US3232849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Butene and butadiene purification by plural stage distillation
Assignee: Phillips Petroleum Co
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Filing: 1961-10-27
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Granted: 1966-02-01
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Expires: 1981-10-27
Abstract
No abstract record available.
Inventors
- 👤 Graham A Renberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:36
CPC Classifications
C; C07; C07C; C07C11/00; C07C11/12; C07C11/16; C07C11/167; C07C11/02; C07C11/08; C07C7/00; C07C7/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A METHOD FOR THE SEPARATION AND RECOVERY OF BUTENES AND BUTADIENE FROM A FEED STREAM COMPRISING BUTENE-1, BUTADIENE AND N-BUTANE COMPRISING EXTRACTIVELY DISTILLING SAID FEED STREAM IN THE PRESENCE OF AN EXTRACTANT COMPRISING FURFURAL, BUTENE-1, TRANS-BUTENE-2 AND CIS-BUTENE-2 THEREBY PRODUCING AN OVERHEAD PRODUCT COMPRISING BUTENE-1, N-BUTANE, TRANS-BUTENE-2 AND CIS-BUTENE-2 AS ONE PRODUCT OF THE OPERATION AND A BOTTOMS PRODUCT COMPRISING FURFURAL AND BUTADIENE WITH MINOR PROPORTIONS OF BUTENE-1 AND BUTENES-2, DISTILLING SAID BOTTOMS PRODUCT AT A SUBSTANTIALLY HIGHER TEMPERATURE THAN THAT IN THE AFORESAID DISTILLING THEREBY PRODUCING A BUTADIENE RICH VAPOROUS OVERHEAD PRODUCT AT SAID TEMPERATURE, DIVIDING THIS LATTER PRODUCT INTO TWO PORTIONS, PASSING ONE PORTION INTO THE EXTRACTIVE DISTILLATION OPERATION AS BOIL-UP MEDIUM AND REMOVING THE OTHER PORTION AS ANOTHER PRODUCT, THIS LATTER DISTILLING STEP PRODUCING A BOTTOMS PRODUCT COMPRISING FURFURAL.
Claim 2
Independent Claim
132 words
A METHOD FOR THE SEPARATION AND RECOVERY OF BUTENES AND BUTADIENE FROM A FEED STREAM COMPRISING BUTENE-1, BUTADIENE AND N-BUTANE COMPRISING EXTRACTIVELY DISTILLING SAID FEED STREAM IN THE PRESENCE OF AN EXTRACTANT COMPRISING FURFURAL, BUTENE-1, TRANS-BUTENE-2 AND CIS-BUTENE-2 THEREBY PRODUCING AN OVERHEAD PRODUCT COMPRISING BUTENE-1, N-BUTANE, TRANS-BUTENE-2 AND CIS-BUTENE-2 AS ONE PRODUCT OF THE OPERATION AND A BOTTOMS PRODUCT COMPRISING FURFURAL AND BUTADIENE WITH MINOR PROPORTIONS OF BUTENE-1 AND BUTENES-2, DISTILLING SAID BOTTOMS PRODUCT AT A SUBSTANTIALLY HIGHER TEMPERATURE THAN THAT IN THE AFORESAID DISTILLING THEREBY PRODUCING A BUTADIENE RICH VAPOROUS OVERHEAD PRODUCT AT SAID TEMPERATURE, DIVIDING THIS LATTER PRODUCT INTO TWO PORTIONS, PASSING ONE PORTION INTO THE EXTRACTIVE DISTILLATION OPERATION AS BOIL-UP MEDIUM AND REMOVING THE OTHER PORTION AS ANOTHER PRODUCT, THIS LATTER DISTILLING STEP PRODUCING A BOTTOMS PRODUCT COMPRISING FURFURAL.
References Cited (Backward Citations)
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US2750435A
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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) | 1969-01-31 | 1969-08-02 | 1970-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-31 | 1973-08-02 | 1974-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-31 | 1977-08-02 | 1978-02-01 | $7700.00 | Window Closed / Lapsed |