1. Postgraduate in Chemical Engineering, Federal University of Rio Grande do Norte, 59072-970 Natal, Rio Grande do Norte, Brazil
2. Postgraduate in Petroleum Engineering, Federal University of Rio Grande do Norte, 59072-970 Natal, Rio Grande do Norte, Brazil
3. Department of Petroleum Engineering, Federal University of Rio Grande do Norte, 59072-970 Natal, Rio Grande do Norte, Brazil
4. Department of Chemical Engineering, Federal University of Maranhão, 65080-420 São Luís, Maranhão, Brazil
5. Petrobras/CENPES, Av. Horácio Macedo, 950─C. Universitária─Ilha do Fundão, CEP: 21941-915 Rio de Janeiro, Rio de Janeiro, Brazil