ApplicationNo. 337128 filed on 11/10/1994
US Classes:570/166, Metal halide containing catalyst570/169Metal oxide containing catalyst
ExaminersPrimary: Siegel, Alan
Attorney, Agent or Firm
Foreign Patent References
International ClassC07C 017/08
Foreign Application Priority Data1989-07-12 IT
Abstract1,1,1,2-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 Cr2 O3 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.