Method for producing fluoroethylene

1 . A production method,

wherein the method is for producing (Z)- and/or (E)-1,2-difluoroethylene (HFO-1132 (Z/E)), and comprises reacting 1,1,2,2-tetrafluoroethane (HFC-134) with hydrogen (H 2 ),

wherein the reaction is performed in the absence of catalyst, or in the presence of catalyst,

in the case of presence of catalyst:

the catalyst is at least one catalyst selected from the group consisting of activated carbon, a metal catalyst, and a metal catalyst supported on a carrier,

the metal catalyst is at least one metal catalyst selected from the group consisting of chromium oxide, fluorinated chromium oxide, chromium fluoride, copper chromium oxide, fluorinated copper chromium oxide, aluminum oxide, fluorinated aluminum oxide, aluminum fluoride, iron oxide, fluorinated iron oxide, iron fluoride, nickel oxide, fluorinated nickel oxide, nickel fluoride, copper oxide, fluorinated copper oxide, magnesium oxide, fluorinated magnesium oxide, and magnesium fluoride,

the carrier supporting the metal catalyst is at least one carrier selected from the group consisting of carbon, alumina, zirconia, silica, and titania, the carbon is at least one carbon selected from the group consisting of activated carbon, amorphous carbon, graphite, and diamond.

2 . The production method according to claim 1 , comprising,

after the reaction,

collecting HFO-1132 (Z/E) from a reaction product, and

separating a stream mainly comprising HFC-134 and a stream mainly comprising hydrogen fluoride (HF) generated after the reaction; and

recycling at least part of the stream mainly comprising HFC-134 to the reaction to react with hydrogen (H 2 ) again.

3 . A production method,

wherein the method is for producing 1,1-difluoroethylene (HFO-1132a), and comprises reacting 1,1,1,2-tetrafluoroethane (HFC-134a) with hydrogen (H 2 ).

4 . The production method according to claim 3 , comprising,

after the reaction,

collecting HFO-1132a from a reaction product, and

separating a stream mainly comprising HFC-134a and a stream mainly comprising hydrogen fluoride (HF) generated after the reaction; and

recycling at least part of the stream mainly comprising HFC-134a to the reaction to react with hydrogen (H 2 ) again.

5 . The production method according to claim 1 , wherein the reaction is performed in a gas-phase flow process.

6 . The production method according to claim 1 , wherein the reaction is performed at a temperature of 400° C. or more.

7 . The production method according to claim 1 , wherein the reaction is performed in such a manner that the hydrogen (H 2 ) is used in an amount of 0.1 to 10 mol per mol of a raw material compound (molar ratio of H 2 /raw material compound).

8 . The production method according to claim 3 , wherein the reaction is performed using a metal catalyst.

9 . The production method according to claim 8 , wherein the metal catalyst is at least one metal catalyst selected from the group consisting of chromium oxide, fluorinated chromium oxide, chromium fluoride, copper chromium oxide, fluorinated copper chromium oxide, aluminum oxide, fluorinated aluminum oxide, aluminum fluoride, iron oxide, fluorinated iron oxide, iron fluoride, nickel oxide, fluorinated nickel oxide, nickel fluoride, copper oxide, fluorinated copper oxide, magnesium oxide, fluorinated magnesium oxide, and magnesium fluoride.

10 . The production method according to claim 3 , wherein the reaction is performed in a gas-phase flow process.

11 . The production method according to claim 3 , wherein the reaction is performed at a temperature of 400° C. or more.

12 . The production method according to claim 3 , wherein the reaction is performed in such a manner that the hydrogen (H 2 ) is used in an amount of 0.1 to 10 mol per mol of a raw material compound (molar ratio of H 2 /raw material compound).