Patent ID: 6919015

Claim:
A process for the manufacture of tetrafluoroethylene and/or hexafluoropropylene comprising: (a) perfluorinating a starting material comprising a linear or branched hydrocarbon compound and/or a partially fluorinated linear or branched hydrocarbon compound 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; (b) separating said off-gas from other ECF effluent constituents; (c) separating said other ECF effluent constituents to yield a perfluorinated feed material; (d) pyrolyzing said perfluorinated feed material to yield a reaction mixture; (e) quenching said reaction mixture to yield a product mixture; (f) separating a perfluorinated gas from said off-gas; (g) introducing the perfluorinated gas into a DC plasma, wherein the DC plasma acts as a carrier gas, to form a recovery mixture; and (h) recovering tetrafluoroethylene, hexafluoropropylene, or mixtures thereof from said product mixture and said recovery mixture.