1. Chair of Process Dynamics and
Operation, Technische Universität Berlin, Sekr. KWT 9, Strasse des 17. Juni 135, D-10623 Berlin, Germany
2. ECOPETROL S.A., Km 7, VíaPiedecuesta, A.A. 4185 Santander, Colombia
3. School of Engineering, Design & Technology, University of Bradford, BD7 1DP, U.K.