US3799868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Riser-reactor system providing improved fluidized catalyst contacting
Assignee: Universal Oil Products Co
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Filing: 1971-10-28
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Granted: 1974-03-26
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Expires: 1991-10-28
Abstract
Abstract A LOWER QUANTITY OF CATALYST TO BE HANDLED BY A REGENERATOR. A DILUTE PHASE RISER-REACTOR SYSTEM WITH AN AXIAL CORE MEMBER THERETHROUGH PROVIDES AN ELONGATED UPWARDLY FLOWING ANNULAR-SHAPED COLUMN OF CATALYST REACTANT MIXTURE. THE ELIMINATION OF A CENTRAL PORTION OF A LARGE RISERREACTOR ALSO ELIMATES THE USUAL ZONE OF LOW CONCENTRATION OF PARTICLES AND THUS ENHANCES THE FLUIDIZED CONTACTING OPERATION. A MODIFIED CONSTRUSTION AND ARRANGEMENT UTILIZING A CENTRAL CORE MEMBER AS A DIP-LEG-FOR THE RECIRCULATION OF CATALYST HAS THE ADVANTAGE OF PROVIDING FOR A HIGH CATALYST TO OIL RATIO IN THE RISER-REACTION ZONE AND
Inventors
- 👤 J Gantt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:03
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |