# US 11,028,027 B2 · Process for producing 2-chloro-3,3,3-trifluoropropene

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- Number: US 11,028,027 B2
- Document ID: US11028027B2
- Status: Granted
- Kind: B2
- Application number: 16/976,520
- Filed: 2019-03-04
- Published: 2021-01-07
- Granted: 2021-06-08
- Earliest claimed: 2018-03-07
- Assignees: Arkema France
- Applicants: Arkema France
- Inventors: Laurent Wendlinger; Dominique Deur-Bert; Anne Pigamo
- Web page: https://patentgrep.com/patent/US11028027B2

## CPC

- C07C 17/206: {the other compound being HX}
- C07C 17/20: of halogen atoms by other halogen atoms
- C07C 17/25: by splitting-off hydrogen halides from halogenated hydrocarbons
- C07C 21/18: containing fluorine
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

The present invention relates to a process for the production of 2-chloro-3,3,3-trifluoropropene comprising the stages of: a) providing a stream A comprising at least one of the compounds selected from the group consisting of 2,3-dichloro-1,1,1-trifluoropropane, 1,1,1,2,3-pentachloropropane, 1,1,2,3-tetrachloropropene and 2,3,3,3-tetrachloropropene; b) in a reactor, bringing said stream A into contact with HF in the presence or absence of a catalyst in order to produce a stream B comprising 2-chloro-3,3,3-trifluoropropene; characterized in that the electrical conductivity of said stream A provided in stage a) is less than 15 mS/cm.

## Claims

### Claim 1

A process for the production of 2-chloro-3,3,3-trifluoropropene comprising the stages of:
a) providing a stream A comprising at least one of the compounds selected from the group consisting of 2,3-dichloro-1,1,1-trifluoropropane, 1,1,1,2,3-pentachloropropane, 1,1,2,3-tetrachloropropene and 2,3,3,3-tetrachloropropene;
b) in a reactor, bringing said stream A into contact with HF in the presence or absence of a catalyst in order to produce a stream B comprising 2-chloro-3,3,3-trifluoropropene;
wherein the electrical conductivity of said stream A provided in stage a) is less than 15 mS/cm.

### Claim 2 (depends on 1)

The process as claimed in claim 1, wherein stage b) is carried out in the gas phase in the presence or absence of a catalyst.

### Claim 3 (depends on 1)

The process as claimed in claim 1, wherein stage b) is carried out in the liquid phase in the presence of a catalyst.

### Claim 4 (depends on 1)

The process as claimed in claim 1, wherein the electrical conductivity of said stream A is less than 10 mS/cm.

### Claim 5 (depends on 1)

The process as claimed in claim 1, wherein stage b) is carried out in the presence of a chromium-based catalyst.

### Claim 6 (depends on 5)

The process as claimed in claim 5, wherein the catalyst is based on chromium and also comprises a cocatalyst selected from the group consisting of Ni, Zn, Co, Mn and Mg.

### Claim 7 (depends on 1)

The process as claimed in claim 1, wherein the stream B comprises, besides 2-chloro-3,3,3-trifluoropropene, HCl, HF, 2,3,3,3-tetrafluoropropene, and optionally 2,3-dichloro-3,3-difluoropropene, 2,3,3-trichloro-3-fluoropropene and/or 1,1,1,2,2-pentafluoropropane.

### Claim 8 (depends on 1)

The process as claimed in claim 1, wherein stage b) is carried out at a temperature of between 320° C. and 440° C.

### Claim 9 (depends on 1)

The process as claimed in claim 1, wherein stage b) is carried out in the presence of hydrofluoric acid having an electrical conductivity of less than 10 mS/cm.

### Claim 10 (depends on 1)

The process as claimed in claim 1, wherein the process further comprises a step of reducing the concentration of electrolytes in stream A until the electrical conductivity of stream A is less than 15 mS/cm.