Azeotrope or azeotrope-like compositions of trifluoroiodomethane (CF3I) and trifluoroacetyl chloride (CF3COCI)

Patent metadata

Field	Value
Publication number	US-11208582-B2
Application number	US-202016874319-A
Country	US
Kind code	B2
Filing date	May 14, 2020
Priority date	May 20, 2019
Publication date	Dec 28, 2021
Grant date	Dec 28, 2021

Abstract

The present disclosure provides azeotrope or azeotrope-like compositions including trifluoroiodomethane (CF3I) and trifluoroacetyl chloride (CF3COCl), and a method of forming an azeotrope or azeotrope-like composition comprising the step of combining trifluoroacetyl chloride (CF3COCl) and trifluoroiodomethane (CF3I) to form an azeotrope or azeotrope-like composition.

First claim

What is claimed is:

1. A composition comprising an azeotrope or azeotrope-like composition consisting essentially of effective amounts of trifluoroacetyl chloride (CF 3 COCl) and trifluoroiodomethane (CF 3 I).

2. The composition of claim 1 , wherein the azeotrope or azeotrope-like composition has a boiling point between about −46.0° C. and about 90.0° C. at a pressure of between about 4.9 psia and about 348 psia.

3. The composition of claim 2 , 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).

4. The composition of claim 1 , wherein the azeotrope or azeotrope-like composition has a boiling point of about −22.50° C.±0.30° C. at a pressure of about 14.41 psia±0.30 psia.

5. The composition of claim 2 , wherein the azeotrope or azeotrope-like composition consists essentially of from about 0.5 wt. % to about 25 wt. % trifluoroacetyl chloride (CF 3 COCl) and from about 75 wt. % to about 99.5 wt. % trifluoroiodomethane (CF 3 I).

6. The composition of claim 2 , wherein the azeotrope or azeotrope-like composition consists essentially of from about 2 wt. % to about 21 wt. % trifluoroacetyl chloride (CF 3 COCl) and from about 79 wt. % to about 98 wt. % trifluoroiodomethane (CF 3 I).

7. The composition of claim 2 , wherein the azeotrope or azeotrope-like composition consists essentially of from about 14 wt. % to about 18 wt. % trifluoroacetyl chloride (CF 3 COCl) and from about 82 wt. % to about 86 wt. % trifluoroiodomethane (CF 3 I).

8. The composition of claim 1 , comprising an azeotrope or azeotrope-like composition consisting essentially of trifluoroacetyl chloride (CF 3 COCl) and trifluoroiodomethane (CF 3 I) and having a boiling point of about −22.50° C.±0.30° C. at a pressure of about 14.41 psia±0.30 psia.

9. The composition of claim 8 , wherein the azeotrope or azeotrope-like composition consists essentially of from about 0.5 wt. % to about 25 wt. % trifluoroacetyl chloride (CF 3 COCl)) and from about 75 wt. % to about 99.5 wt. % trifluoroiodomethane (CF 3 I).

10. The composition of claim 8 , wherein the azeotrope or azeotrope-like composition consists essentially of from about 2 wt. % to about 21 wt. % trifluoroacetyl chloride (CF 3 COCl) and from about 79 wt. % to about 98 wt. % trifluoroiodomethane (CF 3 I).

11. The composition of claim 8 , wherein the azeotrope or azeotrope-like composition consists essentially of from about 14 wt. % to about 18 wt. % trifluoroacetyl chloride (CF 3 COCl) and from about 82 wt. % to about 86 wt. % trifluoroiodomethane (CF 3 I).

12. A method of separating an azeotrope or azeotrope-like mixture of trifluoroacetyl chloride (CF 3 COCl) and trifluoroiodomethane (CF 3 I), comprising:
conveying a feed stream comprising an azeotrope or azeotrope-like composition consisting essentially of effective amounts of trifluoroacetyl chloride (CF 3 COCl) and trifluoroiodomethane (CF 3 I) to a low-pressure column to provide a first bottoms product and a first distillate;
collecting the first bottoms product from the low-pressure column;
conveying the first distillate from the low-pressure column to a high-pressure column, the first distillate comprising an azeotrope or azeotrope-like composition consisting essentially of effective amounts of trifluoroacetyl chloride (CF 3 COCl) and trifluoroiodomethane (CF 3 I); and
collecting a second bottoms product from the high-pressure column.

13. The method of claim 12 , 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).

14. The method of claim 13 , wherein the azeotrope or azeotrope-like composition has a boiling point between about −46.0° C. and about 90.0° C. at a pressure of between about 4.9 psia and about 348 psia.

15. The method of claim 12 , wherein the first bottoms product consists essentially of trifluoroacetyl chloride (CF 3 COCl).

16. The method of claim 12 , wherein the second bottoms product consists essentially of trifluoroiodomethane (CF 3 I).

17. The method of claim 12 , wherein the first bottoms product consists essentially of trifluoroiodomethane (CF 3 I).

18. A method of separating trifluoroacetyl chloride (CF 3 COCl) and trifluoroiodomethane (CF 3 I) from a primary composition comprising trifluoroacetyl chloride (CF 3 COCl), trifluoroiodomethane (CF 3 I) and at least one impurity, comprising the steps of:
forming, within the primary composition, a secondary composition which is an azeotrope or azeotrope-like composition consisting essentially of effective amounts of trifluoroacetyl chloride (CF 3 COCl) and trifluoroiodomethane (CF 3 I) having a boiling point between about −46.0° C. and about 90.0° C. at a pressure of between about 4.9 psia and about 348 psia; and
separating the secondary composition from the primary composition and the at least one impurity.

19. The method of claim 18 , comprising the additional steps, prior to the forming step, of:
providing a composition which includes one of trifluoroiodomethane (CF 3 I) and trifluoroacetyl chloride (CF 3 COCl), together with at least one impurity; and
adding a sufficient amount of the other of trifluoroiodomethane (CF 3 I) and trifluoroacetyl chloride (CF 3 COCl).

Assignees

• Honeywell Int Inc

Inventors

• Pham Hang T
• Hulse Ryan J
• Singh Rajiv Ratna
• Nair Haridasan K

Classifications

• C07C17/386

  with auxiliary compounds · CPC title

• C07C53/48

  Halogenated acetyl halides · CPC title

• C07C51/64 Primary

  Separation; Purification; Stabilisation; Use of additives · CPC title

• C07C19/16

  and iodine · CPC title

• C07C49/16 Primary

  containing halogen · CPC title