Patent ID: 7943015

Claim:
A process for increasing the fluorine content of CF 3 CH 2 CHF 2 , comprising: (a) photochlorinating CF 3 CH 2 CHF 2 in a reactor in which light from a light source is directed through a wall of said reactor to interact with CF 3 CH 2 CHF 2 and chlorine in said reactor to produce CF 3 CH 2 CClF 2 ; and (b) reacting CF 3 CH 2 CClF 2 produced by the photochlorination in (a) with HF to produce CF 3 CH 2 CF 3 ; wherein the light directed through the reactor wall in (a) is directed through a copolymer of a perfluoro(alkyl vinyl ether); and CF 3 CH 2 CHF 2 and chlorine is reacted in the presence of light directed through said copolymer.