US2804487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of butadiene
Assignee: Shell Development Co
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Filing: 1954-06-29
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Granted: 1957-08-27
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Expires: 1974-06-29
Abstract
No abstract record available.
Inventors
- 👤 Lloyd R Donkle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:25
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/32; C07C5/327; C07C5/333
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
IN THE DEHYDRATION OF BUTYLENE TO BUTADIENE WITH AN ALKALINE DEHYDROGENATION CATALYST IN THE PRESSURE OF STEAM DILUENT AT A TEMPERATURE OF THE ORDER OF 600*C. BY PASSING BUTYLENE ALONG WITH STEAM UNDER THE MENTIONED CONDITIONS THROUGH A BED OF THE CATALYST IN A REACTION ZONE, THE IMPROVEMENT WHICH COMPRISES MAINTAINING THE DEPTH OF THE CATALYST BED IN THE REACTION ZONE LESS THAN 6 FEET, MAINTAINING IN THE REACTION ZONE A POSITIVE PARTIAL PRESSURE OF STEAM BELOW 0.5 ATMOSPHERE AND MAINTAINING THE TOTAL PRESSURE IN THE REACTION ZONE SUFFICIENTLY BELOW ATMOSPHERIC PRESSURE THAT THE LINEAR VELOCITY OF THE REACTION VAPORS THROUGH THE CATALY ST BED CORRESPONDS TO A MODIFIED REYNOLDS NUMBER WHICH IS AT LEAST TWICE THAT OF THE CRITICAL VELOCITY.
Claim 2
Dependent Claim
121 words
IN THE DEHYDRATION OF BUTYLENE TO BUTADIENE WITH AN ALKALINE DEHYDROGENATION CATALYST IN THE PRESSURE OF STEAM DILUENT AT A TEMPERATURE OF THE ORDER OF 600*C. BY PASSING BUTYLENE ALONG WITH STEAM UNDER THE MENTIONED CONDITIONS THROUGH A BED OF THE CATALYST IN A REACTION ZONE, THE IMPROVEMENT WHICH COMPRISES MAINTAINING THE DEPTH OF THE CATALYST BED IN THE REACTION ZONE LESS THAN 6 FEET, MAINTAINING IN THE REACTION ZONE A POSITIVE PARTIAL PRESSURE OF STEAM BELOW 0.5 ATMOSPHERE AND MAINTAINING THE TOTAL PRESSURE IN THE REACTION ZONE SUFFICIENTLY BELOW ATMOSPHERIC PRESSURE THAT THE LINEAR VELOCITY OF THE REACTION VAPORS THROUGH THE CATALY ST BED CORRESPONDS TO A MODIFIED REYNOLDS NUMBER WHICH IS AT LEAST TWICE THAT OF THE CRITICAL VELOCITY.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |