PURPOSE: To obtain the subject compound on an industrial scale at a low cost by isomerizing 1,1,2-trichloro-1,2,2-trifluoroethane and reacting the resultant 1,1,1-trichloro-2,2,2-trifluoroethane with HF in the presence of a catalyst.
CONSTITUTION: The objective 2,2-dichloro-1,1,1,2-tetrafluoroethane is produced by isomerizing 1,1,2-trichloro-1,2,2-trifluoroethane into 1,1,1-trichloro-2,2,2- trifluoroethane and reacting the isomerized product with hydrogen fluoride in the presence of a catalyst. The process is extremely excellent from industrial viewpoint because it can effectively decrease the content of 1,2-dichloro-1,1,2,2- tetrafluoroethane which is an isomer extremely difficult to separate. The objective compound is useful as a raw material for 1,1,1,2-tetrafluoroethane which is a refrigerant having moderate stability.
YOSHIKAWA SATORU
MURATA KATSUYOSHI
MISUMI SADAJI
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