US4366049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recycling of used lubricating oils
Assignee: Balzers und Leybold Deutschland Holding AG
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Filing: 1980-09-30
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Granted: 1982-12-28
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Expires: 2000-09-30
Abstract
Abstract The object of the invention is a process for recycling used lubricating oils. After drying and gasoline removal, the oil is distilled and then treated with sodium or sodium hydride in a finely-divided state at elevated temperature. This is followed by a further distillation. Both distillations are at temperatures below 300° C., the oil fractions of low volatility being respectively distilled in a molecular distillation apparatus at below 2 mbar.
Inventors
- 👤 Helmut Knorre
- 👤 Manfred Langer
- 👤 Friedrich Fauser
- 👤 Willi Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:56
CPC Classifications
B; B01; B01D; B01D1/00; B01D1/22; B01D1/222; C; C10; C10M; C10M175/00; C10M175/0016
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
191 words
A process for recycling used oils comprising: selecting used oil which has been dried and has had the gasoline removed, distilling said used oil at a temperature less than 300° C. to produce a distillate in a first stage, reacting said distillate with finely divided sodium metal or sodium hydride to produce a first reaction mixture, stripping said first reaction mixture with water or steam, in a first flasher, removing gas and low boiling ends in said first flasher, removing a residue from said first stage and treating said residue in at least one molecular still, at a temperature of less than 300° C. and at a pressure of less than 2 mbar, recovering crude base oil in said molecular still, contacting said crude base oil with finely divided sodium metal or sodium hydride to produce a second reaction mixture, conducting said second reaction mixture to a second flasher and injecting steam or water into said flasher to flash off volatives, recycling at least a portion of the bottoms of the said first flasher to the bottoms of the second flasher, and recovering the gas oil product from the first flasher.
Claim 2
Dependent Claim
191 words
A process for recycling used oils comprising: selecting used oil which has been dried and has had the gasoline removed, distilling said used oil at a temperature less than 300° C. to produce a distillate in a first stage, reacting said distillate with finely divided sodium metal or sodium hydride to produce a first reaction mixture, stripping said first reaction mixture with water or steam, in a first flasher, removing gas and low boiling ends in said first flasher, removing a residue from said first stage and treating said residue in at least one molecular still, at a temperature of less than 300° C. and at a pressure of less than 2 mbar, recovering crude base oil in said molecular still, contacting said crude base oil with finely divided sodium metal or sodium hydride to produce a second reaction mixture, conducting said second reaction mixture to a second flasher and injecting steam or water into said flasher to flash off volatives, recycling at least a portion of the bottoms of the said first flasher to the bottoms of the second flasher, and recovering the gas oil product from the first flasher.
Claim 3
Dependent Claim
35 words
The process as set forth in claim 1 wherein the bottoms of said second flasher are conveyed to at least one other molecular still for recovery of spindle oil, bottom oil and sodium containing residue.
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) | 1985-12-27 | 1986-06-28 | 1986-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-27 | 1990-06-28 | 1990-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-27 | 1994-06-28 | 1994-12-28 | $7700.00 | Window Closed / Lapsed |