1. Department
of Chemical Engineering, Universidade Federal do Rio Grande do Norte, 59072-970,
Natal, RN, Brazil
2. Department
of Chemical Engineering, Universidade Estadual de Maringa, 87020-900, Maringa,
PR, Brazil
3. Chemical Engineering Program, Texas A&M University at Qatar, P.O. Box 23874 Doha, Qatar
4. Department of Chemical
Engineering, Universidade Federal do Parana, 81531-980, Curitiba,
PR, Brazil