Methods for removal HI/I2/HI3 from trifluoroacetyl iodide (TFAI) feedstock and pyrolysis reactor effluent

Patent metadata

Field	Value
Publication number	US-11912641-B2
Application number	US-202217893504-A
Country	US
Kind code	B2
Filing date	Aug 23, 2022
Priority date	Oct 14, 2020
Publication date	Feb 27, 2024
Grant date	Feb 27, 2024

Abstract

A method of producing trifluoroiodomethane (CF 3 I) includes providing a feedstock comprising trifluoroacetyl iodide (TFAI), passing the feedstock through at least one column charged with carbonaceous materials to remove hydrogen iodide (HI), hydrogen triiodide (HI 3 ) and iodine (I 2 ) from the feedstock, and providing the feedstock to a reactor to produce a trifluoroiodomethane product stream.
Another method of producing trifluoroiodomethane (CF 3 I) includes providing a feedstock comprising trifluoroacetyl iodide (TFAI) to a reactor to produce a trifluoroiodomethane product stream, and passing the trifluoroiodomethane product stream from the reactor through at least one column charged with carbonaceous materials to remove hydrogen iodide (HI), hydrogen triiodide (HI3) and iodine (I2) from the trifluoroiodomethane product stream.

First claim

What is claimed is:

1. A method of producing trifluoroiodomethane (CF 3 I), the method comprising:
providing a feedstock comprising trifluoroacetyl iodide (TFAI);
passing the feedstock through at least one column charged with carbonaceous materials to remove at least one of hydrogen iodide (HI), hydrogen triiodide (HI 3 ) and iodine (I 2 ) from the feedstock; and
providing the feedstock to a reactor to produce a trifluoroiodomethane product stream.

2. The method of claim 1 , wherein passing the feedstock through at least one column charged with carbonaceous materials comprises passing the feedstock through the at least one column immediately prior to providing the feedstock to a reactor.

3. The method of claim 1 , wherein passing the feedstock through at least one column charged with carbonaceous materials comprises recirculating the feedstock through the at least one column before providing the feedstock to the reactor.

4. The method of claim 1 , wherein the at least one column charged with carbonaceous materials includes at least two columns and passing the feedstock through at least one column charged with carbonaceous materials comprises recirculating the feedstock through one of the two columns and then passing the feedstock through the other of the two columns immediately prior to providing the feedstock to a reactor.

5. The method of claim 1 , wherein the at least one column is operated at a temperature of about 0° C. to about 100° C.

6. The method of claim 1 , wherein the at least one column is operated at a pressure of about 0 psig to about 300 psig.

7. The method of claim 1 , wherein the carbonaceous materials are selected from the group consisting of: activated carbon, carbon black, and carbon molecular sieves.

8. The method of claim 7 , wherein the carbonaceous materials comprise activated carbon having an iodine number of at least 500 and a surface area of at least 900 m 2 /g.

9. The method of claim 7 , wherein the carbonaceous materials comprise carbon black having an iodine number of at least 500 and a surface area of at least 400 m 2 /g.

10. The method of claim 7 , wherein the carbonaceous materials comprise carbon molecular sieves have a pore size of at least about 2 Å.

11. The method of claim 1 , wherein at least one column charged with carbonaceous materials is at least one first column, the method further comprising:
passing the trifluoroiodomethane product stream from the reactor through at least one second column charged with carbonaceous materials to remove at least one of hydrogen iodide (HI), hydrogen triiodide (HI 3 ) and iodine (I 2 ) from the trifluoroiodomethane product stream.

12. The method of claim 11 , wherein the at least one first column is operated at a temperature of about 0° C. to about 100° C. and the second column is operated at a temperature of about 0° C. to about 100° C.

13. The method of claim 11 , wherein the at least one first column is operated at a pressure of about 0 psig to about 300 psig.

14. The method of claim 11 , wherein the carbonaceous materials in the at least one second column are chosen from the group consisting of: activated carbon, carbon black, and carbon molecular sieves.

15. A method of producing trifluoroiodomethane (CF 3 I), the method comprising:
providing a feedstock comprising trifluoroacetyl iodide (TFAI) to a reactor to produce a trifluoroiodomethane product stream; and
passing the trifluoroiodomethane product stream from the reactor through at least one column charged with carbonaceous materials to remove at least one of hydrogen iodide (HI), hydrogen triiodide (HI 3 ) and iodine (I 2 ) from the trifluoroiodomethane product stream.

16. The method of claim 15 , wherein the at least one column is operated at a temperature of about 0° C. to about 100° C.

17. The method of claim 15 , wherein the carbonaceous materials are chosen from the group consisting of: activated carbon, carbon black, and carbon molecular sieves.

18. The method of claim 17 , wherein the carbonaceous materials comprise activated carbon having an iodine number of at least 500 and a surface area of at least 900 m 2 /g.

19. The method of claim 17 , wherein the carbonaceous materials comprise carbon black having an iodine number of at least 500 and a surface area of at least 400 m 2 /g.

20. The method of claim 17 , wherein the carbonaceous materials comprise carbon molecular sieves have a pore size of at least about 2 Å.

Assignees

• Honeywell Int Inc

Inventors

• Wang Haiyou
• Merkel Daniel C

Classifications

• C07C17/389 Primary

  by adsorption on solids · CPC title

• C07C17/18

  of oxygen atoms of carbonyl groups · CPC title

• C07C51/47

  by solid-liquid treatment; by chemisorption · CPC title

• C07C53/48

  Halogenated acetyl halides · CPC title

• C07C19/08

  containing fluorine · CPC title