US4333822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating waste engine oils
Assignee: SLOVENSKA VYSOKA SKOLA TECHNICKA BRATISLAVA
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Filing: 1980-11-10
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Granted: 1982-06-08
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Expires: 2000-11-10
Abstract
Abstract A method for the continuous decomposition of stable carbon dispersions in waste engine oils, the decomposition being immediately followed by an oil re-refining step as, preferably, a short-path distillation. In accordance with the invention, waste oil is heated, under a pressure ranging from 1 to 100 Pa, in the form of a thin film (0.1 to 2 mm thickness) to a temperature of 200 DEG -300 DEG C., whereby liberated vapors together with entrained microdrops condense at a temperature of 20 DEG -100 DEG C. Thereupon the condensate is immediately subjected to a short-path distillation to be re-refined. The entire process is advantageously effected in a single apparatus.
Inventors
- 👤 Alexander Tkac
- 👤 Jan Cvengros
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:30
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/12; C; C10; C10M; C10M175/00; C10M175/0025
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
90 words
A method of treating waste engine oils before the re-refining thereof after the removal of water and easily volatile components therefrom, comprising heating waste engine oil under a pressure ranging from 1 to 100 Pa in the form of a thin scraped film having a thickness of from 0.1 to 2 mm to a temperature of from 200° to 300° C., condensing liberated vapors together with tornoff micro-drops at a temperature of from 20° to 100° C., and immediately subjecting the condensate to a short-path distillation whereby it is refined.
Claim 2
Independent Claim
90 words
A method of treating waste engine oils before the re-refining thereof after the removal of water and easily volatile components therefrom, comprising heating waste engine oil under a pressure ranging from 1 to 100 Pa in the form of a thin scraped film having a thickness of from 0.1 to 2 mm to a temperature of from 200° to 300° C., condensing liberated vapors together with tornoff micro-drops at a temperature of from 20° to 100° C., and immediately subjecting the condensate to a short-path distillation whereby it is refined.
Claim 3
Dependent Claim
57 words
A method according to claim 1, wherein the waste engine oil, in order to remove water and easily volatile components therefrom, is heated to a temperature of from 120° to 150° C. under atmospheric pressure whereupon, in the form of a thin scraped film, it is finally heated to a temperature of from 150° to 180° C.
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) | 1985-06-07 | 1985-12-07 | 1986-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-07 | 1989-12-07 | 1990-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-07 | 1993-12-07 | 1994-06-08 | $7700.00 | Window Closed / Lapsed |