1. Department of Chemical Engineering; Universiti Teknologi PETRONAS; Bandar Seri Iskandar Perak 32610 Malaysia
2. Department of Chemical Engineering; NFC Institute of Engineering and Fertilizer Research; Faisalabad 38090 Pakistan
3. Department of Petroleum Engineering; Universiti Teknologi PETRONAS; Bandar Seri Iskandar Perak 32610 Malaysia