# US 12,110,260 B2 · Production method of 1,2-difluoroethylene

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- Number: US 12,110,260 B2
- Document ID: US12110260B2
- Status: Granted
- Kind: B2
- Application number: 17/294,921
- Filed: 2019-11-19
- Published: 2022-01-20
- Granted: 2024-10-08
- Earliest claimed: 2018-11-20
- Assignees: Daikin Industries, Ltd.
- Applicants: Daikin Industries, Ltd.
- Inventors: Tsubasa Nakaue
- Web page: https://patentgrep.com/patent/US12110260B2

## CPC

- C07C 17/25: by splitting-off hydrogen halides from halogenated hydrocarbons
- C07C 17/04: to unsaturated halogenated hydrocarbons
- C07C 17/10: of hydrogen atoms (combined with addition of halogens to unsaturated hydrocarbons C07C17/06)
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

Provided is a method for producing 1,2-difluoroethylene, the method being capable of producing 1,2-difluoroethylene with high selectivity. The method for producing 1,2-difluoroethylene according to the present disclosure comprises performing a dehydrochlorination reaction of 1-chloro-1,2-difluoroethane in the presence or absence of a catalyst. The dehydrochlorination reaction is a gas phase reaction or a liquid phase reaction. The production method according to the present disclosure is capable of producing 1,2-difluoroethylene with high selectivity.

## Claims

### Claim 1

A method for producing 1,2-difluoroethylene, comprising performing a dehydrochlorination reaction of 1-chloro-1,2-difluoroethane in the presence of a catalyst,
wherein the 1,2-difluoroethylene represents a mixture of an E-form and Z-form of 1,2-difluoroethylene,
wherein the dehydrochlorination reaction is a gas phase reaction performed at a reaction temperature of 200-1,000° C.,
wherein the dehydrochlorination of the 1-chloro-1,2-difluoroethane is performed while introducing the 1-chloro-1,2-difluoroethane from an inlet of a reactor,
wherein a contact time represented by a ratio W/F0 of the amount of the catalyst packed in the reactor W(g) to a flow rate of the 1-chloro-1,2-difluoroethane introduced into the reactor F0 is 3 to 150 g·sec/mL, and
wherein the catalyst is soda lime.

### Claim 2 (depends on 1)

The production method according to claim 1, comprising producing the 1-chloro-1,2-difluoroethane by a fluorination reaction of vinyl chloride.

### Claim 3 (depends on 1)

The production method according to claim 1, comprising producing the 1-chloro-1,2-difluoroethane by a chlorination reaction of 1,2-difluoroethane.