Multizone hydrocracking process
Abstract
Abstract A MULTIZONE HYDROCRACKING PROCESS INWHICH THE FIRST CATALYTIC ZONE COMPRISES A CONVENTIONAL ACID-TYPE HYDROCRACKING CATALYST, THE SECOND CATALYTIC ZONE COMPRISES A DENITROGENATION CATALYST AND THE THIRD CATALYTIC ZONE COMPRISES A MOLECULAR SIEVE-TYPE HYDROCRACKING CATALYST. THE FRESH FEED, INCLUDING BOTH HYDROCARBON AND HYDROGEN, IS INTRODUCED INTO THE SECOND ZONE WHERE THE HYDROCARBON IS DENITROGENATED AND SENT TO THE THIRD ZONE WHERE THE HYDROCARBON IS PARTIALLY HYDROCRACKED. LIQUID PRODUCT FROM THE THIRD ZONE IS DIVIDED INTO A HIGH BOILING FRACTION AND A LOW BOILING FRACTION, AND THE HIGH BOILING FRACTION IS RECYCLED TO THE FIRST ZONE FOR FURTHER HYDROCRACKING. THE EFFLUENT FROM THE FIRST ZONE CONTINUES ON AND IS MIXED WITH THE FRESH FEED IN THE SECOND ZONE. GASEOUS EFFLUENT FROM THE THIRD ZONE IS RECYLCED TO THE FIRST, SECOND AND/OR THIRD ZONES WHERE IT PROVIDES NECESSARY HYDROGEN GAS AND AIDS IN CONTROLLING CATALYST TEMPERATURES. THE LOW BOILING LIQUID FRACTION IS RECOVERED AS PRODUCT.
Inventors
- 👤 James C Koller
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |