Destilação de alta pureza para remoção de HCl de monocloreto de vinila: avaliação de estratégias de controle

Abstract

Hydrogen chloride (HCl) is a contaminant of vinyl monochloride (MVC), which can cause loss of quality of the polyvinyl chloride (PVC) resin produced from MVC. Distillation is used to remove HCl identified in very low concentrations of the MVC at the bottom of the high purity column. Due to the difficulty of greater sensitivity to disturbance, the present work proposes and evaluates the performance of three control structures to obtain a residual composition below 1 ppm of HCl. In process modeling, a flooded type of condenser was implemented, which is present in industries, but is rarely discussed in scientific works. For disturbances in flow rate and column feed temperature, the results show that the control structure with the addition of a ratio control for calculating the reflux ratio has better performance, with lower offset and IAE. Furthermore, it is observed that the feed temperature and the steam flow rate provided by the reboiler are the variables with the greatest impact on the removal of HCl from the MVC.