1. Chemical
Engineering Department, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
2. Faculty
of Engineering, University of Jember, Jln. Kalimantan 37, 68121 Jember, Indonesia
3. Chemical
Engineering Department, Bandung Institute of Technology, Jln. Ganesha
10, 40132 Bandung, Indonesia