1. Petroleum-Gas University of Ploieşti Bucharest Blvd. 39 100680 Ploieşti Romania
2. National Institute for Research and Development of Isotopic and Molecular Technologies, 67–103 Donat 400293 Cluj-Napoca Romania
3. Research Institute for Auxiliary Organic Products 8 Carpati Street, No. 8 Medias Romania
4. University Politehnica of Bucharest Department of Chemical and Biochemical Engineering 1-7 Polizu Str. 011061 Bucharest Romania