Patent ID: 8309774

Claim:
A composition comprising 2,3,3,3-tetrafluoropropene (1234yf), 1,1,1,2,2-pentafluoropropane (245cb), and 1,1,1,2-tetrafluoro-2-chloropropane (244bb), wherein: the molar ratio of 245cb to 244bb ranges from 1:1 to 70:1, the molar ratio of 1234yf to 245cb ranges from 1:5 to 3:1, and the 1234yf and the 245cb form an equilibrium; further wherein said composition is obtainable by a method comprising: (i) contacting 1,1,2,3-tetrachloropropene (1230xa) with hydrogen fluoride HF in a gas phase in the presence of a fluorination catalyst under conditions effective to produce a reaction mixture comprising 245cb, and (ii) recycling the 245cb formed to step (i).