| Titre : | Internal heat integration and controllability of double feed reactive distillation columns, 1. effect of feed tray location (2008) |
| Auteurs : | M. V. Pavan Kumar, Auteur ; N. Kaistha, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Industrial & engineering chemistry research (Vol. 47 N°19, Octobre 2008) |
| Article en page(s) : | p. 7294–7303 |
| Note générale : | Chemical engineering |
| Langues : | Anglais |
| Tags : | 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 |
