Method for producing trifluoroethylene

Patent metadata

Field	Value
Publication number	US-9802878-B2
Application number	US-201615218120-A
Country	US
Kind code	B2
Filing date	Jul 25, 2016
Priority date	Jan 30, 2014
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

A method to stably produce trifluoroethylene with a high selectivity by reacting 1,1,1,2-tetrafluoroethane with a solid reactant and suppressing the formation of by-products such as polymer carbon is provided. In the method, a material gas containing 1,1,1,2-tetrafluoroethane passes through a layer consisting of a particulate solid reactant having an average particle size of from 1 μm to 5,000 μm to bring the solid reactant and 1,1,1,2-tetrafluoroethane into contact with each other in a state where the layer consisting of the solid reactant is fluidized.

First claim

What is claimed is:

1. A method for producing trifluoroethylene, the method comprising:
passing a material gas containing 1,1,1,2-tetrafluoroethane through a layer consisting of a particulate solid reactant having an average particle size of from 1 μm to 5,000 μm to bring the solid reactant and 1,1,1,2-tetrafluoroethane into contact with each other in a state where the layer consisting of the solid reactant is fluidized,
wherein
the solid reactant contains at least one metal compound selected from the group consisting of a metal oxide, a metal hydroxide, a metal carbonate, a metal sulfate, and a metal halide,
the metal species contained in the metal compound is at least one metal selected from the group consisting of an alkali metal, an alkaline earth metal, a group 13 metal, and a group 14 metal, and
a linear flow velocity of the material gas is from 1 cm/s to 1,000 cm/s.

2. The method according to claim 1 , wherein the solid reactant has an average particle size of from 40 μm to 500 μm.

3. The method according to claim 1 , wherein the linear flow velocity of the material gas is from 1 cm/s to 20 cm/s.

4. The method according to claim 1 , wherein the solid reactant is potassium carbonate and/or calcium oxide.

5. The method according to claim 1 , wherein 1,1,1,2-tetrafluoroethane and the solid reactant are brought into contact with each other at a temperature of from 100° C. to 500° C.

6. The method according to claim 5 , wherein 1,1,1,2-tetrafluoroethane and the solid reactant are brought into contact with each other at a temperature of from 350° C. to 500° C.

7. The method according to claim 1 , wherein 1,1,1,2-tetrafluoroethane and the solid reactant are brought into contact with each other at a gauge pressure of from 0 to 5 MPa.

8. The method according to claim 1 , wherein 1,1,1,2-tetrafluoroethane contacts the solid reactant for a period of time of from 0.1 second to 100 seconds.

9. The method according to claim 8 , wherein the period of time is from 0.1 second to 20 seconds.

10. The method according to claim 1 , wherein a content of 1,1,1,2-tetrafluoroethane in the material gas is from 1 mol % to 100 mol %.

11. The method according to claim 1 , wherein the material gas further contains a diluent gas, and a content of the diluent gas is at most 95 mol % based on an entire amount of the material gas.

12. The method according to claim 1 , wherein the material gas further contains 1,1,2,2-tetrafluoroethane, and a content of 1,1,2,2-tetrafluoroethane is less than 50 mol % based on a total amount of 1,1,1,2-tetrafluoroethane and 1,1,2,2-tetrafluoroethane.

Assignees

• Asahi Glass Co Ltd

Inventors

• Nakamura Masahiko
• Okamoto Hidekazu

Classifications

• B01J2208/0007

  Pressure measurement · CPC title

• C09K2205/126

  Unsaturated fluorinated hydrocarbons · CPC title

• B01J27/232

  Carbonates · CPC title

• B01J23/02

  of the alkali- or alkaline earth metals or beryllium · CPC title

• B01J2208/00415

  electric resistance heaters · CPC title