Recycle hydrocracking process for converting heavy oils to middle distillates
Abstract
Abstract HEAVEY MINERAL OILS BOILING MAINLY IN THE 700-1000*F. RANGE ARE SELECTIVELY CONVERTED TO MIDDLE DISTILLATED BOILING IN THE 300-700*F. RANGE WITH A MINIMUM PRODUCTION OF LIGHTER HYDROCARBONS, BY CONTACTING THE FEED UNDER HYDROCRACKING CONDITIONS FIRST WITH A RELATIVELY NONACIDIC, HYDROFINING TYPE CATALYST SUPPORTED ON A SUBSTANTIALLY NONCRACKIG REFRACTORY OXIDE CARRIER, AND THEN WITH AN ACIDIC, ZEOLITE HYDROCRACKING CATALYST. UNCONVERTED OIL FROM THE SECOND CONTACTING ZONE IS RECYCLED TO THE FIRST ZONE. MOST OF THE DESIRED CONVERSION IS EFFECTED IN THE FIRST CONTACTING ZONE, WHILE THE SECOND ZONE IS UTILIZED TO EFFECT A MINOR ADDITIONAL CONVERSION TO DESIRED PRODUCT, AND TO HYDROCRACK (AND THUS PREVENT THEIR BUILDUP IN THE RECYCLE OIL) HEAVY, FUSED-RING POLYCYCLIC AROMATICS SUCH AS COROMENES AND OVALENES.
Inventors
- 👤 Frederick C Wood
- 👤 Cloyd P Reeg
- 👤 Arnold E Kelley
- 👤 George D Cheadle
Bibliographic Details
Claims Analysis
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| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |