Azeotrope-Like Composition of 2-Chloro-3,3,3-Trifluoropropene (HCFC-1233xf) and Hydrogen Fluoride (HF)
Provided are azeotropic and azeotrope-like compositions of 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) and hydrogen fluoride (HF). Such azeotropic and azeotrope-like compositions are useful as intermediates in the production of 2,3,3,3-tetrafluoropropene (HFO-1234yf).
1 . An azeotropic or azeotrope-like composition which consists essentially of from about 6.2 mole percent to about 59.9 mole percent hydrogen fluoride and from about 40.1 mole percent to about 93.8 mole percent 2-chloro-3,3,3-trifluoropropene, which composition has a boiling point of from about 0° C. to about 61° C. at a pressure of from about 15 psia to about 107 psia.
2 . The composition of claim 1 wherein the hydrogen fluoride is present in the amount from about 53.5 mole percent to about 59.9 mole percent.
3 . The composition of claim 1 wherein the 2-chloro-3,3,3-trifluoropropene is present in the amount from about 40.1 mole percent to about 46.5 mole percent.
4 . An azeotropic or azeotrope-like composition which consists essentially of from about 71.8 mole percent to about 90.7 mole percent hydrogen fluoride and from about 9.3 mole percent to about 28.2 mole percent 2-chloro-3,3,3-trifluoropropene, which composition has a boiling point of from about 0° C. to about 61° C. at a pressure of from about 15 psia to about 107 psia.
5 . The composition of claim 4 wherein the hydrogen fluoride is present in the amount from about 71.8 to about 86.7 weight percent.
6 . The composition of claim 4 wherein the hydrogen fluoride is present in the amount from about 71.8 to about 85.3 weight percent.
7 . The composition of claim 4 wherein the 2-chloro-3,3,3-trifluoropropene is present in the amount from about 13.3 mole percent to about 28.2 mole percent.
8 . The composition of claim 4 wherein the 2-chloro-3,3,3-trifluoropropene is present in the amount from about 14.7 mole percent to about 28.2 mole percent.
9 . A method of forming an azeotropic or azeotrope-like composition which comprises forming a blend which consists essentially of from about 6.2 mole percent to about 59.9 mole percent hydrogen fluoride and from about 40.1 mole percent to about 93.8 mole percent 2-chloro-3,3,3-trifluoropropene.
10 . The method of claim 9 wherein the hydrogen fluoride is present in the amount from about 53.5 mole percent to about 59.9 mole percent.
11 . The method of claim 9 wherein the 2-chloro-3,3,3-trifluoropropene is present in the amount from about 40.1 mole percent to about 46.5 mole percent.
12 . The method of claim 9 further comprising the step of separating 2-chloro-3,3,3-trifluoropropene from an azeotropic or azeotrope-like composition of 2-chloro-3,3,3-trifluoropropene and hydrogen fluoride using pressure swing distillation.
13 . The method of claim 9 further comprising the step of feeding the azeotropic or azeotrope-like composition of 2-chloro-3,3,3-trifluoropropene and hydrogen fluoride to a fluorination reactor as a source of hydrogen fluoride.
14 . A method of forming an azeotropic or azeotrope-like composition which comprises forming a blend which consists essentially of from about 71.8 mole percent to about 90.7 mole percent hydrogen fluoride and from about 9.3 mole percent to about 28.2 mole percent 2-chloro-3,3,3-trifluoropropene.
15 . The method of claim 14 wherein the hydrogen fluoride is present in the amount from about 71.8 to about 86.7 weight percent.
16 . The method of claim 14 wherein the hydrogen fluoride is present in the amount from about 71.8 to about 85.3 weight percent.
17 . The method of claim 14 wherein the 2-chloro-3,3,3-trifluoropropene is present in the amount from about 13.3 mole percent to about 28.2 mole percent.
18 . The method of claim 14 wherein the 2-chloro-3,3,3-trifluoropropene is present in the amount from about 14.7 mole percent to about 28.2 mole percent.
19 . The method of claim 14 further comprising the step of separating 2-chloro-3,3,3-trifluoropropene from an azeotropic or azeotrope-like composition of 2-chloro-3,3,3-trifluoropropene and hydrogen fluoride using pressure swing distillation.
20 . The method of claim 14 further comprising the step of feeding the azeotropic or azeotrope-like composition of 2-chloro-3,3,3-trifluoropropene and hydrogen fluoride to a fluorination reactor as a source of hydrogen fluoride.
21 . A method for removing 2-chloro-3,3,3-trifluoropropene from a mixture containing 2-chloro-3,3,3-trifluoropropene and at least one impurity, which comprises adding hydrogen fluoride to the mixture in an amount sufficient to form an azeotropic or azeotrope-like composition which consists essentially of from about 6.2 mole percent to about 59.9 mole percent hydrogen fluoride and from about 40.1 mole percent to about 93.7 mole percent 2-chloro-3,3,3-trifluoropropene, and thereafter separating the azeotropic composition from the impurity.
22 . The method of claim 21 wherein the hydrogen fluoride is present in the amount from about 53.5 mole percent to about 59.9 mole percent.
23 . The method of claim 21 wherein the 2-chloro-3,3,3-trifluoropropene is present in the amount from about 40.1 mole percent to about 46.5 mole percent.
24 . The method of claim 21 wherein the impurity does not form an azeotropic mixture with 2-chloro-3,3,3-trifluoropropene, hydrogen fluoride or a mixture of 2-chloro-3,3,3-trifluoropropene and hydrogen fluoride.
25 . The method of claim 21 wherein the impurity does form an azeotropic mixture with 2-chloro-3,3,3-trifluoropropene, hydrogen fluoride or a mixture of 2-chloro-3,3,3-trifluoropropene and hydrogen fluoride.
26 . The method of claim 21 wherein the impurity comprises a halocarbon.
27 . The method of claim 21 wherein the impurity is miscible with 2-chloro-3,3,3-trifluoropropene.
28 . The method of claim 21 wherein the impurity comprises one more of 1,1,1,2,3-pentachloropropane; 1,1,2,3-tetrachloropropene; 2,3,3,3-tetrafluoropropene; 2,3-dichloro-3,3-difluoropropene; 1,1,1,2,2-pentafluoropropane and 1,2-dichloro-3,3,3-trifluoropropene.
29 . The method of claim 21 wherein the separating is conducted by distillation.
30 . A method for removing 2-chloro-3,3,3-trifluoropropene from a mixture containing 2-chloro-3,3,3-trifluoropropene and at least one impurity, which comprises adding hydrogen fluoride to the mixture in an amount sufficient to form an azeotropic or azeotrope-like composition which consists essentially of from about 71.8 mole percent to about 90.7 mole percent hydrogen fluoride and from about 9.3 mole percent to about 28.2 mole percent 2-chloro-3,3,3-trifluoropropene, and thereafter separating the azeotropic composition from the impurity.
31 . The method of claim 30 wherein the hydrogen fluoride is present in the amount from about 71.8 to about 86.7 weight percent.
32 . The method of claim 30 wherein the hydrogen fluoride is present in the amount from about 71.8 to about 85.3 weight percent.
33 . The method of claim 30 wherein the 2-chloro-3,3,3-trifluoropropene is present in the amount from about 13.3 mole percent to about 28.2 mole percent.
34 . The method of claim 30 wherein the 2-chloro-3,3,3-trifluoropropene is present in the amount from about 14.7 mole percent to about 28.2 mole percent.
35 . The method of claim 30 wherein the impurity does not form an azeotropic mixture with 2-chloro-3,3,3-trifluoropropene, hydrogen fluoride or a mixture of 2-chloro-3,3,3-trifluoropropene and hydrogen fluoride.
36 . The method of claim 30 wherein the impurity does form an azeotropic mixture with 2-chloro-3,3,3-trifluoropropene, hydrogen fluoride or a mixture of 2-chloro-3,3,3-trifluoropropene and hydrogen fluoride.
37 . The method of claim 30 wherein the impurity comprises a halocarbon.
38 . The method of claim 30 wherein the impurity is miscible with 2-chloro-3,3,3-trifluoropropene.
39 . The method of claim 30 wherein the impurity comprises one more of 1,1,1,2,3-pentachloropropane; 1,1,2,3-tetrachloropropene; 2,3,3,3-tetrafluoropropene; 2,3-dichloro-3,3-difluoropropene; 1,1,1,2,2-pentafluoropropane and 1,2-dichloro-3,3,3-trifluoropropene.
40 . The method of claim 30 wherein the separating is conducted by distillation.