Dinâmica de colunas de destilação com duas fases líquidas.

Abstract

Distillation accounts for the largest percentage of overall energy consumption of a plant and thus is the most targeted processes when it comes to energy consumption. The present work was the search for reducing the energy consumption of a system column purification of 1,2 dichloroethane (EDC), belonging to the plant commercial production of vinyl monochloride (MVC), Braskem S.A. The results obtained during the steady state simulations with the commercial simulator Aspen Plus™ show that the reduction of energy consumption in the reboiler of this column is intrinsically related to the formation of two liquid phases in some plates of the column. From the formal definition of an objective function to minimize the thermal load of the reboiler and the inclusion of the restrictions imposed on the process that allow the evaluation of two operating conditions, with and without two liquid phases, the study quantifies the reduction of energy consumption and presents the dynamics of the process for both the optimized operational conditions. The results indicate that it is possible to maintain the specification of the commodity operating the column with two liquid phases in some plates and that this case presents a faster dynamics.