Patent ID: 7695595
Filing Date: 2010-04-13
Classification: A61K,C07C

Abstract:
1. A process for the production of purified 1,1,1,2-tetrafluoroethane according to which 1,1,1,2-tetrafluoroethane, comprising olefinic impurities, is subjected to at least two distillations, the second distillation being carried out at a pressure greater than that of the first distillation, wherein the pressure in the first distillation is less than 10 bar and the pressure in the second distillation is at least 10 bar, and at least one fraction comprising 1,1,1,2-tetrafluoroethane of pharmaceutical quality containing less than 5 molar ppm of olefinic impurities is recovered at the outlet of the second distillation.