| 摘要 |
In certain aspects, the present invention relates to methods for increasing the cost efficiency and safety of the hydrogenation of a fluorinated olefin by controlling the reaction conditions and parameters. In further aspects, the hydrogenation reaction is provided in a two stage reaction wherein the reactant amounts, temperature and other parameters are controlled such that the conversion percentage, selectivity, and reaction parameters are all within commercially acceptable levels. |
| 主权项 |
1. A method for producing at least one fluorinated alkane comprising:
a. providing to a first reactor a liquid phase starting material stream comprising at least one alkene according to Formula (I)
(CXnY3-n)(CR1aR2b)zCX═CHmX2-m (I) and at least one alkane according to Formula (II)
(CXnY3-n)(CR1aR2b)zCHXCHm+1X2-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 R1 is independently H, Cl, F, I, Br or unsubstituted or halogen substituted methyl or ethyl radical; each R2 is independently H, Cl, F, I, Br or unsubstituted 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, wherein a ratio of the alkene of formula I to the alkane of formula II is from about 1:6 to about 1:22, b. hydrogenating the starting material stream to produce an intermediate material stream by contacting said starting material stream with a reducing agent such that from about 35 wt % to about 65 wt % of the alkene of Formula I is converted to the alkane of Formula II and wherein the selectivity to said alkane of Formula II is at least about 80 wt %; c. separating a portion of the intermediate product stream into at least a first intermediate product stream comprising the alkene of formula I and the alkane of formula II and a second intermediate product stream comprising the alkene of formula I and the alkane of formula II, wherein the ratio of the alkene of formula I to the alkane of formula II in said second intermediate product stream is from about 1:8 to about 1:20; d. recycling the first intermediate product stream to step b; and e. hydrogenating the second intermediate product stream in a second reactor to produce a final product stream. |
