Patent US2963427A successfully refreshed from Google Patents.
US2963427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatics recovery system using butyrolactone in the first stage and propane in the second stage
Assignee: Standard Oil Co
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Filing: 1956-04-18
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Granted: 1960-12-06
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Expires: 1976-04-18
Abstract
No abstract record available.
Inventors
- 👤 Thomas D Nevitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:47
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
THE METHOD OF EFFECTING SUBSTANTIALLY COMPLETE SEPARATION OF A LIGHT NAPHTHA CONSISTING CHIEFLY OF AROMATIC AND PARAFFINIC HYDROCARBON INTO A SUBSTANTIALLY PURE AROMATIC HYDROCARBON FRACTION AND A PARAFFINIC HYDROCARBON FRACTION SUBSTANTIALLY FREE FROM AROMATIC HYDROCARBON, WHICH METHOD COMPRISES COUNTERCURRENTLY EXTRACTING SAID NAPHTHA IN THE LIQUID PHASE IN A FIRST EXTRACTION ZONE WITH ABOUT .5 TO 3 VOLUMES OF BUTYROLACTONE PER VOLUME OF NAPHTHA AT A TEMPERATURE IN THE RANGE OF ABOUT -30*C. TO +50*C. TO OBTAIN A FIRST LIQUID RAFFINIATE OF PARAFFINIC HYDROCARBONS SUBSTANTIALLY FREE FROM AROMATIC HYDROCARBONS AND A FIRST LIQUID EXTRACT CONTAINING AROMATIC AND PARAFFINIC HYDROCARBONS, REMOVING BUTYROLACTONE FROM SAID FIRST LIQUID RAFFINATE, COUNTERCURRENTLY WASHING SAID FIRST LIQUID EXTRACT WITH ABOUT .5 TO 5 VOLUMES OF LIQUID PROPANE PER VOLUME OF FIRST LIQUID EXTRACT AT A TEMPERATURE IN THE RANGE OF -40* TO+40*C. AND UNDER
Claim 2
Independent Claim
137 words
THE METHOD OF EFFECTING SUBSTANTIALLY COMPLETE SEPARATION OF A LIGHT NAPHTHA CONSISTING CHIEFLY OF AROMATIC AND PARAFFINIC HYDROCARBON INTO A SUBSTANTIALLY PURE AROMATIC HYDROCARBON FRACTION AND A PARAFFINIC HYDROCARBON FRACTION SUBSTANTIALLY FREE FROM AROMATIC HYDROCARBON, WHICH METHOD COMPRISES COUNTERCURRENTLY EXTRACTING SAID NAPHTHA IN THE LIQUID PHASE IN A FIRST EXTRACTION ZONE WITH ABOUT .5 TO 3 VOLUMES OF BUTYROLACTONE PER VOLUME OF NAPHTHA AT A TEMPERATURE IN THE RANGE OF ABOUT -30*C. TO +50*C. TO OBTAIN A FIRST LIQUID RAFFINIATE OF PARAFFINIC HYDROCARBONS SUBSTANTIALLY FREE FROM AROMATIC HYDROCARBONS AND A FIRST LIQUID EXTRACT CONTAINING AROMATIC AND PARAFFINIC HYDROCARBONS, REMOVING BUTYROLACTONE FROM SAID FIRST LIQUID RAFFINATE, COUNTERCURRENTLY WASHING SAID FIRST LIQUID EXTRACT WITH ABOUT .5 TO 5 VOLUMES OF LIQUID PROPANE PER VOLUME OF FIRST LIQUID EXTRACT AT A TEMPERATURE IN THE RANGE OF -40* TO+40*C. AND UNDER
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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) | 1963-12-06 | 1964-06-06 | 1964-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-06 | 1968-06-06 | 1968-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-06 | 1972-06-06 | 1972-12-06 | $7700.00 | Window Closed / Lapsed |