Patent US3677441A successfully refreshed from Google Patents.
Patent US3012947A successfully refreshed from Google Patents.
US3012947A
Expired / Lapsed
US
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Recovery of high purity isoprene from light steam cracked distillate
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1959-06-15
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Granted: 1961-12-12
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Expires: 1979-06-15
Abstract
No abstract record available.
Inventors
- 👤 Kelley Roland Timothy
- 👤 Vries Arthur Douwe De
- 👤 James Jimmy Donald
- 👤 Walker James Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:28
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A PROCESS FOR THE SEPARATION OF ISOPRENE OF HIGH PURITY FROM A HYDROCARBON FRACTION ALSO CONTAINING ACETYLENES WHICH COMPRISES THE STEPS OF EXTRACTIVELY DISTILLING THE HYDROCARBON FRACTION WITH A SOLVENT FOR THE ISOPRENE SELECTED FROM THE GROUP CONSISTING OF ACETONE AND ACETONITRILE SEPARATING A MINOR AMOUNT OF A FIRST EXTRACT STREAM CONTAINING MORE THAN 1 WT. PERCENT OF ACETYLENES, SAID ACETYLENES BEING PREDOMINANTLY ALPHA ACETYLENES, SEPARATING A MAJOR AMOUNT OF A SECOND EXTRACT STREAM CONTAINING SMALLER AMOUNTS OF ACETYLENES THAN THE FIRST EXTRACT STREAM, FRACTIONATING THE SECOND STREAM TO SEPARATE A MINOR AMOUNT OF AN ISOPRENE STREAM CONTAINING MORE THAN ABOUT 2 WT. PERCENT OF ACETYLENES, SAID ACETYLENES BEING PREDOMINANTLY BETA ACETYLENES AND A MAJOR AMOUNT OF A HIGHLY PURE ISOPRENE STREAM SUBSTANTIALLY FREE OF ACETYLENES.
Claim 2
Dependent Claim
126 words
A PROCESS FOR THE SEPARATION OF ISOPRENE OF HIGH PURITY FROM A HYDROCARBON FRACTION ALSO CONTAINING ACETYLENES WHICH COMPRISES THE STEPS OF EXTRACTIVELY DISTILLING THE HYDROCARBON FRACTION WITH A SOLVENT FOR THE ISOPRENE SELECTED FROM THE GROUP CONSISTING OF ACETONE AND ACETONITRILE SEPARATING A MINOR AMOUNT OF A FIRST EXTRACT STREAM CONTAINING MORE THAN 1 WT. PERCENT OF ACETYLENES, SAID ACETYLENES BEING PREDOMINANTLY ALPHA ACETYLENES, SEPARATING A MAJOR AMOUNT OF A SECOND EXTRACT STREAM CONTAINING SMALLER AMOUNTS OF ACETYLENES THAN THE FIRST EXTRACT STREAM, FRACTIONATING THE SECOND STREAM TO SEPARATE A MINOR AMOUNT OF AN ISOPRENE STREAM CONTAINING MORE THAN ABOUT 2 WT. PERCENT OF ACETYLENES, SAID ACETYLENES BEING PREDOMINANTLY BETA ACETYLENES AND A MAJOR AMOUNT OF A HIGHLY PURE ISOPRENE STREAM SUBSTANTIALLY FREE OF ACETYLENES.
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) | 1964-12-11 | 1965-06-12 | 1965-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-11 | 1969-06-12 | 1969-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-11 | 1973-06-12 | 1973-12-12 | $7700.00 | Window Closed / Lapsed |