Avaliação do comportamento dinâmico de uma coluna de destilação azeotrópica de alta pureza.

Abstract

Distillation columns represent challenging problems of control, so that the design of their systems of control is not a trivial task. In this sense, knowledge of the dynamic behavior becomes essential in the development and/or improvement of the control system. The objective of this study is to evaluate the dynamic behavior of a high purity azeotropic distillation column, the performance of current control system is far below the desired. The column is located in a commercial plant for production of vinyl chloride (MVC or C2H3Cl). The study was conducted using the commercial simulator AspenTM. The thermodynamic model used, NRTL, was efficient in the representation of the equilibrium liquid-liquid-vapor. From a balance between the phases showed that along the column there is a reversal in the behavior of the main components that are present in the system. The results also showed the great influence of the flow stream of HCU on the current composition of the base, so it is advisable to keep this variable constant at a level where, within the possible.