Azeotrope-like composition of 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb) and hydrogen fluoride (HF)
View Patent ↗Provided are azeotropic and azeotrope-like compositions of 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb) 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 consisting essentially of hydrogen fluoride and 2-chloro-1,1,1,2-tetrafluoropropane.
2. An azeotropic or azeotrope-like composition which consists essentially of from about 1 to about 50 weight percent hydrogen fluoride and from about 50 to about 99 weight percent 2-chloro-1,1,1,2-tetrafluoropropane based on the weight of the azeotropic or azeotrope-like composition, which composition has a boiling point of from about 0° C. to about 61° C. at a pressure of from about 14 psia to about 103 psia.
3. The composition of claim 2 which consists of hydrogen fluoride and 2-chloro-1,1,1,2-tetrafluoropropane.
4. The composition of claim 2 wherein the hydrogen fluoride is present in the composition in an amount from about 15 to about 40 weight percent.
5. The composition of claim 2 wherein the 2-chloro-1,1,1,2-tetrafluoropropane is present in the composition in an amount of from about 60 to about 85 weight percent.
6. The composition of claim 2 having a boiling point of about 0° C. at a pressure of about 14 psia; or a boiling point of about 25° C. at a pressure of about 37 psia; or a boiling point of about 61° C. at a pressure of about 103 psia.
7. A method of forming an azeotropic or azeotrope-like composition which comprises forming a blend consisting essentially of from about 1 to about 50 weight percent hydrogen fluoride and from about 50 to about 99 weight percent 2-chloro-1,1,1,2-tetrafluoropropane.
8. The method of claim 7 wherein the composition consists of hydrogen fluoride and 2-chloro-1,1,1,2-tetrafluoropropane.
9. The method of claim 7 wherein the hydrogen fluoride is present in the composition in amount from about 15 to about 40 weight percent.
10. The method of claim 7 wherein the 2-chloro-1,1,1,2-tetrafluoropropane is present in the composition in an amount of from about 60 to about 85 weight percent.
11. The method of claim 7 further comprising the step of separating 2-chloro-1,1,1,2-tetrafluoropropane from an azeotropic or azeotrope-like composition of 2-chloro-1,1,1,2-tetrafluoropropane and hydrogen fluoride using pressure swing distillation.
12. The method of claim 7 further comprising the step of feeding the azeotropic or azeotrope-like composition 2-chloro-1,1,1,2-tetrafluoropropane and hydrogen fluoride to a fluorination reactor.