Antimony pentachloride recovery from catalyst solns. - by heating with perchloroethylene, sepg. pptd. antimony trichloride and converting to pentachloride

摘要

In the parent patent antimony pentachloride is recovered from catalysts solns. used for the fluorination of chlorine derivatives of methane or ethane by (a) heating the catalyst soln. with trichloroethylene at 100-170 degrees C, until all of the Sb is converted into SbCl3, (b) separating the SbCl3 from the organic soln., and (c) converting the SbCl3 into SbCl5. In this addition the trichloroethylene is replaced by perchloroethylene. Reaction can be effected in non-pressurised systems at 100 degrees to b.p. of perchloroethylene (121-2 degrees C). Hexachloroethane is formed as by-prod. This cpd. is useful as an intermediate for the prepn. of chlorofluorohydrocarbons by reacting with hydrogen fluoride.