[1] Univ Fed Rio Grande do Norte, Sch Sci & Technol, Campus Univ, BR-59078970 Natal, RN, Brazil
[2] Dept Chem Engn, Enrique Costa Bldg,Campus Univ S-N, Ciudad Real 13071, Spain
[3] Univ Fed Rio Grande do Norte, Inst Chem, Campus Univ, BR-59078970 Natal, RN, Brazil