# US 5,346,594 A · Process for the purification of 1,1-dichloro-1-fluoroethane

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- Number: US 5,346,594 A
- Document ID: US5346594A
- Status: Granted
- Kind: A
- Application number: 08/002,765
- Filed: 1993-01-12
- Granted: 1994-09-13
- Earliest claimed: 1992-01-13
- Assignees: Solvay (Societe Anonyme)
- Inventors: Paul Lechaude; Gilles Darago; Philippe Krafft; Jean-Pierre Catinat
- Web page: https://patentgrep.com/patent/US5346594A

## CPC

- C07C 17/395: by treatment giving rise to a chemical modification of at least one compound
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

A process for purification of crude, 1,1-dichloro-1-fluoroethane includes the steps of treating a mixture of crude, 1,1-dichloro-1-fluoroethane and hydrogen fluoride with chlorine in the presence of a Lewis acid, and distilling to recover purified 1,1-dichloro-1-fluoroethane, wherein hydrogen fluoride is present during the treatment with chlorine at a ratio of at least 5% by weight with respect to the mixture of crude, 1,1-dichloro-1-fluoroethane and hydrogen fluoride.

## Claims

### Claim 1

Process for purification of crude 1,1-dichloro-1-fluoroethane, comprising:
(a) treating a mixture consisting essentially of crude 1,1-dichloro-1-fluoroethane and hydrogen fluoride with chlorine at a ratio of chlorine which does not exceed 50% by weight based on the weight of the mixture of crude 1,1-dichloro-1-fluoroethane and hydrogen fluoride in the presence of a Lewis acid; and
(b) distilling to recover purified 1,1-dichloro-1-fluoroethane,
wherein hydrogen fluoride is present during the treatment with chlorine at a ratio of at least 5% by weight with respect to the mixture of crude 1,1-dichloro-1-fluoroethane and hydrogen fluoride.

### Claim 2 (depends on 1)

Process according to claim 1, wherein hydrogen fluoride is present during the treatment with chlorine at a ratio of at least 15% by weight with respect to the mixture of crude 1,1-dichloro-1-fluoroethane and hydrogen fluoride.

### Claim 3 (depends on 1)

Process according to claim 1, wherein the treatment with chlorine is carried out in the presence of less than 10 ppm of a Lewis acid with respect to the weight of crude 1,1-dichloro-1fluoroethane.

### Claim 4 (depends on 1)

Process according to claim 1, wherein the treatment with chlorine is carried out in the presence of at least 0.15 ppm of a Lewis acid with respect to the weight of crude 1,1-dichloro-1-fluoroethane.

### Claim 5 (depends on 1)

Process according to claim 1, wherein the Lewis acid is FeCl.sub.3.

### Claim 6 (depends on 1)

Process according to claim 1, wherein the treatment with chlorine is carried out in the presence of from 0.1 to 12% by weight of chlorine with respect to the weight of crude 1,1-dichloro-1-fluoroethane.

### Claim 7 (depends on 1)

Process according to claim 1, wherein the treatment with chlorine is carried out at a temperature ranging from 0.degree. and 90.degree. C.

### Claim 8 (depends on 1)

Process according to claim 1, wherein the treatment with chlorine does not exceed 30 minutes.