Patent ID: 8013194

Claim:
A method for producing at least one fluorinated olefin comprising: a. hydrogenating a starting material stream comprising at least one alkene according to Formula (I): (CX n Y 3−n )(CR 1 a R 2 b ) z CX═CH m X 2−m (I) by contacting said starting material with a reducing agent to produce an intermediate product stream comprising at least one alkane according to Formula (II): (CX n Y 3−n )(CR 1 a R 2 b ) z CHXCH m+1 X 2−m (II) where: each X is independently Cl, F, I or Br, provided that at least two Xs are F; each Y is independently H, Cl, F, I or Br; each R 1 is independently H, Cl, F, I, Br or unsubstitued or halogen substituted methyl or ethyl radical; each R 2 is independently H, Cl, F, I, Br or unsubstitued or halogen substituted methyl or ethyl radical; n is 1, 2 or 3; a and b are each 0, 1 or 2, provided that a+b =2; m is 0, 1 or 2; and z is 0, 1, 2 or 3; b. optionally, separating said intermediate product stream into a plurality of stream, said plurality of intermediate product streams comprising two or more stream selected from the group consisting of a first stream rich in at least a first alkane according to Formula II, a seconds stream rich in at least a second alkane according to Formula II, and an alkane recycle stream; c. dehydrofluorinating at least a portion of said intermediate process stream from step (a) or said plurality of intermediate process streams of step (b) to produce an alkene product stream comprising 1,1,1,2,3-pentafluoropropene and at least one additional alkene having a lower degree of fluorine substitution compared to the degree of fluorination of the compound of formula (I); d. separating at least a portion of said 1,1,1,2,3-pentafluoropropene from said alkene product stream to produce a recycle stream rich in 1,1,1,2,3-pentafluoropropene and a final product stream rich in said additional alkene; and e. introducing said recycle stream at said step (a), wherein at least a portion of said 1,1,1,2,3-pentafluoropropene is hydrogenated to form a portion of said intermediate product stream.