1. Department of Chemical Engineering, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, 32610 Perak, Malaysia
2. Department of Chemical Engineering, University of Engineering and Technology, 25120 Peshawar, Pakistan
3. Center of Research in Ionic Liquids (CORIL), Universiti Teknologi PETRONAS, Bandar Seri Iskandar, 32610 Perak, Malaysia
4. Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744, Moto-oka, 819-0395 Fukuoka, Japan