Azeotrope or azeotrope-like compositions of 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) and water
Heterogenous azeotrope or azeotrope-like compositions comprising 2-chloro-3,3,3-trifluoropropene (HFCO-1233xf) and water which may include from about 0.09 wt. % to about 92.69 wt. % 2-chloro-3,3,3-trifluoropropene (HFCO-1233xf) and from about 7.31 wt. % to about 99.91 wt. % water and having a boiling point between about 12.0° C. and about 13.6° C. at a pressure of between about 12.5 psia and about 16.5 psia. The azeotrope or azeotrope-like compositions may be used to separate impurities, including water, from 2-chloro-3,3,3-trifluoropropene (HFCO-1233xf).
1. A method of producing 2,3,3,3-tetrafluoropropene (HFO-1234yf) comprising:
providing a composition comprising an azeotrope or azeotrope-like composition consisting essentially of effective amounts of 2-chloro-3,3,3-trifluoropropene (HFCO-1233xf) and water;
converting at least some of the 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) present in the azeotrope or azeotrope-like composition into 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb); and
converting at least some of the 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb) into 2,3,3,3-tetrafluoropropene (HFO-1234yf).
2. The method of claim 1 , wherein the 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) is separated from the water before being converted into 2-chloro-1, 1, 1,2-tetrafluoropropane (HCFC-244bb).
3. The method of claim 1 , wherein converting at least some of the 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) into 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb) comprises reacting the 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) with HF, preferably anhydrous HF, in the presence of a catalyst.
4. The method of claim 3 , wherein the catalyst comprises a metal halide catalyst.
5. The method of claim 4 , wherein the catalyst comprises SbCl 5 .
6. The method of claim 3 , wherein the reaction is carried out at a temperature from 70° C. to 120° C.
7. The method of claim 3 , wherein the reaction is a liquid phase reaction.
8. The method of claim 3 , wherein the reaction is carried out at a pressure from 50 psig to 120 psig.
9. The method of claim 3 , wherein the reaction is carried out in a liquid phase reaction in the presence of SbCl 5 catalyst at a temperature from 70° C. to 120° C. and at a pressure from 50 psig to 120 psig.
10. The method of claim 1 , wherein converting at least some of the 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb) into 2,3,3,3-tetrafluoropropene (HFO-1234yf) comprises reacting the 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb) in a vapor phase reaction.
11. The method of claim 1 , wherein the step of providing an azeotrope or azeotrope-like composition consisting essentially of effective amounts of 2-chloro-3,3,3-trifluoropropene (HFCO-1233xf) and water comprises combining 2-chloro-3,3,3-trifluoropropene (HFCO-1233xf) and water to form an azeotrope or azeotrope-like composition.
12. The method of claim 1 , wherein the step of providing an azeotrope or azeotrope-like composition consisting essentially of effective amounts of 2-chloro-3,3,3-trifluoropropene (HFCO-1233xf) and water comprises modifying the relative amounts of 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) and water comprises:
adding 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) to the composition;
adding water to the composition; or
adding both 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) and water to the composition.
13. The method of claim 1 , wherein the azeotrope or azeotrope-like composition has a boiling point between about 12.0° C. and about 13.6° C. at a pressure of between about 12.5 psia and about 16.5 psia.
14. The method of claim 1 , wherein the azeotrope or azeotrope-like composition consists essentially of from about 0.09 wt. % to about 92.69 wt. % 2-chloro-3,3,3-trifluoropropene (HFCO-1233xf) and from about 7.31 wt. % to about 99.91 wt. % water.
15. The method of claim 1 , wherein the azeotrope or azeotrope-like composition consists essentially of from about 65 wt. % to about 90 wt. % 2-chloro-3,3,3-trifluoropropene (HFCO-1233xf) and from about 10 wt. % to about 35 wt. % water.
16. The method of claim 1 , wherein the azeotrope or azeotrope-like composition consists essentially of from about 65.14 wt. % to about 86.25 wt. % 2-chloro-3,3,3-trifluoropropene (HFCO-1233xf) and from about 13.75 wt. % to about 34.86 wt. % water.
17. The method of claim 4 , wherein the catalyst comprises TiCl 4 .
18. The method of claim 4 , wherein the catalyst comprises SbF 5 .