Patent ID: 7678949

Claim:
A process for the manufacture of at least one compound selected from the group consisting of 1,3,3,3-tetrafluoropropene and 2,3,3,3-tetrafluoropropene, comprising: (a) reacting hydrogen fluoride, chlorine, and at least one halopropene of the formula CX 3 CCl═CClX, wherein each X is independently selected from the group consisting of F and Cl, to produce a product comprising CF 3 CCl 2 CClF 2 and CF 3 CClFCCl 2 F, wherein said CF 3 CCl 2 CClF 2 and CF 3 CClFCCl 2 F are produced in the presence of a chlorofluorination catalyst comprising at least one chromium-containing component selected from (i) a crystalline alpha-chromium oxide where at least 0.05 atom % of the chromium atoms in the alpha-chromium oxide lattice are replaced by divalent copper, and (ii) a chromium-containing composition of (i) which has been treated with a fluorinating agent; (b) reacting CF 3 CCl 2 CClF 2 and CF 3 CClFCCl 2 F produced in (a) with hydrogen to produce a product comprising CF 3 CH 2 CHF 2 and CF 3 CHFCH 2 F; (c) dehydrofluorinating CF 3 CH 2 CHF 2 and CF 3 CHFCH 2 F produced in (b) to produce a product comprising CF 3 CH═CHF and CF 3 CF═CH 2 ; and (d) recovering at least one compound selected from the group consisting of CF 3 CH═CHF and CF 3 CF═CH 2 from the product produced in (c).