Method for producing fluorinated organic compounds
View Patent ↗Disclosed are processes for the production of fluorinated olefins, preferably adapted to commercialization of CF 3 CF═CH 2 (1234yf). Three steps may be used in preferred embodiments in which a feedstock such as CCl 2 ═CClCH 2 Cl is fluorinated to synthesize a compound such as CF 3 CCl═CH 2 . The CF 3 CCl═CH 2 is preferably converted to CF 3 CFClCH 3 (244-isomer) using a SbCl 5 as the catalyst which is then transformed selectively to 1234yf. For the first step, a mixture of Cr 2 O 3 and FeCl 3 /C is preferably used as the catalyst to achieve high selectivity to CF 3 CCl═CH 2 (96%). In the second step, SbCl 5 /C is preferably used as the selective catalyst for transforming 1233xf to 244-isomer, CF 3 CFClCH 3 . The intermediates are preferably isolated and purified by distillation and used in the next step without further purification, preferably to a purity level of greater than about 95%.
1. A method for producing fluorinated organic compounds comprising fluorinating at least a first compound of Formula (I)
C(X) m CCl(Y) n C(X) m (I)
to form at least one compound of Formula (IB):
C(X) 3 CClYC(X) 3 (IB),
and dehydrohalogenating the at least one compound of Formula (IB) to form to at least one compound of Formula (II)
CF 3 CF═CHZ (II)
where each X, Y and Z is independently H, F, Cl, I or Br, and each m is independently 1, 2 or 3, and n is 0 or 1.
2. The method of claim 1 wherein said fluorinating step is an indirect converting step.
3. The method of claim 1 wherein said at least one first compound of Formula (I) comprises a compound wherein n is 0, each X is independently H or Cl, and Z is H.
4. The method of claim 1 wherein said at least one first compound of Formula (I) comprises a compound Formula (IA):
C(X) 2 ═CClC(X) 3 (IA)
wherein X is as identified in claim 1 .
5. The method of claim 4 wherein Z in said compound of Formula (II) is H.
6. The method of claim 4 wherein X is independently H or Cl.
7. The method of claim 1 wherein said at least one first compound of Formula (I) comprises at least one tetrachloropropene.
8. The method of claim 4 wherein said at least one first compound of Formula (IA) comprises at least one tetrachloropropene.
9. The method of claim 1 wherein said at least one first compound of Formula (I) comprises CH 2 ═CClCCl 3 .
10. The method of claim 1 wherein said at least one first compound of Formula (I) comprises CCl 2 ═CClCH 2 Cl.
11. The method of claim 1 wherein said at least one first compound of Formula (I) comprises CHCl═CClCCl 2 H.
12. The method of claim 1 wherein said at least one first compound of Formula (I) is selected from the group consisting of CH 2 ═CClCCl 3 , CCl2=CClCH 2 Cl, CHCl═CClCCl 2 H, and combinations of these.
13. The method of claim 1 wherein said at least one first compound of Formula (I) comprises a compound wherein n is 0 and the terminal saturated carbon has three (3) F substituents.
14. The method of claim 1 wherein said at least one first compound of Formula (I) comprises a compound Formula (IAA):
C(X) 2 ═CClCF 3 (IAA)
wherein X is as identified in claim 1 .
15. The method of claim 14 wherein each X in said compound of Formula (IAA) is independently H or Cl.
16. The method of claim 1 wherein said at least one first compound of Formula (I) comprises at least one trifluoropropene.
17. The method of claim 16 wherein said at least one trifluoropropene comprises CH 2 ═CClCF 3 (HCFO-1233xf).
18. The method of claim 1 wherein each X in said compound of Formula (IB) is independently H, F, or Cl.
19. The method of claim 1 wherein said Formula (IB) compound has at least two halogens on one terminal carbon and at least two hydrogen atoms on the other terminal carbon.
20. The method of claim 1 wherein said at least one compound of Formula (IB) comprises at least one propane having at least four halogens substituents.
21. The method of claim 20 wherein said at least one compound of Formula (IB) comprises at least one propane having at least five halogen substituents.
22. The method of claim 1 wherein Y is F and all three X on one terminal carbon are F in said at least one compound of Formula (IB).
23. The method of claim 1 wherein said at least one compound of Formula (IB) comprises a tetra-fluorinated, mono-chlorinated propane.
24. The method of claim 23 wherein said at least one tetra-fluorinated, mono-chlorinated propane comprises 1,1,1,2-tetrafluoro-2-chloropropane.