1. Group of Integration, Modeling, Simulation, Control and Optimization of Processes (GIMSCOP), Chemical Engineering Department - Federal University of Rio Grande do Sul (UFRGS), Rua Sarmento Leite, 288/24 - CEP: 90050-170 - Porto Alegre - RS, Brazil, and Braskem S.A., III Pólo Petroquímico, Via Oeste, Lote 5 - CEP: 95853-000 - Triunfo RS, Brazil