Methods for separation of azeotrope or azeotrope-like compositions of trifluoroiodomethane (CF
The present disclosure provides azeotrope or azeotrope-like compositions including trifluoroiodomethane (CF 3 I) and trifluoroacetyl chloride (CF 3 COCl), methods of forming same, and methods of separating, or breaking, the azeotrope or azeotrope-like compositions of trifluoroiodomethane (CF 3 I) and trifluoroacetyl chloride (CF 3 COCl).
1. A method of breaking an azeotrope or azeotrope-like composition comprising trifluoroiodomethane (CF 3 I) and trifluoroacetyl chloride (CF 3 COCl), comprising:
contacting the azeotrope or azeotrope-like composition with a solvent that selectively absorbs the trifluoroiodomethane (CF 3 I);
extracting the trifluoroiodomethane (CF 3 I) into the solvent to form a first composition comprising the solvent and the trifluoroiodomethane (CF 3 I) and a second composition comprising the trifluoroacetyl chloride (CF 3 COCl); and
separating the first and second compositions.
2. The method of claim 1 , wherein the azeotrope or azeotrope-like composition consists essentially of from about 0.5 wt. % to about 99.0 wt. % trifluoroacetyl chloride (CF 3 COCl) and from about 1.0 wt. % to about 99.5 wt. % trifluoroiodomethane (CF 3 I).
3. The method of claim 1 , wherein the solvent is selected from the group consisting of toluene, mineral oil, and acetonitrile.
4. The method of claim 3 , wherein the solvent comprises toluene.
5. The method of claim 3 , wherein the solvent comprises mineral oil.
6. The method of claim 3 , wherein the solvent comprises acetonitrile.
7. The method of claim 1 , wherein the separating step further comprises extractive distillation.
8. The method of claim 7 , further comprising the additional step, following the separating step, of distilling the first composition.
9. The method of claim 8 , wherein the distillation of the first composition produces a product stream comprising trifluoroiodomethane (CF 3 I).
10. The method of claim 9 , wherein the trifluoroiodomethane (CF 3 I) contains trifluoroacetyl chloride (CF 3 COCl) in an amount of about 1 wt. % or less.
11. A method of separating the components of an azeotrope or azeotrope-like composition comprising trifluoroacetyl chloride (CF 3 COCl) and trifluoroiodomethane (CF 3 I) comprising:
contacting, within an extractive distillation column, the azeotrope or azeotrope-like composition with a solvent that selectively absorbs the trifluoroiodomethane (CF 3 I) to form a first composition including the solvent and trifluoroiodomethane (CF 3 I) and a second composition comprising trifluoroacetyl chloride (CF 3 COCl); and
distilling the first and second compositions to provide a first distillate comprising trifluoroacetyl chloride (CF 3 COCl) and a first bottoms product comprising the solvent and trifluoroiodomethane (CF 3 I).
12. The method of claim 11 , wherein the solvent is selected from the group consisting of toluene, mineral oil, and acetonitrile.
13. The method of claim 12 , wherein the solvent comprises toluene.
14. The method of claim 11 , further comprising, after the distilling step, the additional step of distilling the first bottoms product to produce a second distillate and a second bottoms product.
15. The method of claim 14 , wherein the second distillate comprises a product stream comprising trifluoroiodomethane (CF 3 I).
16. The method of claim 15 , wherein the trifluoroiodomethane (CF 3 I) contains trifluoroacetyl chloride (CF 3 COCl) in an amount of about 1 wt. % or less.
17. The method of claim 12 , wherein the solvent comprises mineral oil.
18. The method of claim 12 , wherein the solvent comprises acetonitrile.