1. School of Mechanical Engineering; Korea University; Seoul 136-713 Korea
2. Plant and Environmental Research Team; Daewoo Institute of Construction Technology; Suwon Kyungki-do 440-210 Korea
3. Process Engineering Team; Daewoo Engineering and Construction; Seoul 110-713 Korea
4. Petrochemical Research Chair, Department of Chemistry, College of Science; King Saud University; Riyadh 11451 Saudi Arabia
5. Department of Mechanical and Industrial Engineering; University of Illinois at Chicago; 842 W. Taylor St. Chicago 60607 IL USA