US3248308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isoprene purification by extractive distillation with acetonitrile and recovery of acetonitrile thus used
Assignee: Phillips Petroleum Co
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Filing: 1962-10-30
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Granted: 1966-04-26
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Expires: 1982-10-30
Abstract
No abstract record available.
Inventors
- 👤 Donald M Haskell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:12
CPC Classifications
C; C07; C07C; C07C255/00; C07C7/00; C07C7/04; C07C7/05; C07C7/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
THE RECOVERY OF ISOPRENE FROM AN AMYLENES-CONTAINING HYDROCARBON FIRST STREAM WHICH COMPRISES CONTACTING SAID FIRST STREAM WITH ACETONITRILE UNDER CONDITIONS OF EXTRACTIVE DISTILLATION TO OBTAIN AN AMYLENES CONTAINING HYDROCARBON STREAM WHICH IS REMOVED FROM THE OPERATION, AND A SECOND STREAM CONTAINING ISOPRENE AND ACETONITRILE, STRIPPING ISOPRENE AND UNAVOIDABLY VAPORIZED ACETONITRILE FROM SAID SECOND STREAM, WASHING THE VAPORS OF ISOPRENE AND ACETONTRILE THUS OBTAINED WITH WATER, OBTAINING AN ISOPRENE-CONTAINING STREAM AND A WATER SOLUTION OF ACETONITRILE, CONTACTING SAID WATER SOLUTION WITH AT LEAST A PORTION OF SAID AMYLENES-CONTAINING STREAM UNDER CONDITIONS OF PREFERENTIAL EXTRACTION OF ACETONITRILE THEREBY OBTAINING AN AMYLENES-CONTAINING STREAM ALSO CONTAINING ACETONITRILE AND PASSING THE LAST OBTAINED STREAM TO SAID CONTACTING OF SAID FIRST STREAM WITH ACETONITRILE.
Claim 2
Dependent Claim
118 words
THE RECOVERY OF ISOPRENE FROM AN AMYLENES-CONTAINING HYDROCARBON FIRST STREAM WHICH COMPRISES CONTACTING SAID FIRST STREAM WITH ACETONITRILE UNDER CONDITIONS OF EXTRACTIVE DISTILLATION TO OBTAIN AN AMYLENES CONTAINING HYDROCARBON STREAM WHICH IS REMOVED FROM THE OPERATION, AND A SECOND STREAM CONTAINING ISOPRENE AND ACETONITRILE, STRIPPING ISOPRENE AND UNAVOIDABLY VAPORIZED ACETONITRILE FROM SAID SECOND STREAM, WASHING THE VAPORS OF ISOPRENE AND ACETONTRILE THUS OBTAINED WITH WATER, OBTAINING AN ISOPRENE-CONTAINING STREAM AND A WATER SOLUTION OF ACETONITRILE, CONTACTING SAID WATER SOLUTION WITH AT LEAST A PORTION OF SAID AMYLENES-CONTAINING STREAM UNDER CONDITIONS OF PREFERENTIAL EXTRACTION OF ACETONITRILE THEREBY OBTAINING AN AMYLENES-CONTAINING STREAM ALSO CONTAINING ACETONITRILE AND PASSING THE LAST OBTAINED STREAM TO SAID CONTACTING OF SAID FIRST STREAM WITH ACETONITRILE.
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) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |