Documents disponibles écrits par cet auteur

Internal heat integration and controllability of double feed reactive distillation columns, 1. effect of feed tray location / M. V. Pavan Kumar in Industrial & engineering chemistry research, Vol. 47 N°19 (Octobre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°19 (Octobre 2008) . - p. 7294–7303 Titre : Internal heat integration and controllability of double feed reactive distillation columns, 1. effect of feed tray location Type de document : texte imprimé Auteurs : M. V. Pavan Kumar, Auteur ; N. Kaistha, Auteur Année de publication : 2008 Article en page(s) : p. 7294–7303 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Feed  tray  locations  Reactive  distillation  columns  Steady-state  bifurcation  analysis Résumé : The impact of altering feed tray locations (for the purpose of saving energy) on the controllability of double feed reactive distillation (RD) columns is evaluated for two case studies: a hypothetical ideal RD column and a methyl acetate RD column. Energy savings of 18.3% and 36.4% over the conventional design (feed immediately above and below the reactive zone) is achieved for the ideal and methyl acetate systems, respectively. A steady-state bifurcation analysis shows that, for both systems, output multiplicity, with respect to reboiler duty, occurs at a fixed reflux rate for the different designs (conventional/altered feed tray location). The output multiplicity is eliminated at a fixed reflux ratio. Closed-loop dynamic simulation results show that the controllability of the internally heat integrated ideal RD column deteriorates, compared to the conventional design. Unlike the conventional design, temperature-based inferential control is infeasible and composition-based control structures must be used. For the methyl acetate column, on the other hand, heat integration by altering the feed locations entails no loss in controllability using two-point temperature inferential control. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071638n [article] Internal heat integration and controllability of double feed reactive distillation columns, 1. effect of feed tray location [texte imprimé] / M. V. Pavan Kumar, Auteur ; N. Kaistha, Auteur . - 2008 . - p. 7294–7303. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°19 (Octobre 2008) . - p. 7294–7303 Mots-clés : Feed  tray  locations  Reactive  distillation  columns  Steady-state  bifurcation  analysis Résumé : The impact of altering feed tray locations (for the purpose of saving energy) on the controllability of double feed reactive distillation (RD) columns is evaluated for two case studies: a hypothetical ideal RD column and a methyl acetate RD column. Energy savings of 18.3% and 36.4% over the conventional design (feed immediately above and below the reactive zone) is achieved for the ideal and methyl acetate systems, respectively. A steady-state bifurcation analysis shows that, for both systems, output multiplicity, with respect to reboiler duty, occurs at a fixed reflux rate for the different designs (conventional/altered feed tray location). The output multiplicity is eliminated at a fixed reflux ratio. Closed-loop dynamic simulation results show that the controllability of the internally heat integrated ideal RD column deteriorates, compared to the conventional design. Unlike the conventional design, temperature-based inferential control is infeasible and composition-based control structures must be used. For the methyl acetate column, on the other hand, heat integration by altering the feed locations entails no loss in controllability using two-point temperature inferential control. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071638n

Internal heat integration and controllability of double feed reactive distillation columns, 2. effect of catalyst redistribution / M. V. Pavan Kumar in Industrial & engineering chemistry research, Vol. 47 N°19 (Octobre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°19 (Octobre 2008) . - p. 7304–7311 Titre : Internal heat integration and controllability of double feed reactive distillation columns, 2. effect of catalyst redistribution Type de document : texte imprimé Auteurs : M. V. Pavan Kumar, Auteur ; Nitin Kaistha, Auteur Année de publication : 2008 Article en page(s) : p. 7304–7311 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Catalyst  redistribution  Reactive  distillation  column Résumé : The effect of internal heat integration by catalyst redistribution on the controllability of an ideal and a methyl acetate reactive distillation (RD) column is studied. Conventional designs with feeds immediately above and below the reactive section are internally heat integrated by (a) extending the reactive section into the stripping section with catalyst redistribution, followed by (b) altering the feed tray locations. For the ideal RD system, only reactive section extension results in a design with a reboiler energy savings of 7.7%. The design obtained by reactive section extension followed by altered feed tray locations gives greater energy savings of 18.2%. For the methyl acetate system, simple reactive section extension with no change in the feed tray locations gives the most energy-efficient design with an energy savings of 39.7%. A comparison of the closed-loop performance of the two-point temperature control structures for the different designs demonstrates that temperature inferential control can be used to regulate the internally heat-integrated designs of both the ideal and methyl acetate systems. The controllability of the ideal RD column with full internal heat integration (both items (a) and (b) above) is found to be inferior to the conventional design. For the methyl acetate system, the controllability of the internally heat-integrated design is improved, relative to the conventional design. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071639f [article] Internal heat integration and controllability of double feed reactive distillation columns, 2. effect of catalyst redistribution [texte imprimé] / M. V. Pavan Kumar, Auteur ; Nitin Kaistha, Auteur . - 2008 . - p. 7304–7311. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°19 (Octobre 2008) . - p. 7304–7311 Mots-clés : Catalyst  redistribution  Reactive  distillation  column Résumé : The effect of internal heat integration by catalyst redistribution on the controllability of an ideal and a methyl acetate reactive distillation (RD) column is studied. Conventional designs with feeds immediately above and below the reactive section are internally heat integrated by (a) extending the reactive section into the stripping section with catalyst redistribution, followed by (b) altering the feed tray locations. For the ideal RD system, only reactive section extension results in a design with a reboiler energy savings of 7.7%. The design obtained by reactive section extension followed by altered feed tray locations gives greater energy savings of 18.2%. For the methyl acetate system, simple reactive section extension with no change in the feed tray locations gives the most energy-efficient design with an energy savings of 39.7%. A comparison of the closed-loop performance of the two-point temperature control structures for the different designs demonstrates that temperature inferential control can be used to regulate the internally heat-integrated designs of both the ideal and methyl acetate systems. The controllability of the ideal RD column with full internal heat integration (both items (a) and (b) above) is found to be inferior to the conventional design. For the methyl acetate system, the controllability of the internally heat-integrated design is improved, relative to the conventional design. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071639f