US2905732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of butadiene by removing it from oxygen with an absorbent oil
Assignee: Phillips Petroleum Co
•
Filing: 1955-04-04
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Granted: 1959-09-22
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Expires: 1975-04-04
Abstract
No abstract record available.
Inventors
- 👤 Sig C Fauske
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:09
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
A METHOD FOR REMOVING FREE OXYGEN FROM AN ADMIXTURE WITH BUTADIENE COMPRISING CONTACTING VAPOROUS BUTADIENE FEED STOCK CONTAINING FREE OXYGEN IMPURITY WITH AN ABSORBENT MINERAL SEAL OIL IN A VAPOR-LIQUID ABSORPTION ZONE MAINTAINED AT A SUPER-ATMOSPHERIC PRESSURE, WITHDRAWING ABSORBENT MINERAL SEAL OIL CONTAINING DISSOLVED BUTADIENE, REDUCING THE PRESSURE OF THE WITHDRAWN MINERAL SEAL OIL CONTAINING DISSOLVED BUTADIENE IN A FIRST FLASHING OPERATION, WITHDRAWING FLASHED BUTADIENE FROM SAID FIRST FLASHING OPERATION, FURTHER REDUCING THE PRESSURE ON THE ABSORBENT MINERAL SEAL OIL FROM THE FIRST FLASHING OPERATION TO A SUB-ATMOSPHERIC PRESSURE IN A SECOND FLASHING OPERATION, REMOVING FLASHED BUTASEAL OIL FROM THIS SECOND FLASHING OPERATION AND RETURNING SAME TO THE OBSORPTION OPERATION, REMOVING FLASHED BUTADIENE FROM THE SECOND FLASHING OPERATION AND COMBINING SAME WITH THE BUTADIENE FROM THE FIRST FLASHING OPERATION AND WITH THE FEED STOCK VAPOROUS BUTADIENE AT LEAST PARTIALLY CONDENSING THIS COMBINED BUTADIENE AND REMOVING BUTADIENE CONDENSATE AS THE PRODUCT OF THE PROCESS AND PASSING THE UNCONDENSED BUTADIENE TO THE ABOVE MENTION ABSORPTION OPERATION.
Claim 2
Independent Claim
164 words
A METHOD FOR REMOVING FREE OXYGEN FROM AN ADMIXTURE WITH BUTADIENE COMPRISING CONTACTING VAPOROUS BUTADIENE FEED STOCK CONTAINING FREE OXYGEN IMPURITY WITH AN ABSORBENT MINERAL SEAL OIL IN A VAPOR-LIQUID ABSORPTION ZONE MAINTAINED AT A SUPER-ATMOSPHERIC PRESSURE, WITHDRAWING ABSORBENT MINERAL SEAL OIL CONTAINING DISSOLVED BUTADIENE, REDUCING THE PRESSURE OF THE WITHDRAWN MINERAL SEAL OIL CONTAINING DISSOLVED BUTADIENE IN A FIRST FLASHING OPERATION, WITHDRAWING FLASHED BUTADIENE FROM SAID FIRST FLASHING OPERATION, FURTHER REDUCING THE PRESSURE ON THE ABSORBENT MINERAL SEAL OIL FROM THE FIRST FLASHING OPERATION TO A SUB-ATMOSPHERIC PRESSURE IN A SECOND FLASHING OPERATION, REMOVING FLASHED BUTASEAL OIL FROM THIS SECOND FLASHING OPERATION AND RETURNING SAME TO THE OBSORPTION OPERATION, REMOVING FLASHED BUTADIENE FROM THE SECOND FLASHING OPERATION AND COMBINING SAME WITH THE BUTADIENE FROM THE FIRST FLASHING OPERATION AND WITH THE FEED STOCK VAPOROUS BUTADIENE AT LEAST PARTIALLY CONDENSING THIS COMBINED BUTADIENE AND REMOVING BUTADIENE CONDENSATE AS THE PRODUCT OF THE PROCESS AND PASSING THE UNCONDENSED BUTADIENE TO THE ABOVE MENTION ABSORPTION OPERATION.
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) | 1962-09-21 | 1963-03-23 | 1963-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-21 | 1967-03-23 | 1967-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-21 | 1971-03-23 | 1971-09-22 | $7700.00 | Window Closed / Lapsed |