continuous process for gasphasenherstellung of trichlortrifluoraethan, dichlortetrafluoraethan and monochlorpentafluoraethan

摘要

Method of preparation in the gas phase of trichlorotrifluoroethane, dichlorotetrafluoroethane and monochloropentafluoroethane, in proportions controlled, from chlorine, of hydrofluoric acid and tetrachlorethylene, and in the presence of a catalyst, characterizes by the combination of two top plug of chlorination - fluorination in series, of a fluorination - dismutation in parallel, and a unit of separation allowing the extraction of the products desires, and the recycling of the hydrofluoric acid recovered and of the products fluorinated or insufficiently fluorinated. / p & & p & the method makes it possible, in particular, the obtaining of dichlorotetrafluoroethane containing less than 7 of isomer asymmetric and trichlorotrifluoroethane containing less than 2 of isomer asymmetric.