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

Patent metadata

Field	Value
Publication number	US-2016347693-A1
Application number	US-201615234409-A
Country	US
Kind code	A1
Filing date	Aug 11, 2016
Priority date	Feb 20, 2014
Publication date	Dec 1, 2016
Grant date	—

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 purifying a fluid containing trifluoroethylene, which comprises bringing a fluid containing trifluoroethylene and 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, into contact with at least one type of synthetic zeolite selected from synthetic zeolites 3A, 4A and 5A to remove the C 1-5 alkane or alkene.

2 . The method for purifying a fluid containing trifluoroethylene according to claim 1 , wherein the C 1-5 alkane or alkene is at least one compound selected from the group consisting of chloromethane, fluoromethane, difluoromethane, chlorofluoromethane, trifluoromethane, chlorodifluoromethane, dichlorodifluoromethane, 1,1,2-trichloro-1,2,2-trifluoroethane, 1,2-dichloro-1,1,2-trifluoroethane, 1-chloro-1,2,2,2-tetrafluoroethane, 1-chloro-1,1,2,2-tetrafluoroethane, pentafluoroethane, 1-chloro-1,2,2-trifluoroethane, 1-chloro-1,1,2-trifluoroethane, 1,1,2,2-tetrafluoroethane, 1,1,1,2-tetrafluoroethane, 2-chloro-1,1-difluoroethane, 1-chloro-1,1-difluoroethane, 1,1,2-trifluoroethane, 1,1,1-trifluoroethane, 1,1-difluoroethane, 1,2-difluoroethane, 1,1,1,2,2,3,3-heptafluoropropane, 1,1,1,2,3,3, 3-heptafluoropropane, 1,1,1,3,3, 3-hexafluoropropane, 1,1,1,2,3,3-hexafluoropropane, E- and/or Z-1,2-difluoroethylene, 1,1-difluoroethylene, fluoroethylene, 3,3-difluoropropene, 3,3,3-trifluoropropene, 2,3,3,3-tetrafluoropropene, E- and/or Z-1,3,3,3-tetrafluoropropene, hexafluoropropene, chlorotrifluoroethylene, 1-chloro-2,2-difluoroethylene, E- and/or Z-1,2-dichlorofluoroethylene, E- and/or Z-1,2-dichloro-1,2-difluoroethylene, tetrafluoroethylene, E- and/or Z-1-chloro-2-fluoroethylene, perfluorocyclobutane, methane, ethane, ethylene, propane, propylene, n-butane, isobutane, 1-n-butene, 2-n-butene and isobutene.

3 . The method for purifying a fluid containing trifluoroethylene according to claim 1 , wherein the C 1-5 alkane or alkene is (E)-1,2-difluoroethylene, and the synthetic zeolite is synthetic zeolite 4A and/or 5A.

4 . The method for purifying a fluid containing trifluoroethylene according to claim 1 , wherein the fluid further contains water, the synthetic zeolite is synthetic zeolite 3A, and water is removed by the contact.

5 . The method for purifying a fluid containing trifluoroethylene according to claim 1 , wherein the synthetic zeolite is one preliminarily subjected to a heat treatment by a dry gas of from 100 to 400° C., or one preliminarily subjected to a heat treatment under reduced pressure.

6 . A method for producing trifluoroethylene, which comprises a purification step of bringing a fluid containing trifluoroethylene and 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, into contact with at least one type of synthetic zeolite selected from synthetic zeolites 3A, 4A and 5A to purify the fluid.

7 . The method for producing trifluoroethylene according to claim 6 , which comprises a production step of reducing chlorotrifluoroethylene with hydrogen gas in the presence of a catalyst to produce a fluid containing trifluoroethylene and 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, and the above preparation step.

8 . The method for producing trifluoroethylene according to claim 6 , which comprises a production step of subjecting a composition containing chlorodifluoromethane and/or tetrafluoroethylene and chlorofluoromethane to a synthetic reaction involving heat decomposition in the presence of a heating fluid to produce a fluid containing trifluoroethylene and 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, and the above purification step.

9 . The method for producing trifluoroethylene according to claim 6 , which comprises a production step of subjecting 1,1,1,2-tetrafluoroethane to dehydrofluorination in the presence of an alkali metal and/or an alkaline earth metal to produce a fluid containing trifluoroethylene and 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, and the above purification step.

10 . The method for producing trifluoroethylene according to claim 6 , wherein the synthetic zeolite is one preliminarily subjected to a heat treatment by a dry gas of from 100 to 400° C. or one preliminarily subjected to a heat treatment under reduced pressure.

Assignees

• Asahi Glass Co Ltd

Inventors

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

Classifications

• C07C17/37

  by disproportionation of halogenated hydrocarbons · CPC title

• C07C17/269

  of only halogenated hydrocarbons · CPC title

• C07C17/354

  by hydrogenation · CPC title

• C07C17/389

  by adsorption on solids · CPC title

• C07C17/23 Primary

  by dehalogenation · CPC title