US4265733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
De-ashing lubricating oils
Assignee: Phillips Petroleum Co
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Filing: 1979-11-01
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Granted: 1981-05-05
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Expires: 1999-11-01
Abstract
Abstract In a process for reducing the concentration of ash-forming components in a lubricating oil wherein a feedstream comprising said lubricating oil and an aqueous ammonium salt treating agent is continuously passed into a first reaction zone wherein said treating agent reacts with ash-forming components in said oil and an effluent is continuously withdrawn from said first reaction zone and subjected to filtration after removal of water therefrom, the improvement comprising introducing said feedstream into said first reaction zone by passing said feestream through a centrifugal pump along with portions of the contents of said first reaction zone.
Inventors
- 👤 Donald C. Tabler
- 👤 Bobby G. Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:14
CPC Classifications
C; C10; C10M; C10M175/00; C10M175/0016; C10G; C10G2400/00; C10G2400/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
98 words
In a process for reducing the concentration of ash-forming components in a used lubricating oil wherein a feedstream comprising said lubricating oil and an aqueous ammonium salt treating agent is continuously passed into a first reaction zone wherein said treating agent reacts with ash-forming components in said oil and an effluent is continuously withdrawn from said first reaction zone and subjected to filtration after removal of water therefrom, the improvement comprising introducing said feedstream into said first reaction zone by passing said feedstream through a centrifugal pump along with portions of the contents of said first reaction zone.
Claim 2
Dependent Claim
98 words
In a process for reducing the concentration of ash-forming components in a used lubricating oil wherein a feedstream comprising said lubricating oil and an aqueous ammonium salt treating agent is continuously passed into a first reaction zone wherein said treating agent reacts with ash-forming components in said oil and an effluent is continuously withdrawn from said first reaction zone and subjected to filtration after removal of water therefrom, the improvement comprising introducing said feedstream into said first reaction zone by passing said feedstream through a centrifugal pump along with portions of the contents of said first reaction zone.
Claim 3
Dependent Claim
35 words
A process according to claim 1 wherein said ammonium salt is selected frm at least one salt of the group consisting of ammonium sulfate, ammonium bisulfate, ammonium phosphate, diammonium hydrogen phosphate, and ammonium dihydrogen phosphate.
Claim 4
Dependent Claim
44 words
A process according to claim 2 wherein the concentration of ammonium salt in said aqueous solution of a treating agent is in the range of 30 to 95 weight percent of that in an aqueous solution at 25° C. saturated with the treating agent.
Claim 5
Dependent Claim
34 words
A process according to claim 3 wherein said treating agent is present in an amount such that the ratio of treating agent to used lubricating oil is in the range of 0.002:1 to 0.05:1.
Claim 6
Dependent Claim
48 words
A process according to claim 4 wherein said lubricating oil and said treating agent are contacted in said reaction zone at a temperature in the range of about 60° to about 120° C. for a period of time in the range of about 10 to about 120 minutes.
Claim 7
Dependent Claim
14 words
A process according to claim 5 wherein said treating agent comprises diammonium hydrogen phosphate.
Claim 8
Dependent Claim
69 words
A process according to claim 6 wherein the filtered oil is subjected to additional processing comprising (1) hydrotreating said oil with hydrogen and a hydrotreating catalyst under conditions of temperature and pressure and time to produce a hydrotreated oil stock substantially free of organic heteroatom compounds, (2) stripping the hydrotreated oil stock to remove light compounds boiling below the desired lubricating oil, and (3) recovering the resulting stripped oil.
Claim 9
Dependent Claim
69 words
A process according to claim 2 wherein the filtered oil is subjected to additional processing comprising (1) hydrotreating said oil with hydrogen and a hydrotreating catalyst under conditions of temperature and pressure and time to produce a hydrotreated oil stock substantially free of organic heteroatom compounds, (2) stripping the hydrotreated oil stock to remove light compounds boiling below the desired lubricating oil, and (3) recovering the resulting stripped oil.
References Cited (Backward Citations)
US2545806A
Cited
US2771882A
Cited
US2963525A
Cited
US3173859A
Cited
US3625881A
Cited
US3791965A
Cited
US3879282A
Cited
US3923644A
Cited
US3930988A
Cited
US4151072A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-04 | 1984-11-03 | 1985-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-04 | 1988-11-03 | 1989-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-04 | 1992-11-03 | 1993-05-05 | $7700.00 | Window Closed / Lapsed |