Process for re-refining used petroleum products
Abstract
Abstract AN ECOLOGICALLY CLEAN PROCESS FOR RECOVERING A VALUABLE LIGHTLY HYDROCARBON FUEL, ONE OR MORE LUBE STOCKS AND AN ASPHALT-LIKE RESIDUE, IS DESCRIBED IN WHICH THE RAW FEED STOCK CONSISTING OF ACCUMULATED USED PETROLEUM PRODUCTS IS FIRST HEATED BY INDIRECT HEAT EXCHANGE IN THE PROCESS ITSELT AND THEN SUBJECTED TO A FIRST STAGE STRIPPING OPERATION AT ATMOSPHERIC PRESSURE AND A TEMPERATURE IN THE RANGE FROM ABOUT 300 TO 450*F. TO REMOVE THE LIGHT HYDROCARBON, WATER AND VOLATILE CONATMINANTS AS AN OVERHEAD AND LEAVING A FIRST BOTTOMS, HEATING THE FIRST BOTTOMS FURTHER AND SUBJECTING IT TO ONE ORE MORE ADDITION FLASH DISTILLA- TIONS AT A PRESSURE IN THE RANGE FROM ABOUT 1 TO 40 TORR (MM. HG ABSOLUTE) AT A TEMPERATURE IN THE RANGE FROM ABOUT 590 TO ABOUT 750*F. TO SEPARATE ONE OR MORE LUBR OIL PRODUCTS AND LEAVE AN ASPHALT-LIKE RESIDUE. THE LIGHT HYDROCARBON PRODUCT MAU BE USED IN THE PROCESS AS FUEL OR SOLD. THE STRIPPED CONTAMINATED WATER IS RECYCLED FOR COOLING PRUPOSES AND EITHER PERIODICALLY INCINERATED, OR A BLEED STREAM IS TAKEN OFF AND CONTINOUSLY INCINERATED TO CONVERT THE CONTAMINANTS TO INNOCOUS FLUE GASES.
Inventors
- 👤 O Fitzsimons
- 👤 C Radden
- 👤 G Hindman
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |