US3222416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extraction process
Assignee: Shell USA Inc
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Filing: 1961-12-18
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Granted: 1965-12-07
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Expires: 1981-12-18
Abstract
No abstract record available.
Inventors
- 👤 Harry D Evans
- 👤 Eldred E Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:22
CPC Classifications
C; C10; C10G; C10G21/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
194 words
A PROCESS FOR THE RECOVERY OF BENZENE FROM A LIGHT HYDROCARBON PLATFORMATE FRACTION LIQUID FEED MIXTURE COMPRISING: (1) COUNTERCURRENTLY CONTACTING SAID FEED MIXTURE IN A VAPOR-LIQUID CONTACTING ZONE WITH A VAPOR FRACTION RECOVERED FROM AN EXTRACTIVE STRIPPING ZONE WHEREBY AT LEAST PART OF SAID VAPOR IS DIRECTLY CONDENSED AND WHEREIN A COMBINED FEED FRACTION IS FORMED; (2) PASSING SAID COMBINED FEED FRACTION COMPRISING A MIXTURE OF FEED AND CONDENSED VAPOR FROM SAID EXTRACTIVE STRIPPING ZONE TO A LIQUID-LIQUID EXTRACTION ZONE; (3) COUNTERCURRENTLY CONTACTING SAID COMBINED FEED FRACTION IN SAID LIQUID-LIQUID EXTRACTION ZONE WITH AN AROMATIC-SELECTIVE SULFOLANE SOLVENT WHEREBY A RAFFINATE COMPRISING SUBSTANTIALLY NON-AROMATIC HYDROCARBONS IS WITHDRAWN OVERHEAD, AND WHEREIN A FAT SOLVENT STREAM COMPRISING SUBSTANTIALLY AROMATICS, SULFOLANE SOLVENT, AND A MINOR AMOUNT OF NON-AROMATICS IS RECOVERED; (4) PASSING SAID FAT SOLVENT STREAM TO AN EXTRACTIVE STRIPPING ZONE WHEREIN A BOTTOMS PRODUCT COMPRISING SUBSTANTIALLY SULFOLANE SOLVENT AND AROMATICS OF REDUCED SATURATES CONTENT IS RECOVERED AND LATER USED AS THE SOURCE OF AROMATICS PRODUCT AND SOLVENT FOR RECYCLE; (5) RECOVERING OVERHEAD FROM SAID EXTRACTIVE STRIPPING ZONE A VAPOR PRODUCT COMPRISING AROMATICS AND SATURATES WHICH ARE DIRECTLY CONTACTED WITH SAID FEED FRACTION IN SAID VAPOR CONTACTING ZONE.
Claim 2
Dependent Claim
194 words
A PROCESS FOR THE RECOVERY OF BENZENE FROM A LIGHT HYDROCARBON PLATFORMATE FRACTION LIQUID FEED MIXTURE COMPRISING: (1) COUNTERCURRENTLY CONTACTING SAID FEED MIXTURE IN A VAPOR-LIQUID CONTACTING ZONE WITH A VAPOR FRACTION RECOVERED FROM AN EXTRACTIVE STRIPPING ZONE WHEREBY AT LEAST PART OF SAID VAPOR IS DIRECTLY CONDENSED AND WHEREIN A COMBINED FEED FRACTION IS FORMED; (2) PASSING SAID COMBINED FEED FRACTION COMPRISING A MIXTURE OF FEED AND CONDENSED VAPOR FROM SAID EXTRACTIVE STRIPPING ZONE TO A LIQUID-LIQUID EXTRACTION ZONE; (3) COUNTERCURRENTLY CONTACTING SAID COMBINED FEED FRACTION IN SAID LIQUID-LIQUID EXTRACTION ZONE WITH AN AROMATIC-SELECTIVE SULFOLANE SOLVENT WHEREBY A RAFFINATE COMPRISING SUBSTANTIALLY NON-AROMATIC HYDROCARBONS IS WITHDRAWN OVERHEAD, AND WHEREIN A FAT SOLVENT STREAM COMPRISING SUBSTANTIALLY AROMATICS, SULFOLANE SOLVENT, AND A MINOR AMOUNT OF NON-AROMATICS IS RECOVERED; (4) PASSING SAID FAT SOLVENT STREAM TO AN EXTRACTIVE STRIPPING ZONE WHEREIN A BOTTOMS PRODUCT COMPRISING SUBSTANTIALLY SULFOLANE SOLVENT AND AROMATICS OF REDUCED SATURATES CONTENT IS RECOVERED AND LATER USED AS THE SOURCE OF AROMATICS PRODUCT AND SOLVENT FOR RECYCLE; (5) RECOVERING OVERHEAD FROM SAID EXTRACTIVE STRIPPING ZONE A VAPOR PRODUCT COMPRISING AROMATICS AND SATURATES WHICH ARE DIRECTLY CONTACTED WITH SAID FEED FRACTION IN SAID VAPOR CONTACTING ZONE.
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) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |