Method for purifying fluid that includes trifluoroethylene, and method for producing trifluoroethylene

Patent metadata

Field	Value
Publication number	US-9862660-B2
Application number	US-201615234409-A
Country	US
Kind code	B2
Filing date	Aug 11, 2016
Priority date	Feb 20, 2014
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

To provide a method for purifying trifluoroethylene, by which from a fluid containing trifluoroethylene, a C 1-5 alkane or alkene (excluding trifluoroethylene) in which at least one hydrogen atom may be substituted with a chlorine atom or a fluorine atom can be efficiently removed, and a method for producing trifluoroethylene by which trifluoroethylene can be efficiently produced.
A fluid containing trifluoroethylene is brought into contact with at least one type of synthetic zeolite selected from synthetic zeolites 3A, 4A and 5A.

First claim

What is claimed is:

1. A method for producing trifluoroethylene, the method comprising:
bringing a fluid comprising trifluoroethylene and (E)-1,2-difluoroethylene into contact with at least one synthetic zeolite selected from the group consisting of synthetic zeolites 4A and 5A such that (E)-1,2-difluoroethylene is adsorbed in the at least one synthetic zeolite.

2. The method according to claim 1 , further comprising:
reducing chlorotrifluoroethylene with hydrogen gas in the presence of a catalyst to produce the fluid before the fluid is brought into contact with the at least one synthetic zeolite.

3. The method according to claim 1 , further comprising:
subjecting a composition comprising chlorodifluoromethane and/or tetrafluoroethylene and chlorofluoromethane to a synthetic reaction involving heat decomposition in the presence of a heating fluid to produce the fluid before the fluid is brought into contact with the at least one synthetic zeolite.

4. The method according to claim 1 , further comprising:
subjecting 1,1,1,2-tetrafluoroethane to dehydrofluorination in the presence of an alkali metal and/or an alkaline earth metal to produce the fluid before the fluid is brought into contact with the at least one synthetic zeolite.

5. The method according to claim 1 , wherein the synthetic zeolite is subjected to a heat treatment by a dry gas of from 100 to 400° C. or subjected to a heat treatment under reduced pressure before the fluid is brought into contact with the at least one synthetic zeolite.

6. A method for producing trifluoroethylene, the method comprising:
bringing a fluid comprising trifluoroethylene, (E)-1,2-difluoroethylene and water, into contact with synthetic zeolites 3A such that (E)-1,2-difluoroethylene and water are adsorbed in the synthetic zeolite 3A.

7. The method according to claim 6 , further comprising:
reducing chlorotrifluoroethylene with hydrogen gas in the presence of a catalyst to produce the fluid before the fluid is brought into contact with the synthetic zeolite 3A.

8. The method according to claim 6 , further comprising:
subjecting a composition comprising chlorodifluoromethane and/or tetrafluoroethylene and chlorofluoromethane to a synthetic reaction involving heat decomposition in the presence of a heating fluid to produce the fluid before the fluid is brought into contact with the synthetic zeolite 3A.

9. The method according to claim 6 , further comprising:
subjecting 1,1,1,2-tetrafluoroethane to dehydrofluorination in the presence of an alkali metal and/or an alkaline earth metal to produce the fluid before the fluid is brought into contact with the synthetic zeolite 3A.

10. The method according to claim 6 , wherein the synthetic zeolite is subjected to a heat treatment by a dry gas of from 100 to 400° C. or subjected to a heat treatment under reduced pressure before the fluid is brought into contact with the synthetic zeolite 3A.

Assignees

• Asahi Glass Co Ltd

Inventors

• Fukushima Masato
• Kawaguchi Satoshi
• Shigematsu Maki
• Kadowaki Yoshinobu
• Tanaami Yukio

Classifications

• C07C17/23 Primary

  by dehalogenation · CPC title

• C07C17/25

  by splitting-off hydrogen halides from halogenated hydrocarbons · CPC title

• C07C17/269

  of only halogenated hydrocarbons · CPC title

• C07C17/389

  by adsorption on solids · CPC title

• C07C17/354

  by hydrogenation · CPC title