| abstract |
To remove unsaturated impurities (in particular 1-chloro-2,2-difluoroethylene and polyfluoropropenes) present in 1,1,1,2-tetrafluoroethane (F134a) raw, treated in the gas phase, in the presence of a catalyst fluorination, a gaseous mixture of crude F134a, hydrofluoric acid and chlorine to a temperature between 100 and 300 ° C and under pressure between atmospheric pressure and 2.5 MPa, the HF / F134a molar ratio being understood between 0.05 and 0.5 and the Cl2 / F134a molar ratio between 0.0001 and 0.1. |