Method for isomerizing 1,1,2-trifluoro-1,2-dichloroethane to 1,1,1-trifluoro-2,2-dichloroethane

摘要

1,1,2-trifluoro-1,2-dichloroethane (A123a) was contacted with AlF ₃ at a temperature ranging from 180 ° C to 400 ° C to 1,1,2-trifluoro-1,2-dichloroethane (A123a) isomerizes with 1,1,1-trifluoro-2,2-dichloroethane (A123). This is preferably done as a mixture of A123a with A123 and / or other chlorofluorocarbons from the preparation of A123 by fluorinated hydrogenation of perchloroethylene.