US3887629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of fluorocarbons
Assignee: Phillips Petroleum Co
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Filing: 1973-10-01
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Granted: 1975-06-03
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Expires: 1993-10-01
Abstract
Abstract A mixture of a fluorocarbon and a corresponding hydrocarbon is subjected to liquid-liquid solvent extraction. The extraction removes substantially all of the hydrocarbon and the fluorocarbon raffinate containing a small amount of hydrocarbon, such as on the order of 2 weight percent or less, is then distilled to obtain the fluorocarbon of at least about 99 weight percent purity.
Inventors
- 👤 George B Fozzard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:25
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/38
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
60 words
A PROCESS FOR OBTAINING A HIGH PURITY PERFLUOROALKANE CONTAINING FROM 3 TO 10 CARBON ATOMS FROM A MIXTURE THEREOF WITH A CORRESPONDING ALKANE WHICH COMPRISES EXTRACTING THE MIXTURE IN A LIQUID PHASE AT A TEMPERATURE BELOW ABOUT +20* C WITH TOLUENE OR XYLENE AND SUBJECTING THE RESULTING RAFFINATE TO DISTILLATION AND RECOVERING FROM SAID DISTILLATION A PERFLUOROALKANE OF HIGH PURITY.
Claim 2
Dependent Claim
60 words
A PROCESS FOR OBTAINING A HIGH PURITY PERFLUOROALKANE CONTAINING FROM 3 TO 10 CARBON ATOMS FROM A MIXTURE THEREOF WITH A CORRESPONDING ALKANE WHICH COMPRISES EXTRACTING THE MIXTURE IN A LIQUID PHASE AT A TEMPERATURE BELOW ABOUT +20* C WITH TOLUENE OR XYLENE AND SUBJECTING THE RESULTING RAFFINATE TO DISTILLATION AND RECOVERING FROM SAID DISTILLATION A PERFLUOROALKANE OF HIGH PURITY.
Claim 3
Dependent Claim
60 words
A process for obtaining a high purity perfluoroalkane containing from 3 to 10 carbon atoms from a mixture thereof with a corresponding alkane which comprises extracting the mixture in a liquid phase at a temperature below about +20* C wiTh toluene or xylene and subjecting the resulting raffinate to distillation and recovering from said distillation a perfluoroalkane of high purity.
Claim 4
Dependent Claim
60 words
A process for obtaining a high purity perfluoroalkane containing from 3 to 10 carbon atoms from a mixture thereof with a corresponding alkane which comprises extracting the mixture in a liquid phase at a temperature below about +20* C wiTh toluene or xylene and subjecting the resulting raffinate to distillation and recovering from said distillation a perfluoroalkane of high purity.
Claim 5
Dependent Claim
18 words
A process in accordance with claim 1 wherein the perfluoroalkane is perfluoro-n-butane and the alkane is normal butane.
Claim 6
Dependent Claim
17 words
A process in accordance with claim 1 wherein the perfluoroalkane is perfluoroisobutane and the alkane is isobutane.
Claim 7
Dependent Claim
23 words
A process in accordance with claim 1 wherein the extraction is carried out at a temperature of from about -80* to -20* C.
Claim 8
Dependent Claim
17 words
A process in accordance with claim 1 wherein the perfluoroalkane is perfluoropropane and the alkane is propane.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |