Process for the reduction of RfCCX impurities in fluoroolefins
The present disclosure relates to processes for reducing the concentration of R f C≡CX impurities in fluoroolefins. The process involves: contacting a mixture comprising at least one fluoroolefin and at least one R f C≡CX impurity with at least one amine to reduce the concentration of the at least one R f C≡CX impurity in the mixture; wherein R f is a perfluorinated alkyl group, and X is H, F, Cl, Br or I. The present disclosure also relates to processes for making at least one hydrotetrafluoropropene product selected from the group consisting of CF 3 CF═CH 2 , CF 3 CH═CHF, and mixtures thereof and reducing the concentration of CF 3 C═CH impurity generated during the process. The present disclosure also relates to processes for making at least one hydrochlorotrifluoropropene product selected from the group consisting of CF 3 CCl═CH 2 , CF 3 CH═CHCl, and mixtures thereof and reducing the concentration of CF 3 C≡CH impurity generated during the process.
1. A process comprising: contacting a mixture comprising at least one fluoroolefin and at least one R f C≡CX impurity with at least one amine to reduce the concentration of said at least one R f C≡CX impurity in said mixture; wherein R f is a perfluorinated alkyl group, and X is H, F, Cl, Br or I.
2. The process of claim 1 wherein the amount of said at least one fluoroolefin in said mixture is at least 90 wt % based on the total weight of said mixture.
3. The process of claim 1 wherein said at least one fluoroolefin is selected from the group consisting of CF 3 CF═CH 2 , CF 3 CH═CHF, CF 3 CH═CH 2 , CF 3 CCl═CH 2 , CF 3 CH═CHCl, CF 3 CH═CFCl, CF 3 CH═CF 2 , CF 3 CCl═CHF, CF 3 CF═CHF, CF 3 CF═CHCl, CF 3 CH═CCl 2 , CF 3 CCl═CHCl, and mixtures thereof, and wherein said at least one R f C≡CX impurity is selected from the group consisting of CF 3 C≡CH, CF 3 C≡CCl, CF 3 C≡CF, and mixtures thereof.
4. The process of claim 1 wherein said at least one fluoroolefin is selected from the group consisting of CF 3 CF═CH 2 , CF 3 CH═CHF, CF 3 CH═CH 2 , CF 3 CCl═CH 2 , CF 3 CH═CHCl, CF 3 CF═CHCl, and mixtures thereof, and wherein said at least one R f C≡CX impurity is selected from the group consisting of CF 3 C≡CH, CF 3 C≡CCl, CF 3 C≡CF, and mixtures thereof.
5. The process of claim 1 wherein said at least one fluoroolefin is selected from the group consisting of CF 3 CF═CH 2 , CF 3 CH═CHF, CF 3 CCl═CH 2 , CF 3 CH═CHCl, and mixtures thereof, and wherein said at least one R f C≡CX impurity is selected from the group consisting of CF 3 C≡CH, CF 3 C≡CCl, and mixtures thereof.
6. The process of claim 1 wherein said at least one fluoroolefin is CF 3 CF═CH 2 , and wherein said at least one R f C≡CX impurity is selected from the group consisting of CF 3 C≡CH, CF 3 C≡CCl, and mixtures thereof.
7. The process of claim 1 wherein said at least one fluoroolefin is CF 3 CF═CH 2 , and wherein said at least one R f C≡CX impurity is CF 3 C≡CH.
8. The process of claim 1 wherein said at least one fluoroolefin is CF 3 CH═CHF, and wherein said at least one R f C≡CX impurity is CF 3 C≡CH.
9. The process of claim 1 wherein said at least one fluoroolefin is a mixture of CF 3 CF═CH 2 and CF 3 CH═CHF, and wherein said at least one R f C≡CX impurity is CF 3 C≡CH.
10. The process of claim 1 wherein said at least one fluoroolefin is CF 3 CH═CHCl, and wherein said at least one R f C≡CX impurity is CF 3 C≡CH.
11. The process of claim 1 wherein said at least one amine is selected from the group consisting of amine of the formula R 3 N, heterocyclic amines, hydrazine and its derivatives, and mixtures thereof, wherein each R is independently a hydrogen, an alkyl group, a heteroalkyl group, an aryl group, or an aralkyl group.
12. The process of claim 1 wherein said at least one amine is selected from the group consisting of amine of the formula R 3 N, heterocyclic amines, and mixtures thereof, wherein each R is independently a hydrogen, an alkyl group, a heteroalkyl group, or an aralkyl group.
13. The process of claim 12 wherein said at least one amine is a polyamine.
14. The process of claim 12 wherein said at least one amine is a heterocyclic amine.
15. The process of claim 1 wherein said at least one amine is in a solution with a suitable solvent during said contacting step.
16. The process of claim 1 wherein the temperature during said contacting step is from about 0° C. to about 60° C.
17. The process of claim 1 wherein the concentration of said at least one R f C≡CX impurity in said mixture is reduced to 200 ppm or less.
18. The process of claim 1 wherein the concentration of said at least one R f C≡CX impurity in said mixture is reduced to 50 ppm or less.
19. The process of claim 1 wherein the concentration of said at least one R f C≡CX impurity in said mixture is reduced to 2 ppm or less.
20. The process of claim 1 further comprising recovering said at least one fluoroolefin having reduced concentration of said at least one R f C≡CX impurity.
21. A process for making at least one hydrotetrafluoropropene product selected from the group consisting of CF 3 CF═CH 2 , CF 3 CH═CHF, and mixtures thereof, comprising:
(a) dehydrohalogenating at least one starting material selected from the group consisting of CF 3 CFClCH 3 , CF 3 CHFCH 2 Cl, CF 3 CHClCH 2 F, CF 3 CH 2 CHFCl, CF 3 CHFCH 2 F, CF 3 CH 2 CF 2 H, CF 3 CF 2 CH 3 , and mixtures thereof to produce a product mixture comprising CF 3 C≡CH impurity and said at least one hydrotetrafluoropropene product;
(b) contacting said product mixture with at least one amine to reduce the concentration of said CF 3 C≡CH impurity in said product mixture; and
(c) recovering said at least one hydrotetrafluoropropene product having reduced concentration of said CF 3 C≡CH impurity.
22. The process of claim 21 wherein said at least one hydrotetrafluoropropene product is CF 3 CF═CH 2 , and said at least one starting material is selected from the group consisting of CF 3 CFClCH 3 , CF 3 CHFCH 2 Cl, CF 3 CHFCH 2 F, CF 3 CF 2 CH 3 , and mixtures thereof.
23. The process of claim 22 wherein said at least one starting material is CF 3 CFClCH 3 .
24. The process of claim 22 wherein said at least one starting material is CF 3 CHFCH 2 F.
25. The process of claim 21 wherein said at least one hydrotetrafluoropropene product is CF 3 CH═CHF, and said at least one starting material is selected from the group consisting of CF 3 CH 2 CHF 2 , CF 3 CH 2 CHFCl, CF 3 CHClCH 2 F, and mixtures thereof.
26. The process of claim 21 , wherein the concentration of said CF 3 C≡CH impurity in said product mixture is reduced to 200 ppm or less in the contacting step (b).
27. A process for making at least one hydrochlorotrifluoropropene product selected from the group consisting of CF 3 CCl═CH 2 , CF 3 CH═CHCl, and mixtures thereof, comprising:
(a) dehydrohalogenating at least one starting material selected from the group consisting of CF 3 CCl 2 CH 3 , CF 3 CHClCH 2 Cl, CF 3 CHClCH 2 F, CF 3 CH 2 CHCl 2 , CF 3 CHFCH 2 Cl, CF 3 CFClCH 3 , CF 3 CH 2 CHFCl, and mixtures thereof to produce a product mixture comprising CF 3 C≡CH impurity and said at least one hydrochlorotrifluoropropene product;
(b) contacting said product mixture with at least one amine to reduce the concentration of said CF 3 C≡CH impurity in said product mixture; and
(c) recovering said at least one hydrochlorotrifluoropropene product having reduced concentration of said CF 3 C≡CH impurity.
28. The process of claim 27 wherein at least one hydrochlorotrifluoropropene product is CF 3 CH═CHCl, and said at least one starting material is selected from the group consisting of CF 3 CHClCH 2 Cl, CF 3 CH 2 CHCl 2 , and mixtures thereof.
29. The process of claim 27 wherein at least one hydrochlorotrifluoropropene product is CF 3 CHCl═CH 2 , and said at least one starting material is selected from the group consisting of CF 3 CHClCH 2 Cl, CF 3 CCl 2 CH 3 , and mixtures thereof.
30. The process of claim 27 , wherein the concentration of said CF 3 C≡CH impurity in said product mixture is reduced to 200 ppm or less in the contacting step (b).
31. The process of claim 21 , wherein said at least one amine is selected from the group consisting of amine of the formula R 3 N, heterocyclic amines, and mixtures thereof, wherein each R is independently a hydrogen, an alkyl group, a heteroalkyl group, or an aralkyl group.