1. Department of Chemical Engineering; Universitas Islam Indonesia; Yogyakarta 55584 Indonesia
2. Department of Chemical Engineering; Universitas Negeri Semarang; Semarang 50229 Indonesia
3. Department of Chemical Engineering; King Saud University; P.O. Box 800 Riyadh Saudi Arabia 11421
4. Department of Chemical Engineering; Universitas Sebelas Maret; Surakarta 57126 Indonesia