US3658877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for prevention of catalyst hang-up in ammoxidation of olefins to unsaturated nitriles
Assignee: Standard Oil Co
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Filing: 1970-07-13
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Granted: 1972-04-25
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Expires: 1990-07-13
Abstract
Abstract STEAM IS USED KEEP THE QUIESCENT ZONE ABOUT 200*F. COOLER THAN THE TURBULENT ZONE OF A FLUID-BED REACTOR UTILIZED IN THE AMMOXIDATION OF MONOOLEFINS TO UNSATURATED NITRIELS. STEAM ESCAPING FROM THE QUIESCENT ZONE INTO THE TURBULEN ZONE PREVENTS FUSION OF POWDERY CATALYST IN THE PRESENCE OF OXYGEN AND THE ADHESION OF FUSED CATALYST TO INTERNALS IN THE TOP PORTION OF THE REACTOR.
Inventors
- 👤 James L Callahan
- 👤 Robert D Presson
- 👤 Arthur F Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:12
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/24; C07C253/26; B; B01; B01J; B01J8/00; B01J8/005; Y; Y10; Y10S; Y10S585/00; Y10S585/919; Y10S585/921; Y10S585/922; Y10S585/924; Y10S585/926; Y10S585/949; Y10S585/95
Claims Analysis
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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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |