1. School of Chemical & Metallurgical Engineering, University of the Witwatersrand, 1 Jan Smuts Avenue, Braamfontein 2050, Private Bag 3, Johannesburg, South Africa
2. Petroleum
and Natural Gas Processing Department, Petroleum Training Institute, PMB
20, Effurun, Nigeria
3. School of Chemical & Petroleum Engineering, Afe Babalola University, PMB 5454, Ado-Ekiti, Nigeria