1. Advanced Separation Technologies Group, Department of Chemical Engineering, Loughborough University, Loughborough LE11 3TU, U.K., GKSS Research Centre Geesthacht GmbH, Institute of Chemistry, Max-Planck-Strasse 1, 21502 Geesthacht, Germany, Shell Global Solutions, Cheshire Innovation Park, P.O. Box 1, Chester CH1 3SH, U.K., and Shell Global Solutions International BV, P.O. Box 38000, 1030 BN Amsterdam, The Netherlands