1. Department of Chemical and Environmental Process Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3, HU 1111 Budapest , Hungary
2. Institute of Chemistry, University of Miskolc, Egyetemváros C/1 108, HU 3515 Miskolc, Hungary
3. Chemical Engineering Department, National Research Centre, El Buhouth Street 33, EG 12622 Cairo, Egypt