• Universität Erlangen-Nürnberg (Prof. Dr. W. Arlt)
• Delft University, The Netherlands (Prof. Dr. T. de Loos)
• Warsaw University of Technology, Poland (Prof. Dr. U. Domanska)
• Universität Triest, Italy (Prof. Dr. P. Fermeglia)
• Instituto Politecnico Nacional-Esiqie, Mexico (Dr. Luis A. Galicia-Luna)
• Universität Rostock (Prof. Dr. A. Heintz)
• Universität Graz, Austria (Prof. Dr. H. Huemer)
• Martin Luther Universität Halle-Wittenberg (Prof. Dr. D. A. Lempe)
• Tsinghua University, Beijing, China (Prof. Dr. Jiding Li)
• University of Natal, South Africa (Prof. Dr. T. Letcher)
• University of Canterbury, Christchurch, New Zealand (Prof. K. N. Marsh)
  
• Nihon Universität Tokio, Japan (Prof. Dr. K. Ochi)
  
• Chungnam National Universität, Daejon, South Korea (Prof. Dr. S.-J. Park)
• University of Kwazulu-Natal, South Africa (Prof. Dr. D. Ramjugernath)
• Ecole de Mines, Fontainebleau, France (Prof. Dr. D. Richon)
• University of Delaware, Newark, USA (Prof. Dr. S. Sandler)
• Institute of Chemistry, Tallinn, Estonia (Dr. E. Siimer)
• Nihon Universität Tokio, Japan (Prof. Dr. K. Tochigi)
• China (Prof. Dr. Li-Chen Wang)
• Universität Erlangen-Nürnberg (Prof. Dr. P. Wasserscheid)
• Tschechische Akademie der Wissenschaften, Czech Republic (Prof. Dr. I. Wichterle)
• University, China (Prof. Dr. Weidon Yan Hangzhou)
• Nagasaki University, Japan (Prof. Dr. T. Yamaguchi)

Cooperating Companies (research group Prof. Gmehling)

• DDBST GmbH, Oldenburg
• LTP (Laboratory for Thermophysical Properties), Oldenburg
• FIZ CHEMIE GmbH, Berlin (Dr. R. Deplanque) 
• DECHEMA e.V. Frankfurt (Dr. R. Sass) 

Company Consortium (Further Development of the UNIFAC Method)