1. Chemical Engineering Department, Federal University of Bahia − UFBA, Rua Aristides Novis no. 02, Federação, CEP 40210-630, Salvador-BA, Brazil, and BRASKEM − Insumos Básicos, Rua Eteno no. 1361, Pólo Petroquímico, CEP 42810-000, Camaçarí-BA, Brazil