US4287049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reclaiming used lubricating oils with ammonium salts and polyhydroxy compounds
Assignee: Phillips Petroleum Co
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Filing: 1980-02-05
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Granted: 1981-09-01
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Expires: 2000-02-05
Abstract
Abstract A process for the reclaiming of used lubricating oils, particularly mixtures containing used oil from diesel engine crank cases, is provided to facilitate the separation of an oil phase from residual product in the production of an intermediate low-ash oil or a high-grade lube oil stock which method comprises: (a) contacting the used oil with an aqueous ammonium salt treating agent in the presence of a polyhydroxy compound, (b) removing a major portion of water, and (c) separating the oil phase from the resultant residual product. Optionally, (d) recovering the low-ash product of step (c) for use as a fuel oil, in grease formulations, or in the preparation of lubricating oil formulations. Optionally, the low-ash product of step (d) is (e) subjected to hydrotreating and thereafter (f) stripped.
Inventors
- 👤 Donald C. Tabler
- 👤 Marvin M. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:13
CPC Classifications
C; C10; C10M; C10M175/00; C10M175/0016; F; F02; F02B; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
61 words
In a process for removing ash-forming contaminants from a used oil by contacting said contaminated oil with an aqueous solution of an ammonium salt treating agent to form a precipitate of reacted contaminants, a method for facilitating removal of the precipitate, said method comprising contacting said treating agent with ash-forming contaminants in the oil in the presence of a polyhydroxy compound.
Claim 2
Dependent Claim
61 words
In a process for removing ash-forming contaminants from a used oil by contacting said contaminated oil with an aqueous solution of an ammonium salt treating agent to form a precipitate of reacted contaminants, a method for facilitating removal of the precipitate, said method comprising contacting said treating agent with ash-forming contaminants in the oil in the presence of a polyhydroxy compound.
Claim 3
Dependent Claim
24 words
A method of claim 1 wherein said polyhydroxy compound is chosen from among the group consisting of glycerol, sugar-alcohols, mono-saccharides, di-saccharides, and ethylene glycol.
Claim 4
Dependent Claim
29 words
A method of claim 1 or 2 wherein the polyhydroxy compound is present in a concentration of about 0.1 to about 1.0 weight percent of the total oil mixture.
Claim 5
Independent Claim
81 words
A method for treating used oil comprising: (a) contacting said used oil with an aqueous solution of an ammonium salt treating agent in the presence of a polyhydroxy compound at conditions of temperature and pressure sufficient for reaction of the treating agent with ash-forming contaminants of the oil thereby producing a precipitate of reacted contaminants, (b) removing a major portion of water and light hydrocarbon components from the reaction mixture, and (c) separating an oil phase from the precipitate by filtration.
Claim 6
Independent Claim
81 words
A method for treating used oil comprising: (a) contacting said used oil with an aqueous solution of an ammonium salt treating agent in the presence of a polyhydroxy compound at conditions of temperature and pressure sufficient for reaction of the treating agent with ash-forming contaminants of the oil thereby producing a precipitate of reacted contaminants, (b) removing a major portion of water and light hydrocarbon components from the reaction mixture, and (c) separating an oil phase from the precipitate by filtration.
Claim 7
Dependent Claim
16 words
A method of claim 4 wherein said oil phase is removed from the system as product.
Claim 8
Dependent Claim
73 words
A method of claim 4 wherein said separated oil phase is subjected to further treatment comprising: (d) heating said separated oil phase to a temperature in the range of about 200° to about 480° C., (e) contacting heated, separated oil phase with an adsorbent, (f) hydrotreating the oil effluent from the contacting with adsorbent, (g) stripping the oil effluent from the hydrotreating step, and (h) recovering the resulting stripped oil as a product.
Claim 9
Dependent Claim
28 words
A method of claim 4, 5 or 6 in which the polyhydroxy compound is chosen from among the group consisting of glycerol, sugar-alcohols, mono-saccharides, di-saccharides, and ethylene glycol.
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) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |