# US 10,870,613 B2 · Process for the preparation of 2,3,3,3-tetrafluoropropene

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- Number: US 10,870,613 B2
- Document ID: US10870613B2
- Status: Granted
- Kind: B2
- Application number: 16/464,901
- Filed: 2017-11-24
- Published: 2020-01-09
- Granted: 2020-12-22
- Earliest claimed: 2016-11-29
- Assignees: SRF Limited
- Applicants: SRF Limited
- Inventors: Jose George; Sunil Raj; Ambuj Mishra; Anurag Katiyar; Rajdeep Anand
- Web page: https://patentgrep.com/patent/US10870613B2

## CPC

- C07C 17/278: of only halogenated hydrocarbons
- C07C 21/18: containing fluorine
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

The present invention provides an improved process for preparation of 2,3,3,3-tetrafluoropropene, wherein recyclization of the reaction by-products result in equilibrium between feed and outlet composition.

## Claims

### Claim 1

A process for preparation of 2,3,3,3-tetrafluoropropene consisting of:
a) providing a heat source in a reactor;
b) providing a mixture of methylchloride and tetrafluoroethylene, said mixture is either premixed or added separately, in the reactor to obtain a mixture;
c) contacting the mixture with heat source in the presence of an initiator to obtain a reaction mixture comprising 2,3,3,3-tetrafluoropropene; and
d) isolating 2,3,3,3-tetrafluoropropene,
wherein, heat source is either an electric heater or a furnace,
wherein, the initiator is selected from a group consisting of carbon tetrachloride, chloroform, or a mixture thereof.

### Claim 2 (depends on 1)

The process of claim 1, wherein the initiator is added to the mixture of methylchloride and tetrafluoroethylene prior to contacting the mixture with the heat source.

### Claim 3 (depends on 1)

The process of claim 1, wherein the initiator is added to the mixture of methylchloride and tetrafluoroethylene after contacting the mixture with the heat source.

### Claim 4 (depends on 1)

The process of claim 1, wherein the reactor is a continuous or batch reactor.

### Claim 5 (depends on 1)

The process of claim 1, wherein the mole ratio of methyl chloride to tetrafluoroethylene is selected from 0.1 to 3:1.

### Claim 6 (depends on 1)

The process of claim 1, wherein the reactor is heated to a temperature in range of 250° C. to 700° C. or the reaction mixture is heated to a temperature in the range of 250° C. to 700° C. in the reactor, or both.