Patent ID: 7250540
Filing Date: 2007-07-31
Classification: C07C,C25B

Abstract:
1. A process comprising: (a) perfluorinating a starting material comprising a linear or branched hydrocarbon compound, a partially fluorinated linear or branched hydrocarbon compound, or a mixture thereof by electrochemical fluorination (ECF) in an electrochemical cell (ECF cell) in a solution of anhydrous liquid hydrogen fluoride under temperature and pressure conditions sufficient to replace all hydrogens in at least part of the starting material with fluorine, to yield an ECF effluent wherein said ECF effluent comprises an off-gas and other ECF effluent constituents wherein the other ECF effluent constituents comprise perfluorinated and non-perfluorinated material; (b) separating the off-gas from the other ECF effluent constituents; (c) separating the other ECF effluent constituents to yield a perfluorinated feed material separated from the non-perfluorinated material; (d) pyrolyzing the perfluorinated feed material to yield a reaction mixture; (e) quenching the reaction mixture to yield a product mixture; and (f) recovering tetrafluoroethylene and/or hexafluoropropylene from said product mixture.