Methods for separation of azeotrope or azeotrope-like compositions of trifluoroiodomethane (CF3I) and trifluoroacetyl chloride (CF3COCI)

Patent metadata

Field	Value
Publication number	US-11565992-B2
Application number	US-202117523200-A
Country	US
Kind code	B2
Filing date	Nov 10, 2021
Priority date	Nov 13, 2020
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

The present disclosure provides azeotrope or azeotrope-like compositions including trifluoroiodomethane (CF3I) and trifluoroacetyl chloride (CF3COCl), methods of forming same, and methods of separating, or breaking, the azeotrope or azeotrope-like compositions of trifluoroiodomethane (CF3I) and trifluoroacetyl chloride (CF3COCl).

First claim

What is claimed is:

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.

Assignees

• Honeywell Int Inc

Inventors

• Kopkalli Haluk
• Close Joshua
• Harikumar Warrier Pramod K W
• Merkel Daniel C

Classifications

• C07C45/83 Primary

  by extractive distillation · CPC title

• C07C53/48

  Halogenated acetyl halides · CPC title

• C07C51/48

  by liquid-liquid treatment · CPC title

• C07C17/383

  by distillation · CPC title

• C07C17/386 Primary

  with auxiliary compounds · CPC title