Process for preparing 1,1,1,2-tetrafluoroethane

Details Process for preparing 1,1,1,2-tetrafluoroethane Process for preparing 1,1,1,2-tetrafluoroethane

C - Chemistry, Metallurgy

07

C

260/658.2

C07C 17/08 (2006.01) B01J 27/125 (2006.01) C07C 17/20 (2006.01) C07C 17/21 (2006.01) C07C 19/08 (2006.01)

Patent

CA 2020853

1,1,1,2-tetrafluoroethane (134a) is prepared by reacting, in the gas phase, trichloroethylene with 1,1,1-trifluorochloroethane (133a) and hydrofluoric acid with trichloroethylene/133a molar ratios ranging from 5/95 to 50/50, in the presence of a catalyst consisting of Cr2O3 carried on AlF3. The process provides 134a yields higher than 90% and permits an exceptionally long life of the catalyst. In this way it is possible to realize a continuous process by recycling the unreacted trichloroethylene and 133a, thereby making up for the relatively low global conversion of the reagents.

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