1. Department of Chemical Engineering, Faculty of Engineering, Universiti Malaya, 50603 Kuala Lumpur, Malaysia
2. University of Malaya Centre for Ionic Liquids (UMCiL), Universiti Malaya, 50603 Kuala Lumpur, Malaysia
3. Chemical Engineering Department, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia