Patent US4411774A successfully refreshed from Google Patents.
US4411774A
Expired / Lapsed
US
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Process for removing contaminants from waste lubricating oil by chemical treatment
Assignee: Turbo Resources Ltd
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Filing: 1982-03-05
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Granted: 1983-10-25
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Expires: 2002-03-05
Abstract
Abstract A process is provided for removing contaminants from waste lubricating oil. The waste oil is contacted with one or more of the pretreatment chemicals ammonium sulphate, ammonium bisulphate, ammonium dihydrogen phosphate, diammonium phosphate, calcium hydrogen phosphate, phosphoric acid, calcium sulphate, aluminum sulphate, and magnesium sulphate. The contacting step is performed at a temperature of at least about 650° F. The oil mixture is then filtered to remove the contaminants. The pretreatment chemical is preferably added in the absence of water, thereby reducing the amount of water to be removed from the oil.
Inventors
- 👤 Conrad B. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:43
CPC Classifications
C; C10; C10M; C10M175/00; C10M175/0016
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
110 words
A process for removing contaminants from waste lubricating oil, said contaminants arising from detergent dispersant agents and the wear of mechanical parts, comprising the steps of: contacting the waste lubricating oil in the absence of added water with a pretreatment chemical selected from the group consisting of ammonium sulphate, ammonium bisulphate, ammonium dihydrogen phosphate, phosphoric acid, calcium sulphate, aluminum sulphate, magnesium sulphate, sodium sulphate and mixtures thereof, at a temperature in the range of about 650° F. to 725° F. for a time sufficient to render the greatest part of the contaminants removable by filtration; and then filtering the oil mixture to obtain a filtrate product reduced in contaminant content.
Claim 2
Dependent Claim
110 words
A process for removing contaminants from waste lubricating oil, said contaminants arising from detergent dispersant agents and the wear of mechanical parts, comprising the steps of: contacting the waste lubricating oil in the absence of added water with a pretreatment chemical selected from the group consisting of ammonium sulphate, ammonium bisulphate, ammonium dihydrogen phosphate, phosphoric acid, calcium sulphate, aluminum sulphate, magnesium sulphate, sodium sulphate and mixtures thereof, at a temperature in the range of about 650° F. to 725° F. for a time sufficient to render the greatest part of the contaminants removable by filtration; and then filtering the oil mixture to obtain a filtrate product reduced in contaminant content.
Claim 3
Dependent Claim
19 words
The process as set forth in claim 1, which further comprises: removing light ends simultaneously with the contacting step.
Claim 4
Dependent Claim
26 words
The process as set forth in claim 2, wherein: the filtration step is performed at a temperature in the range of about 200° to 350° F.
Claim 5
Dependent Claim
50 words
The process as set forth in claim 1, wherein: the pretreatment chemical is selected from the group consisting of ammonium sulphate, ammonium bisulphate, ammonium dihydrogen phosphate, diammonium monohydrogen phosphate, phosphoric acid, calcium hydrogen phosphate, magnesium sulphate and mixtures thereof, and is included in an amount greater than about 0.5% wt/vol.
Claim 6
Dependent Claim
39 words
The process as set forth in claim 1, wherein: the pretreatment chemical is selected from the group consisting of calcium sulphate, aluminum sulphate, sodium sulphate, and mixtures thereof, and is included in an amount greater than about 4.0% wt/vol.
Claim 7
Dependent Claim
61 words
The process as set forth in claim 1, wherein: the pretreatment chemical includes one or more of ammonium sulphate, ammonium bisulphate, ammonium dihydrogen phosphate, diammonium phosphate, magnesium sulphate and phosphoric acid included in an amount less than about 0.5% wt/vol, and one or more of calcium sulphate, aluminum sulphate, and sodium sulphate included in an amount greater than about 2.0% wt/vol.
References Cited (Backward Citations)
US1523547A
Cited
US1828429A
Cited
US2919245A
Cited
GB1006888A
Cited
GB1192541A
Cited
US3459658A
Cited
US3622505A
Cited
US3879282A
Cited
US3930988A
Cited
US4033859A
Cited
US4151072A
Cited
US4250021A
Cited
US4204946A
Cited
US4247389A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |