1,3,3,3-tetrafluoropropene process azeotropes with HF
View Patent ↗The present invention pertains to azeotropic and azeotrope-like compositions of the following three blends: 1. Trans-1,3,3,3-tetrafluoropropene (HFO-1234ze(E)), cis-1,3,3,3-tetrafluoropropene (HFO-1234ze(Z)) and hydrogen fluoride (HF); 2. HFO-1234ze(E), 1,1,1,3,3-pentafluoropropane (HFC-245fa) and HF; and 3. HFO-1234ze(Z), HFC-245fa and HF. These azeotropic and azeotrope-like compositions are useful as intermediates in the production of HFO-1234ze(E).
1. An azeotrope or azeotrope-like composition consisting essentially of from about 1 to about 30 weight percent hydrogen fluoride, about 1 to 30 weight percent HFO-1234ze(Z) and from about 50 to about 99 weight percent HFO-1234ze(E), and having a boiling point of from about 0° C. to about 60° C. at a pressure of from about 30 psia to about 211 psia.
2. The composition of claim 1 , having a boiling point of about 0° C. at a pressure of about 35±5 psia.
3. The composition of claim 1 , having a boiling point of about 25° C. at a pressure of about 81±5 psia.
4. The composition of claim 1 , having a boiling point of about 60° C. at a pressure of about 206±5 psia.
5. An azeotrope or azeotrope-like composition consisting essentially of from about 1 to about 30 weight percent hydrogen fluoride, about 20 to 80 weight percent HFO-1234ze(Z) and from about 10 to about 60 weight percent HFC-245fa, and having a boiling point of from about 0° C. to about 60° C. at a pressure of from about 9 psia to about 105 psia.
6. The composition of claim 5 , having a boiling point of about 0° C. at a pressure of about 13±4 psia.
7. The composition of claim 5 , having a boiling point of about 25° C. at a pressure of about 35±5 psia.
8. The composition of claim 5 , having a boiling point of about 60° C. at a pressure of about 100±5 psia.
9. A method of forming an azeotropic or azeotrope-like composition which comprises forming a blend consisting essentially of from about 1 to about 30 weight percent hydrogen fluoride, about 1 to 30 weight percent HFO-1234ze(Z) and from about 50 to about 99 weight percent HFO-1234ze(E) to thereby form an azeotropic or azeotrope-like composition having a boiling point of from about 0° C. to about 60° C. at a pressure of from about 30 psia to about 211 psia.
10. A method of forming an azeotropic or azeotrope-like composition which comprises forming a blend consisting essentially of from about 1 to about 30 weight percent hydrogen fluoride, about 20 to 80 weight percent HFO-1234ze(Z) and from about 10 to about 60 weight percent HFC-245fa to thereby form an azeotropic or azeotrope-like composition having a boiling point of from about 0° C. to about 60° C. at a pressure of from about 9 psia to about 105 psia.
11. A method of separating the composition of claim 1 comprising swing distillation of the composition.
12. The method of claim 11 , further comprising an initial step of removing the HF from the composition.
13. The method of claim 12 , wherein the HF removal is accomplished by scrubbing with sulfuric acid, water and/or a basic solution.
14. A method of separating the composition of claim 1 comprising, extractive distillation.
15. The method of claim 14 , further comprising an initial step of removing the HF from the composition.
16. The method of claim 15 , wherein the HF removal is accomplished by scrubbing with sulfuric acid, water and/or a basic solution.
17. A method of separating the composition of claim 5 comprising swing distillation of the composition.
18. The method of claim 17 , further comprising an initial step of removing the HF from the composition.
19. The method of claim 18 , wherein the HF removal is accomplished by scrubbing with sulfuric acid, water and/or a basic solution.
20. A method of separating the composition of claim 5 comprising, extractive distillation.
21. The method of claim 20 , further comprising an initial step of removing the HF from the composition.
22. The method of claim 21 , wherein the HF removal is accomplished by scrubbing with sulfuric acid, water and/or a basic solution.