Hydrocracking production of lubes
Abstract
Abstract A PROCESS FOR PREVARING HIGH V.I. LUBE OILS OF IMPROVED QUALITY COMPRISING SOLVENT EXTRACTING AT LEAST PART OF THE LUBE OIL HYDROCRACKER CHARGE STOCK WITH A SOLVENT HAVING PREFERENTIAL SOLUBILITY FOR AROMATICS, FOR EXAMPLE, FURFURAL; HYDROCRACKING THE RAFFINATE FROM SAID EXTRACTION UNDER CONDITIONS PROVIDING FOR AN INCREASED V.I. OF SAID RAFFINATE. QUALITY IS FURTHER ENHANCED BY SERIALLY EXTRACTING THE HYDROCRACKED PRODUCTS WITH A SOLVENT HAVING PREFERENTIAL SOLUBILITY FOR AROMATICS, SUCH AS FURFURAL, UNDER CONDITIONS PROVIDING FOR HIGHLY SELECTIVE REMOVAL OF COLOR BODIES, COLOR BODY PRECURSORS, U.V. ADSORBING COMPOUNDS AND SLUDGE PRECURSORS. ALTERNATIVELY, THE QUALITY OF THE HYDROCRACKED PRODUCT MAY BE FURTHER ENHANCED BY SELECTIVELY HYDROGENATING SAME AT RELATIVELY SEVERE LUBE HYDROGENATION CONDITIONS WHEREBY COLOR BODIES, COLOR BODY PRECURSORS, U.V. ADSORBING COMPOUNDS AND SLUDGE PRECURSORS ARE MITIGATED. D R A W I N G
Inventors
- 👤 R Kress
Bibliographic Details
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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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |