| abstract |
Fluorination catalyst to remove unsaturated impurities (particularly 1-chloro-2,2-difluoroethylene and polyfluoroofffen) present in crude 1,1,1,2-tetrafluoroethane (F134a) Gas mixture of F134a, hydrofluoric acid and chlorine with a molar ratio of HF / F134a of 0.05-0.5 and a Cl 2 / F134a of 0.0001-0.1 at a temperature of 100-300 ° C. and atmospheric pressure of 2.5 Mpa in the presence of Treatment in the |