Patent ID: 6624337
Filing Date: 2003-09-23
Classification: C07C,C25B

Abstract:
A process for producing a perfluoroolefin of the formula CF(R1f)&boxH;CF2, wherein R1f is selected from the group consisting of F and CF3, comprising:(a) perfluorinating a cyclobutane starting material of the formula wherein R2f is selected from the group consisting of F and CF3 and each R1 is selected from H and CH3, provided that one R1 is H and the other R1 is H when R1f is F and is CH3 when R1f is CF3, by the Simons electrochemical fluorination process in an electrochemical cell in a solution of anhydrous liquid hydrogen fluoride under temperature and pressure conditions sufficient to replace all hydrogens in the cyclobutane starting material with fluorine; and(b) contacting the perfluorinated cyclobutane produced in (a) with carbon or a conductive metal, which is heated by induction heating to a temperature sufficient to crack said perfluorinated cyclobutane.