# US 5,347,059 A · Process for preparing 1,1-dichloro-1,3,3,3-tetra-fluoropropane

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- Number: US 5,347,059 A
- Document ID: US5347059A
- Status: Granted
- Kind: A
- Application number: 08/182,365
- Filed: 1994-01-18
- Granted: 1994-09-13
- Earliest claimed: 1991-07-10
- Assignees: Solvay (Societe Anonyme)
- Inventors: Pascal Pennetreau; Francine Janssens; Pierre Barthelemy
- Web page: https://patentgrep.com/patent/US5347059A

## CPC

- C07C 17/206: {the other compound being HX}
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

The invention relates to a process for preparing 1,1-dichloro-1,3,3,3-tetrafluoropropane by reacting, in the liquid phase, 1,1,1,3,3,3-hexachloropropane with hydrogen fluoride, in the presence of a catalyst.

## Claims

### Claim 1

A process for preparing 1,1-dichloro-1,3,3,3-tetrafluoropropane, comprising:
reacting 1,1,1,3,3,3-hexachloropropane in the liquid phase with hydrogen fluoride, in a mole ratio of hydrogen fluoride to 1,1,1,3,3,3-hexachloropropane of at least 4 and not exceed more than 20, at a reaction temperature of at least about 100.degree. C. and not more than about 150.degree. C., and in the presence of a tin tetrachloride catalyst to produce 1,1-dichloro-1,3,3,3-tetrafluoropropane; and
recovering said 1,1-dichloro-1,3,3,3-tetrafluoropropane.

### Claim 2 (depends on 1)

The process according to claim 1, wherein the tin tetrachloride catalyst is used in a ratio of 0.005 to 0.1 mol of catalyst per mol of 1,1,1,3,3,3-hexachloropropane.

### Claim 3 (depends on 1)

The process according to claim 1, wherein the mole ratio of hydrogen fluoride to the 1,1,1,3,3,3-hexachloropropane used is at least 6 and does not exceed 17.

### Claim 4 (depends on 1)

The process according to claim 1, wherein the reaction is carried out at a pressure of at least 2 bar and not more than 50 bar.

### Claim 5 (depends on 4)

The process according to claim 4, wherein the pressure at which the reaction is carried out is at least 10 bar.

### Claim 6 (depends on 1)

The process according to claim 1, wherein the catalyst is used in a ratio of about 0.02 to 0.06 mol of catalyst per mol of 1,1,1,3,3,3-hexachloropropane.

### Claim 7 (depends on 1)

The process according to claim 1, wherein a mole ratio of hydrogen fluoride to 1,1,1,3,3,3-hexachloropropane used is at least 8 and does not exceed 17.

### Claim 8 (depends on 1)

The process according to claim 1, wherein the reaction is carried out at a pressure of at least 20 bar and not more than 30 bar.