Patent US5766153A successfully refreshed from Google Patents.
US3769358A
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US
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Hydrogenation process start-up method
Assignee: Monsanto Co
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Filing: 1972-03-27
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Granted: 1973-10-30
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Expires: 1992-03-27
Abstract
Abstract A START-UP METHOD FOR PROCESS FOR THE LIQUID PHASE SELECTIVE NON-DESTRUCTIVE CATALYTIC HYDROGENATION OF AMETHYLSTYRENE IN A MIXED A-METHYLSTYRENE AND CUMENE FEED WHEREIN UPON THE INITIAL CHARGING OF HYDROGEN AND A-METHYLSTYRENE TO THE HYDROGENATION ZONE CONTAINING A SOLID HYDROGENATION CATALYST THE CONCENTRATION OF HYDROGEN IN THE GASES IN SAID ZONE IS MAINTAINED AT NOT GREATER THAN 40 MOLE PERCENT AND THE INLET TEMPERATURE OF THE MIXED FEEDSTEAM IS MAINTAINED AT NOT GREATER THAN 160* F. UNTIL THE HYDROGENATION REACTION HAS COMMENCED.
Inventors
- 👤 T Neta
- 👤 D Hill
- 👤 R Wiesenborn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:36
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/02; C07C5/03; C07C2523/00; C07C2523/70; C07C2523/74; C07C2523/75; C07C2523/755; Y; Y10; Y10S; Y10S585/00; Y10S585/949; Y10S585/951
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |