1. Dept. of Chem. Eng., Universidad Nacional del Sur, Bahía Blanca 8000, Argentina
2. Consultant Engineer, TIP Colombia, Girón 687547, Colombia
3. KeyLogic Systems, Inc., 3168 Collins Ferry Road, Morgantown, West Virginia 26505, United States
4. Centre for Innovation and Technology Colombian Petroleum Institute, ECOPETROL, Piedecuesta 681011, Colombia
5. Dept. of Chem. Eng., Carnegie Mellon University, 5000 Forbes Ave, Pittsburgh, Pennsylvania 15213, United States