Claims
- 1. A method for the preparation of 1,1,1,2-tetrafluoroethane which comprises contacting 1,1,2,2-tetrafluoroethane with a fluorination catalyst comprising chromia at a temperature of 350 to 500.degree. C. and in the presence of an inert gas diluent for a time between about 1 and about 50 seconds to effect isomerisation to give 1,1,1,2-tetrafluoroethane with a minimum of by-product formation.
- 2. A method according to claim 1 wherein the catalyst comprises pre-fluorinated chromia.
- 3. A method according to claim 1 wherein the temperature is in the range from 400.degree. to 450.degree. C.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8824571 |
Oct 1988 |
GBX |
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Parent Case Info
This is a continuation of U.S. application No. 07/424,108, filed Oct. 20, 1989, now U.S. Pat. No. 4,950,815.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
2959624 |
Scherer et al. |
Nov 1960 |
|
4902838 |
Manzer et al. |
Feb 1990 |
|
4950815 |
Moore et al. |
Aug 1990 |
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
1039503 |
Sep 1958 |
DEX |
121710 |
Oct 1978 |
JPX |
Non-Patent Literature Citations (1)
Entry |
Miller et al., "J. Am. Chem. Soc.", vol. 72 (1950), pp. 705-707. |
Continuations (1)
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Number |
Date |
Country |
Parent |
424108 |
Oct 1989 |
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