US2956092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of isobutene from butadiene
Assignee: Houdry Process Corp
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Filing: 1956-10-17
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Granted: 1960-10-11
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Expires: 1976-10-17
Abstract
No abstract record available.
Inventors
- 👤 Robert G Craig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:11
CPC Classifications
C; C07; C07C; C07C11/00; C07C11/12; C07C11/16; C07C11/167; C07C5/00; C07C5/32; C07C5/327; C07C5/333
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
THE METHOD OF DEHYDROGENATING BUTANE WHICH CONSISTS OF: PREPARING A MIXTURE OF A RECYCLE STREAM AND FRESH BUTANE FEED, SUBJECTING SAID MIXTURE TO DEHYDROGENATION AT AN ELEVATED TEMPERATURE IN THE PRESENCE OF A DEHYDROGENATION CATALYST TO PREPARE A CATALYTIC C4 EFFLUENT CONSISTING ESSENTIALLY OF BUTANE, CIS-BUTENE-2, TRANSBUTENE-2, ISOBUTANE, ISOBUTENE, BUTENE-1, AND BUTADIENE, SEPARATING A FRACTION CONTAINING SUBSTANTIALLY ALL OF THE BUTANE, CIS-BUTENE-2 AND TRANS-BUTENE-2 IN SAID C4 EFFLUENT FOR RECIRCULATION AS SAID RECYCLE STREAM, SAID RECYCLE STREAM BEING SUBSTANTIALLY FREE FROM ISOBUTANE AND ISOBUTENE, SEPARATING AND WITHDRAWING AS THE MOST VALUABLE PRODUCT OF THE PROCESS A STREAM OF BUTADIENE, AND SEPARATING AND WITHDRAWING AS A BY-PRODUCT OF THE PROCESS A STREAM OF BUTENE-1 CONTAINING SUBSTANTIALLY ALL OF THE ISOBUTANE AND ISOBUTENE IN SAID C4 EFFLUENT.
Claim 2
Independent Claim
125 words
THE METHOD OF DEHYDROGENATING BUTANE WHICH CONSISTS OF: PREPARING A MIXTURE OF A RECYCLE STREAM AND FRESH BUTANE FEED, SUBJECTING SAID MIXTURE TO DEHYDROGENATION AT AN ELEVATED TEMPERATURE IN THE PRESENCE OF A DEHYDROGENATION CATALYST TO PREPARE A CATALYTIC C4 EFFLUENT CONSISTING ESSENTIALLY OF BUTANE, CIS-BUTENE-2, TRANSBUTENE-2, ISOBUTANE, ISOBUTENE, BUTENE-1, AND BUTADIENE, SEPARATING A FRACTION CONTAINING SUBSTANTIALLY ALL OF THE BUTANE, CIS-BUTENE-2 AND TRANS-BUTENE-2 IN SAID C4 EFFLUENT FOR RECIRCULATION AS SAID RECYCLE STREAM, SAID RECYCLE STREAM BEING SUBSTANTIALLY FREE FROM ISOBUTANE AND ISOBUTENE, SEPARATING AND WITHDRAWING AS THE MOST VALUABLE PRODUCT OF THE PROCESS A STREAM OF BUTADIENE, AND SEPARATING AND WITHDRAWING AS A BY-PRODUCT OF THE PROCESS A STREAM OF BUTENE-1 CONTAINING SUBSTANTIALLY ALL OF THE ISOBUTANE AND ISOBUTENE IN SAID C4 EFFLUENT.
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) | 1963-10-11 | 1964-04-11 | 1964-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-11 | 1968-04-11 | 1968-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-11 | 1972-04-11 | 1972-10-11 | $7700.00 | Window Closed / Lapsed |