FIELD: chemistry industry. SUBSTANCE: described is method of preparing 1,1- difluoroethane by reacting hydrogen fluoride with vinyl chloride in liquid phase in the presence of hydrofluorination catalyst. Reaction is carried out reaction mixture containing at least one compound selected from perchloroethylene and 1,1,1,3,3- pentafluorobutane. Catalyst is selected from derivatives of metals of groups IIIa, IVa, Ivb, Va, Vb and V1b of Periodic Table and deactivation of catalyst is thus avoided. EFFECT: more efficient preparation method. 10 cl, 4 ex, 1 tbl
