1. Department of Chemical Engineering, Clarkson University, Potsdam, New York 13699-5705, Department of Chemical Engineering, Universiteit Twente, Postbus 217, 7500 AE Enschede, The Netherlands, COSMOlogic GmbH & Co. KG, Burscheider Str. 515, 51381 Leverkusen, Germany, and E.I. du Pont de Nemours and Company, DuPont Engineering Technology, 1007 Market Street, Wilmington, Delaware 19808