1,2,3,3,3-Pentafluoropropene production processes
View Patent ↗A process is disclosed for making CF 3 CF═CHF. The process involves reacting CF 3 CClFCCl 2 F with H 2 in a reaction zone in the presence of a catalyst to produce a product mixture comprising CF 3 CF═CHF. The catalyst has a catalytically effective amount of palladium supported on a support selected from the group consisting of alumina, fluorided alumina, aluminum fluoride and mixtures thereof and the mole ratio of H 2 to CF 3 CClFCCl 2 F fed to the reaction zone is between about 1:1 and about 5:1. Also disclosed are azeotropic compositions of CF 3 CClFCCl 2 F and HF and azeotropic composition of CF 3 CHFCH 2 F and HF.
1. A process for making 1,2,3,3,3-pentafluoropropene, comprising:
reacting CF 3 CClFCCl 2 F with H 2 in a reaction zone in the presence of a catalyst comprising a catalytically effective amount of palladium supported on a support selected from the group consisting of alumina, fluorided alumina, aluminum fluoride and mixtures thereof, to produce a product mixture comprising 1,2,3,3,3-pentafluoropropene, wherein the mole ratio of H 2 to CF 3 CClFCCl 2 F fed to the reaction zone is between about 1:1 and about 5:1.
2. The process of claim 1 wherein said 1,2,3,3,3-pentafluoropropene is recovered from the product mixture.
3. The process of claim 1 wherein 2,3,3,3-tetrafluoro-1-propene is also present in the product mixture; and wherein said 2,3,3,3-tetrafluoro-1-propene is also recovered.
4. The process of claim 1 wherein 1,1,1,2,3-pentafluoropropane is also present in the product mixture; and wherein said 1,1,1,2,3-pentafluoropane is also recovered.
5. The process of claim 1 wherein 1-chloro-1,2,3,3,3-pentafluoropropene is also present in the product mixture; and wherein said 1-chloro-1,2,3,3,3-pentafluoropropene is also recovered.
6. The process of claim 1 wherein HF is also fed to the reaction zone.
7. The process of claim 6 wherein 1-chloro-1,1,2,3,3,3-hexafluoropropane is also present in the product mixture; and wherein 1-chloro-1,1,2,3,3,3-hexafluoropropane is recovered from the product mixture.
8. The process of claim 6 wherein said HF is fed to the reaction zone as an azeotrope or near azeotrope comprising HF and CF 3 CClFCCl 2 F.
9. The process of claim 6 wherein 1,1,1,2,3-pentafluoropropane is also present in the product mixture; and wherein said 1,1,1,2,3-pentafluoropropane is also recovered from the product mixture.
10. A process for making 1,1,1,2,3-pentafluoropropane, comprising:
(1) recovering 1-chloro-1,2,3,3,3-pentafluoropropene in accordance with claim 5 ; and
(2) hydrogenating said 1-chloro-1,2,3,3,3-pentafluoropropene to 1,1,1,2,3-pentafluoropropane.
11. A process for making 1,1,1,2,3-pentafluoropropane, comprising:
(1) recovering 1,2,3,3,3-pentafluoropropene in accordance with claim 2 ; and
(2) hydrogenating said 1,2,3,3,3-pentafluoropropene, optionally in the presence of HF, to 1,1,1,2,3-pentafluoropropane.
12. A process for making 1,1,1,2,3,3-hexafluoropropane comprising:
(1) recovering 1-chloro-1,1,2,3,3,3-hexafluoropropane in accordance with claim 7 ; and
(2) hydrogenating said 1-chloro-1,1,2,3,3,3-hexafluoropropane to 1,1,1,2,3,3-hexafluoropropane.