the nominal value. Because these arbitrarily chosen parameter values do not always result in the highest level of operational flexibility, it is thus desirable to develop a systematic method to optimally stipulate the nominal operating conditions of an existing process for maximum flexibility. The well-recognized flexibility index model is used in this work to evaluate system resiliency based on fixed nominal conditions, and a direct search method (differential evolution) is performed accordingly to identify the best candidates. Two examples are presented in this article to demonstrate the impacts of nominal settings and the effectiveness of the proposed optimization approach. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24523888 [article] Two-tier search strategy to identify nominal operating conditions for maximum flexibility [texte imprimé] / Vincentius Surya Kurnia Adi, Auteur ; Chuei-Tin Chang, Auteur . - 2011 . - pp. 10707-10716. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 18 (Septembre 2011) . - pp. 10707-10716 Mots-clés : Flexibility  Operating  conditions Résumé : Traditionally, design and control issues have been addressed separately at different stages in the life cycle of a chemical plant. The process parameters are often selected in an ad hoc fashion during the design stage, and some of them later become the nominal set-point conditions in actual plant operation. The uncertain online disturbances associated with each set of operating conditions usually vary within a specific range centered at the nominal value. Because these arbitrarily chosen parameter values do not always result in the highest level of operational flexibility, it is thus desirable to develop a systematic method to optimally stipulate the nominal operating conditions of an existing process for maximum flexibility. The well-recognized flexibility index model is used in this work to evaluate system resiliency based on fixed nominal conditions, and a direct search method (differential evolution) is performed accordingly to identify the best candidates. Two examples are presented in this article to demonstrate the impacts of nominal settings and the effectiveness of the proposed optimization approach. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24523888