(748d) Mathematical Modeling and Optimization Of The Bulk Continuous Process For The Production Of High Impact Polystyrene

In this work, the modeling and optimization of an industrial bulk process for the High Impact Polystyrene continuous production is studied. The mathematical model for a generic reactor is based on the model of Estenoz et al. [Aiche J., 44 (2), 427-441, 1998] and it is extended to consider the complex kinetics associated to the use of initiator mixtures and the presence of high temperature reactions. The devolatilization stage considers the polymerization including the kinetics of oligomer formation and crosslinking reactions together with the interfacial mass transfer phenomena. The model allows the prediction of the molecular structure along the process and the melt flow index and swelling index of the final product. Theoretical predictions adequately reproduce the observed evolution of variables. Engineering applications of the plant model includes the optimization of steady state operation using a routine that is based on a Random Search Algorithm (RSA). This is a robust method that provides a relatively good solution in short simulation times.