Method for producing fluorinated organic compounds
View Patent ↗Disclosed is a method for producing fluorinated organic compounds, including hydrofluoropropenes, which preferably comprises converting at least one compound of formula (I): CF 3 CF n CH m X a-m (I) to at least one compound of formula (II) CF 3 CZCHZ (II). where each X is independently Cl, I or Br; each Z is independently H or F; n is 1 or 2; m is 1, 2 or 3, provided that when n is 1, m is 1 or 2; a is 2 or 3, and a-m≧0. Certain embodiments include the step of reacting fluorinated C2 olefin, such as tetrafluoroethylene, with a C1 addition agent under conditions effective to produce a compound of formula (I).
1. A method of preparing fluorinated organic compounds comprising converting a compound having a first formula
CF 3 CH 2 CHFCl
to a compound having a second formula
CF 3 CH═CHF
wherein said converting involves a vapor phase contacting of said compound of the first formula with at least one neutral charge metal catalyst; and
wherein the neutral charge metal catalyst is selected from the group consisting of Ni 0 , Pd 0 , Fe 0 catalysts, and combinations of two or more of these.
2. The method of claim 1 wherein said converting step is carried out under conditions effective to provide a conversion of at least one compound according to the first formula of at least about 40%.
3. The method of claim 1 wherein said converting step is carried out under conditions effective to provide a conversion of at least one compound according to the first formula of at least about 80%.
4. The method of claim 1 wherein said converting step is carried out under conditions effective to provide a conversion of at least one compound according to the first formula of at least about 90%.
5. The method of claim 1 wherein said converting step is carried out under conditions effective to provide a selectivity to at least one compound according to the second formula of at least about 95%.
6. The method of claim 1 wherein said converting step is carried out under conditions effective to provide a selectivity to at least one compound according to the second formula of at least about 90%.
7. A method of preparing fluorinated organic compounds comprising the dehydrochlorination of a compound of formula (I)
CF 3 [C(R 1 a R 2 b )] n C(R 3 c R 4 d ) (I)
to at least one compound of formula (II)
CF 3 [C(R 1 a R 2 b )] n-1 CZ═CHZ (II)
where
R, R 2 , R 3 and R 4 are each independently a hydrogen atom or a halogen selected from the group consisting of fluorine, chlorine, bromine and iodine, provided that at least one R 1 , R 2 , R 3 and R 4 is chlorine and the compound has hydrogen on the last two carbons;
a and b are independently equal to 0, 1 or 2, provided that (a+b)=2;
c and d are independently equal to 0, 1, 2 or 3, provided that (c+d)=3;
n is 1, 2, 3 or 4, and
each Z is independently H or a halogen, further provided that the Z on the terminal carbon is a halogen;
wherein said converting step comprises catalytically converting the compound of formula (I) to one or more compounds of formula (II) by exposing the compound of formula (I) to a neutral charge metal catalyst; and
wherein the neutral charge metal catalyst is selected from the group consisting of Ni 0 , Pd 0 , Fe 0 catalysts, and combinations of two or more of these.
8. The method of claim 7 wherein said converting step is carried out under conditions effective to provide a conversion of at least one compound according to formula (I) of at least about 40%.
9. The method of claim 7 wherein said converting step is carried out under conditions effective to provide a conversion of at least one compound according to formula (I) of at least about 80%.
10. The method of claim 7 wherein said converting step is carried out under conditions effective to provide a conversion of at least one compound according to formula (I) of at least about 90%.
11. The method of claim 7 wherein said converting step is carried out under conditions effective to provide a formula (II) selectivity of at least about 95%.
12. The method of claim 7 wherein said converting step is carried out under conditions effective to provide selectivity to at least one compound according to formula (11) of at least about 90%.
13. The method of claim 7 wherein the Z on the terminal carbon is a fluorine.
14. The method of claim 13 wherein n is 1.
15. The method of claim 14 wherein the compound of formula (II) comprises HFO-1234ze.
16. The method of claim 7 wherein the compound of formula (I) is selected from the group consisting of:
dichlorotrifluoropropane (HCFC-243);
chlorotetrafluoropropane (HCFC-244); and
all isomers and combinations of each of these.
17. The method of claim 7 wherein the compound of formula (I) comprises HCFC-244fa.
18. The method of claim 7 wherein the neutral charge metal catalyst comprises a Ni 0 catalyst.
19. The method of claim 18 wherein the neutral charge metal catalyst comprises Ni on carbon.
20. The method of claim 18 wherein the neutral charge metal catalyst comprises Ni on chromium oxide.
21. The method of claim 1 wherein the neutral charge metal catalyst comprises a Ni 0 catalyst.
22. The method of claim 21 wherein the neutral charge metal catalyst comprises Ni on carbon.
23. The method of claim 21 wherein the neutral charge metal catalyst comprises Ni on chromium oxide.