Method for producing fluorinated organic compounds
View Patent ↗Disclosed are methods for producing fluorinated organic compounds, including hydrofluoropropenes, which preferably comprises converting at least one compound of formula (I): CF 3 CHXCH 2 X (I) to at least one compound of formula (II) CF 3 CZCHZ (II). where X is independently Cl, Br, I or F, and Z independently is H or F. In certain preferred embodiments, each Z is different.
1. A method of preparing fluorinated organic compounds comprising converting at least one compound of formula (I):
CF 3 CHXCH 2 X (I)
to at least one compound of formula (II):
CF 3 CZCHZ (II)
where X is independently Cl or F, and Z is independently is H or F, wherein at least a portion of said converting step is conducted in the liquid phase and in the presence of an aqueous solution of potassium hydroxide (KOH), and wherein said method further comprises forming said compound of formula (I) by halogen addition comprising contacting a fluorinated C3 olefin with a halogen addition agent under conditions effective to produce a compound of formula (I).
2. The method of claim 1 wherein said halogen addition agent comprises fluorine gas.
3. The method of claim 1 wherein said halogen addition agent comprises ClF.
4. The method of claim 3 wherein said halogen addition step comprises a liquid phase reaction.
5. The method of claim 1 wherein said halogen addition step is carried out at a temperature of from about −90° C. to about 50° C.
6. The method of claim 1 wherein said halogen addition agent comprises fluorine gas and a diluent.
7. The method of claim 1 wherein said fluorinated C3 olefin comprises a compound of formula (III)
CX n Y 3-n CY═CH m Y 2-m (III)
where each X is independently Cl or F, each Y is independently H, Cl or F, n is 1, 2 or 3, and m is 1 or 2.
8. The method of claim 7 wherein said compound of formula (III) comprises a compound of formula (IIIA)
CF 3 CHCH 2 (IIIA).
9. The method of claim 8 wherein said compound of formula I comprises
CF 3 CHFCH 2 F.
10. The method of claim 8 wherein said halogen addition agent is a compound of formula X m Y 2-m where X, Y and m are as described above.
11. The method of claim 8 wherein said halogen addition agent is selected from the group consisting of ClF, Cl 2 , F 2 , HF and combinations of these.
12. The method of claim 10 wherein said halogen addition agent comprises F 2 , said compound of formula (III) comprises 3,3,3-trifluoro-1-propene, and said compound of formula (I) comprises CF 3 CHFCH 2 F.
13. The method of claim 1 wherein said converting step comprises dehydrohalogenation of the compound of formula (I).
14. The method of claim 1 wherein said converting step comprises introducing said compound of formula (I) to a reaction system under conditions effective to convert at least about 50% of said compound of formula (I).
15. The method of claim 1 wherein said converting step comprises introducing said compound of formula (I) to a reaction system under conditions effective to produce a reaction product having at least about 70% selectivity to compound(s) of formula (II).
16. The method of claim 15 wherein said compound(s) of formula (II) include tetrafluoropropene.
17. The method of claim 15 wherein said compound(s) of formula (II) include HFO-1234yf.
18. The method of claim 15 wherein said compound of formula (I) is 1,1,1,2,3 pentafluoropropane.
19. The method of claim 18 wherein said compound of formula (II) comprises HFO-1234yf.
20. The method of claim 19 wherein said converting step is carried out under conditions effective to convert at least about 80% of said 1,1,1,2,3 pentafluoropropane and to provide a selectivity to HFO-1234yf of at least about 90%.
21. The method of claim 15 wherein said compound of formula (I) comprises 1,1,1,3-tetrafluoro-2-chloropropane and said compound of formula (II) comprises HFO-1234ze.
22. The method of claim 21 wherein said converting step is carried out under conditions effective to convert at least about 50% of said 1,1,1,3-tetrafluoro-2-chloropropane and to provide a selectivity to HFO-1234ze of at least about 70%.
23. A method of preparing fluorinated organic compounds comprising converting at least one compound of formula (I):
CF 3 CHXCH 2 X (I)
to at least one compound of formula (II):
CF 3 CZCHZ (II)
where X is independently Cl or F, and Z is independently is H or F, wherein said method further comprises forming said compound of formula (I) by halogen addition comprising contacting a fluorinated C3 olefin with a halogen addition agent comprising F 2 wherein at least a portion of said contacting step is conducted in the gas phase under conditions effective to produce a compound of formula (I).
24. A method of preparing fluorinated organic compounds comprising converting at least one compound of formula (I):
CF 3 CHXCH 2 X (I)
to at least one compound of formula (II):
CF 3 CZCHZ (II)
where X is independently Cl or F, and Z is independently is H or F, and wherein said at least one compound of formula II comprises HFO-1234ze, wherein at least a portion of said converting step is conducted in the liquid phase, and wherein said method further comprises forming said compound of formula (I) by halogen addition comprising contact a fluorinated C3 olefin with a halogen addition agent under conditions effective to produce a compound of formula (I).