Process for dehydrofluorination of 3-chloro-1,1,1,3-tetrafluoropropane to 1-chloro-3,3,3-trifluoropropene
View Patent ↗A process for making 1-chloro-3,3,3-trifluoropropene. The process has the following step: dehydrofluorinating 3-chloro-1,1,1,3-tetrafluoropropane under conditions sufficient to effect dehydrofluorination in the presence of a catalyst. Preferred catalysts are selected from the group consisting of (i) one or more halogenated trivalent or higher valent metal oxides, (ii) one or more trivalent or higher valent metal halides, and (iii) one or more natural or synthetic graphite materials.
1. A process for making 1-chloro-3,3,3-trifluoropropene, comprising: dehydrofluorinating 3-chloro-1,1,1,3-tetrafluoropropane under conditions sufficient to effect dehydrofluorination in the presence of a catalyst.
2. The process of claim 1 , wherein the catalyst is selected from the group consisting of (i) one or more halogenated trivalent or higher valent metal oxides, (ii) one or more trivalent or higher valent metal halides, (iii) one or more natural or synthetic graphites, and (iv) combinations thereof.
3. The process of claim 1 , wherein the dehydrofluorinating is carried out in the vapor phase.
4. The process of claim 2 , wherein the dehydrofluorinating is carried out in the vapor phase.
5. The process of claim 2 , wherein the catalyst is the one or more halogenated trivalent or higher valent metal oxides.
6. The process of claim 5 , wherein the metal ion of the catalyst is selected from the group consisting of Al 3+ , Ga 3+ , In 3+ , Sc 3+ , Y 3+ , La 3+ , Cr 3+ , Fe 3+ , Co 3+ , Ti 4+ , Zr 4+ , Ce 4+ , Sn 4+ , Mn 4+ , Nb 5+ , W 6+ , and combinations thereof.
7. The process of claim 2 , wherein the catalyst is the one or more trivalent or higher valent metal halides.
8. The process of claim 7 , wherein the metal ion(s) is selected from the group consisting of Al 3+ , Ga 3+ , In 3+ , Sc 3+ , Y 3+ , La 3+ , Cr 3+ , Fe 3+ , Co 3+ , Ti 4+ , Zr 4+ , Ce 4+ , Sn 4+ , Mn 4+ , Nb 5+ , and W 6+ , and combinations thereof.
9. The process of claim 2 , wherein the catalyst is the one or more natural or synthetic graphites.
10. The process of claim 1 , wherein the dehydrofluorinating is carried out is carried out at a temperature from about 100° C. to about 600° C.
11. The process of claim 2 , wherein the dehydrofluorinating is carried out is carried out at a temperature from about 100° C. to about 600° C.
12. The process of claim 1 , wherein the dehydrofluorinating is carried out is carried out at a pressure from about 1 atm to about 20 atm.
13. The process of claim 2 , wherein the dehydrofluorinating is carried out is carried out at a pressure from about 1 atm to about 20 atm.
14. The process of claim 1 , wherein the dehydrofluorinating is carried out is carried out for a residence time from about 0.5 second to about 600 seconds.
15. The process of claim 2 , wherein the dehydrofluorinating is carried out is carried out for a residence time from about 0.5 second to about 600 seconds.
16. The process of claim 1 , wherein the catalyst is supported.
17. The process of claim 1 , wherein the catalyst is unsupported.
18. The process of claim 1 , wherein the dehydrofluorination yields a reaction product having the 1-chloro-3,3,3-trifluoropropene and one or more compounds other than 1-chloro-3,3,3-trifluoropropene.
19. The process of claim 18 , wherein the dehydrofluorination is followed by a separation of 1-chloro-3,3,3-trifluoropropene from the reaction product.
20. The process of claim 19 , wherein the dehydrofluorination is followed by a separation of either the trans isomer or the cis isomer of 1-chloro-3,3,3-trifluoropropene from the reaction product.