1. Department of Petroleum Engineering, Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil
2. Department of Chemical Engineering, Federal University of Maranhão, São Luís, Maranhão, Brazil
3. Postgraduate in Chemical Engineering, Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil
4. Petrobras/CENPES, Rio de Janeiro, Rio de Janerio, Brazil