Production of lubricating oils
Abstract
Abstract A WHOLLY CATALYTIC ROUTE FOR THE PRODUCTION OF LUBRICATING OILS FOR PETROLEUM FEEDSTOCKS BOILING ABOVE 350*C. COMPRISES THE STEPS OF VI IMPROVEMENT OVER A CATALYST OF A GROUP VIA AND/OR GROUP VIII METAL ON A REFRACTORY OXIDE SUPPORT AND CATALYTIC DEWAXING OVER A CATALYST OF A GROUP VIA AND/OR GROUP VIII METAL ON LOW ALKALI METAL CONTENT MORDENITE. THE STEPS MAY BE IN EITHER ORDER BUT THE VI IMPROVEMENT STEP IS PREFERABLY FIRST. THE VI IMPROVEMENT STEP IS AT 650-850*F. AND 1000-3000 P.S.I.G. USING PREFERABLY, CO-MO OR SILICA ALUMINA AND THE CATALYTIC DEWAXING STEP IS AT 450-950* F. AND 100-3000 P.S.I.G. USING, PREFERABLY, PT ON DECATIONISED MORDENITE HAVING A SIO2;AL2O3 RATIO OF 14:1-50:1. DEPENDING ON THE FEEDSTOCK TO AND THE SEVERITY OF THE VI IMPROVEMENT STEP, LUBRICATING OIL PRODUCT FRACTIONS OF EITHER HIGH (75-100) OR SUPER HIGH (100-140) VI MAY BE PRODUCED.
Inventors
- 👤 Robert Neil Bennett
- 👤 Richard Nigel Parker
- 👤 Bernard Whiting Burbidge
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |