Patent US2855433A successfully refreshed from Google Patents.
US2855433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of olefin hydrocarbons
Assignee: Phillips Petroleum Co
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Filing: 1955-05-13
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Granted: 1958-10-07
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Expires: 1975-05-13
Abstract
No abstract record available.
Inventors
- 👤 Jr Joseph R Cobb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:57
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/152; C07C7/156; Y; Y10; Y10S; Y10S62/00; Y10S62/931; Y10S62/932
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
170 words
THE METHOD OF SEPARATING AND RECOVERING AN OLEFIN FROM A FEED CONTAINING SAID OLEFIN, A HIGHER OLEFIN, AND PARAFFINS, THE COMPOUNENTS OF SAID FEED COMPRISING A CLOSELY BOILING MIXTURE COMPRISING CONTACTING SAID FEED IN AN ABSORPTION ZONE WITH A SELECTIVE SOLVENT WHEREBY AN EASILY DECOMPOSABLE OLEFIN-ABSORBENT ADDITION COMPOUND IS FORMED, REMOVING NON-ABSORBED COMPONENTS OF SAID FEED FROM SAID ABSORPTION ZONE, REMOVING SAID ADDITION COMPOUND FROM SAID ABSORPTION ZONE AND INTRODUCING SAME INTO A STRIPPING ZONE OPERATED AT APPROXIMATELY ATMOSPHERIC PRESSURE AND BELOW THE DECOMPOSITION TEMPERATURE OF SAID ABSORBENT, SAID STRIPPING ZONE BEING SUPPLIED WITH A STRIPPING GAS COMPRISING AN OLEGIN HIGHER THAN SAID DESIRED OLEFIN SUPPLIED AS HEREINAFTER DESCRIBED, REMOVING STRIPPED ABSORBENT FROM SAID STRIPPING ZONE, REMOVING STRIPPED OLEFINS FROM SAID STRIPPING ZONE, AND INTRODUCING SAID STRIPPED OLEFINS INTO A FRACTIONATION ZONE, REMOVING SAID DESIRED OLEFIN AS AN OVERHEAD PRODUCT OF SAID FRACTIONATION ZONE, REMOVING SAID HIGHER OLEFIN AS A KETTLE PRODUCT OF SAID FRACTIONATION ZONE, AND INTRODUCING AT LEAST A PORTION OF SAID HIGHER OLEFIN INTO SAID STRIPPING ZONE.
Claim 2
Independent Claim
170 words
THE METHOD OF SEPARATING AND RECOVERING AN OLEFIN FROM A FEED CONTAINING SAID OLEFIN, A HIGHER OLEFIN, AND PARAFFINS, THE COMPOUNENTS OF SAID FEED COMPRISING A CLOSELY BOILING MIXTURE COMPRISING CONTACTING SAID FEED IN AN ABSORPTION ZONE WITH A SELECTIVE SOLVENT WHEREBY AN EASILY DECOMPOSABLE OLEFIN-ABSORBENT ADDITION COMPOUND IS FORMED, REMOVING NON-ABSORBED COMPONENTS OF SAID FEED FROM SAID ABSORPTION ZONE, REMOVING SAID ADDITION COMPOUND FROM SAID ABSORPTION ZONE AND INTRODUCING SAME INTO A STRIPPING ZONE OPERATED AT APPROXIMATELY ATMOSPHERIC PRESSURE AND BELOW THE DECOMPOSITION TEMPERATURE OF SAID ABSORBENT, SAID STRIPPING ZONE BEING SUPPLIED WITH A STRIPPING GAS COMPRISING AN OLEGIN HIGHER THAN SAID DESIRED OLEFIN SUPPLIED AS HEREINAFTER DESCRIBED, REMOVING STRIPPED ABSORBENT FROM SAID STRIPPING ZONE, REMOVING STRIPPED OLEFINS FROM SAID STRIPPING ZONE, AND INTRODUCING SAID STRIPPED OLEFINS INTO A FRACTIONATION ZONE, REMOVING SAID DESIRED OLEFIN AS AN OVERHEAD PRODUCT OF SAID FRACTIONATION ZONE, REMOVING SAID HIGHER OLEFIN AS A KETTLE PRODUCT OF SAID FRACTIONATION ZONE, AND INTRODUCING AT LEAST A PORTION OF SAID HIGHER OLEFIN INTO SAID STRIPPING ZONE.
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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) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |