Modeling and optimization of chemical processes: ascend IV and stochastic optimizers

Authors:
Helder G. Silva;Romualdo L. R. Salcedo
Affiliations:
FEUP, Departamento de Engenharia Química, Universidade do Porto, Porto, Portugal;FEUP, Departamento de Engenharia Química, Universidade do Porto, Porto, Portugal
Venue:
MS'06 Proceedings of the 17th IASTED international conference on Modelling and simulation
Year:
2006

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Abstract

A coupled strategy for the solution of non linear programming problems (NLP) is presented. ASCEND IV, an equation oriented environment for simulation, was coupled with MSIMPSA and MSGA, both stochastic optimizers developed for global optimization.This paper shows the main features of the strategy built and the parameters related with its configuration. The procedures presented were applied to the solution of the optimization of a reactive distillation column for the production of ethylene glycol.Several runs were performed considering different numbers of trays and the results verified are comparable to previous ones, obtained using MSIMPSA and MSGA coupled with FORTRAN 77 written simulations. However, when the column size (number of stages) increases, the results deteriorate.