Azeotropic compositions of 1,1,1,3,3-pentachloropropane and hydrogen fluoride
View Patent ↗Provided are methods for forming azeotropic or azeotrope-like mixtures of 1,1,1,3,3-pentachloro-propane (240fa) and hydrogen fluoride. Such compositions are useful as an intermediate in the production of HFC-245fa and HCFO-1233zd.
1. A method of forming an azeotropic or azeotrope-like composition which consists of blending from about 90 to about 97 weight percent hydrogen fluoride and from about 10 to about 3 weight percent 1,1,1,3,3-pentachloropropane (240fa), which composition has a boiling point of about 24° C. to about 60° C. at pressure of about 17.8 psia to pressure of about 55.4 psia.
2. The method of claim 1 , wherein the composition consists of hydrogen fluoride and 1,1,1,3,3-pentachloropropane (240fa).
3. The method of claim 1 , wherein the composition consists of about 92±2 weight percent HF and about 8±2 weight percent 240fa and has a boiling point of about 24° C. at 17.8 psia.
4. A method of forming an azeotropic or azeotrope-like composition which consists of blending hydrogen fluoride and 1,1,1,3,3-pentachloropropane (240fa), which composition has a boiling point of about 24° C. to about 60° C. at pressure of about 17.8 psia to pressure of about 55.4 psia.
5. The method of claim 4 , wherein the composition comprises from about 99 to about 1 weight percent HF.
6. The method of claim 4 , wherein the composition comprises from about 40 weight percent to about 97 weight percent HF.
7. The method of claim 4 , wherein the composition comprises from about from about 90 to about 97 weight percent HF.
8. The method of claim 4 , wherein the composition comprises from about 60 to about 3 weight percent 240fa.
9. The method of claim 4 , wherein the composition comprises from about 90 weight percent to about 95 weight percent 240fa.
10. The method of claim 4 , wherein the composition comprises from about 10 weight percent to about 3 weight percent 240fa.
11. The method of claim 4 , wherein the composition has a boiling point of about from 24° C. to about 60° C. at a pressure from about 17.8 psia to about 55.4 psia.
12. A method of separating 240fa from the azeotropic like mixture of 240fa and HF consists of the step of extracting the HF from the mixture.
13. The method of claim 12 , wherein the extraction of HF is accomplished using water or other aqueous solution.
14. The method of claim 12 , wherein the extraction of HF is accomplished using sulfuric acid.
15. The method of claim 12 , wherein the extraction of HF is accomplished by distillation.
16. The method of claim 12 , wherein the distillation comprises extractive distillation.
17. The method of claim 12 , wherein the distillation comprises pressure swing distillation.