Claims
- 1. A process for preparing a perfluoro-4-methyl-2-pentene having a content of perfluoro-2-methyl-2-pentene of below 1000 ppm, which comprises:
- treating a starting material comprising a major amount of perfluoro-4-methyl-2-pentene and a minor amount of perfluoro-2-methyl-2-pentene, said minor amount being greater than 1000 ppm, with a lower alkanol and a catalytic amount of a base, and removing any compound or compounds, higher boiling than perfluoro-2-methyl-2-pentene, formed from said perfluoro-2-methyl-2-pentene as a result of said treatment.
- 2. The process as claimed in claim 1, wherein the amount of lower alcohol is stoichiometrically in excess with respect to said minor amount of perfluoro-2-methyl-2-pentene.
- 3. The process as claimed in claim 1, wherein the said lower alkanol has from 1 to 3 carbon atoms.
- 4. The process as claimed in claim 1, wherein the treatment with the lower alkanol is carried out at a temperature of from 0.degree. to 35.degree. C.
- 5. The process as claimed in claim 1, wherein the base is a tertiary amine.
- 6. The process as claimed in claim 1, wherein the treatment is carried out over a period of up to 3 hours.
- 7. The process as claimed in claim 1, comprising:
- mixing said starting material with said lower alkanol in the presence of said base, thereby forming a mixture having a plurality of liquid phases,
- providing intimate contact between said liquid phases until the perfluoro-2-methyl-2-pentene is substantially converted into a compound having a higher boiling point than perfluoro-2-methyl-2-pentene, and
- separating the perfluoro-4-methyl-2-pentene from said lower alkanol and a said compound having a higher boiling point, thereby recovering perfluoro-4-methyl-2-pentene having a content of less than 1000 ppm of perfluoro-2-methyl-2-pentene.
Priority Claims (1)
Number |
Date |
Country |
Kind |
42 41 969.7 |
Dec 1992 |
DEX |
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Parent Case Info
This application is a divisional of Ser. No. 08/166,140 filed Dec. 10, 1993 now abandoned.
US Referenced Citations (8)
Foreign Referenced Citations (5)
Number |
Date |
Country |
668929 |
Aug 1963 |
CAX |
2068128 |
Nov 1992 |
CAX |
0367256 |
May 1990 |
EPX |
0512502 |
Nov 1992 |
EPX |
615057 |
Jul 1978 |
SUX |
Non-Patent Literature Citations (2)
Entry |
Chemical Abstracts, vol. 83, No. 19, Nov. 10, 1975, Columbus Ohio (abstract No. 163550). |
Chemische Berichte, Bd. 106, Nr. 9, 1973 pp. 2850-2959, Sigmar P. V. Halasz et al. |
Divisions (1)
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Number |
Date |
Country |
Parent |
166140 |
Dec 1993 |
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