US4585567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of fluorinated lubricants free from hydrogen
Assignee: Montefluos SpA
•
Filing: 1985-03-15
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Granted: 1986-04-29
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Expires: 2005-03-15
Abstract
Abstract There is proposed a process for the purification of fluorinated lubricants, free from hydrogen, such as perfluorinated ethers or chlorofluorocarbons, whose elimination can be dangerous for the environment owing to the fluorine release, such a process consisting in dissolving the lubricant in a fluorochlorinated hydrocarbon, then in precipitating by means of a grease solvent, in separating, in degasing and finally in filtering in order to remove the mechanical impurities.
Inventors
- 👤 Hannelore Strohbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:17
CPC Classifications
B; B01; B01D; B01D11/00; C; C08; C08F; C08F8/00; C08F8/18; C08F8/20; C08G; C08G65/00; C08G65/002; C08G65/005; C08G65/007; C08G65/02; C08G65/30; C10; C10M; C10M175/00; C10M175/0075; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/915
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
65 words
A process for the purification of fluorinated lubricants free from hydrogen, from mineral oils, characterized in that the lubricant to be purified is dissolved in a chlorofluorinated hydrocarbon, a grease solvent selected from the group consisting of gasoline, benzene, toluene and hexane is added to the resulting solution, the purified lubricant thereby precipitated is separated and is subjected to gasification for removing the residual solvent.
Claim 2
Dependent Claim
65 words
A process for the purification of fluorinated lubricants free from hydrogen, from mineral oils, characterized in that the lubricant to be purified is dissolved in a chlorofluorinated hydrocarbon, a grease solvent selected from the group consisting of gasoline, benzene, toluene and hexane is added to the resulting solution, the purified lubricant thereby precipitated is separated and is subjected to gasification for removing the residual solvent.
Claim 3
Dependent Claim
22 words
A process according to claim 1 characterized in that a filtration is additionally carried out in order to eliminate the mechanical impurities.
Claim 4
Dependent Claim
31 words
A process according to claim 2 characterized in that the filtration for the removal of the mechanical impurities is subsequent to the process steps for the removal of the hydrocarbon impurities.
Claim 5
Dependent Claim
21 words
A process according to claim 1, in which the degasification of the product to be purified is carried out under vacuum.
Claim 6
Dependent Claim
34 words
A process according to claim 4, in which the product to be purified is heated, during the vacuum degasification, to a temperature higher than the boiling temperature of the solvent of the fluorinated lubricant.
Claim 7
Dependent Claim
18 words
A process according to claim 1, in which the fluorinated lubricant to be purified is a perfluorinated ether.
Claim 8
Dependent Claim
17 words
A process according to claim 1, in which the fluorinated lubricant to be purified is a chlorofluorocarbon.
Claim 9
Dependent Claim
16 words
A process according to claim 1, in which the solvent of the fluorinated lubricant is trichlorotrifluoroethane.
Claim 10
Dependent Claim
14 words
A process according to claim 1 characterized in that, trichlorotrifluoroethane is employed as chlorofluorocarbon.
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) | 1989-04-28 | 1989-10-28 | 1990-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-28 | 1993-10-28 | 1994-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-28 | 1997-10-28 | 1998-04-29 | $7700.00 | Window Closed / Lapsed |