Patent ID: 8642818

Claim:
A process for preparing 1,1,1,2-tetrafluoropropene (1234yf) that comprises: fluorination of 1,1,3,3-tetrachlororopropene (1230za) and/or 1,1,1,3,3 pentachloropropane (240fa) to produce 1-chloro-3,3,3-trifluoro-propene (1233zd); isomerization of said 1-chloro-3,3,3-trifluoro-propene (1233zd) to produce 2-chloro-3,3,3-trifluoropropene (1233xf); and fluorination of said 2-chloro-3,3,3-trifluoropropene (1233xf) to produce 1,1,1,2-tetrafluoropronene (1234yf) directly and/or via a coproduct selected from the group consisting of 1,1,1,2,2-pentafluoropropane (245cb) or 2-chloro-1,1,1,2-tetrafluoropropane (244bb).