FIELD: chemical technology, halogen-containing hydrocarbons. SUBSTANCE: reagent 1: tetrachloroethylene. Reagent 2: HF. Reaction conditions: gaseous phase, at 225-250 C, catalyst is Cr2O3 containing 100 100 mln-1 or less potassium made by pyrolysis of (NH4)2Cr2O7 at 570-620 C following by passing of gaseous HF through its. Formation of pentafluoroethane is minimal. Synthesized 1,1,1-trifluorodichloroethane and 1,1,1,2-tetrafluorochloroethane are used as foaming agents, propellents, refrigerants. EFFECT: improved method of synthesis. 4 cl, 7 ex, 1 tbl
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