US2682498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of sulfuric acid sludges containing aromatic sulfonic acids
Assignee: Standard Oil Development Co
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Filing: 1951-05-21
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Granted: 1954-06-29
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Expires: 1971-05-21
Abstract
No abstract record available.
Inventors
- 👤 Albert J Shmidl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:59
CPC Classifications
C; C10; C10G; C10G17/00; C10G17/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A METHOD FOR TREATING A SULFURIC ACID SLUDGE CONTAINING AROMATIC SULFONIC ACIDS RESULTING FROM TREATING AN AROMATIC FRACTION CONTAINING OLEFIN WITH STRONG SULFURIC ACID UNDER CONDITIONS TO REMOVE THE OLEFIN THEREFROM, THE STEPS INCLUDING ADMIXING SAID SLUDGE CONTAINING AROMATIC SULFONATES WITH SULFURIC ACID HAVING A STRENGTH WITHIN THE RANGE OF APPROXIMATELY 60% TO 70% IN AN AMOUNT WITHIN THE RANGE OF 1 TO 4 VOLUMES OF ACID PER VOLUME OF SAID SLUDGE, VIGOROUSLY MECHANICALLY AGITATING THE MIXTURE OF SLUDGE AND SULFURIC ACID WHILE MAINTAINING IT AT A TEMPERATURE WITHIN THE RANGE OF APPROXIMATELY 300* TO 330* F. TO FORM GRANULAR PARTICLES OF CARBON SUFFICIENTLY FINE THAT AT LEAST 60% WILL PASS THROUGH A 40 MESH SCREEN AND AT LEAST 75% WILL PASS THROUGH A 20 MESH SCREEN AND SUBSEQUENTLY SETTLING TO FORM AN ACID PHASE CONTAINING SAID GRANULAR CARBON PARTICLES AND A HYDROCARBON PHASE CONTAINING AROMATIC MATERIAL AND SEPARATELY RECOVERING SAID PHASES.
Claim 2
Independent Claim
152 words
A METHOD FOR TREATING A SULFURIC ACID SLUDGE CONTAINING AROMATIC SULFONIC ACIDS RESULTING FROM TREATING AN AROMATIC FRACTION CONTAINING OLEFIN WITH STRONG SULFURIC ACID UNDER CONDITIONS TO REMOVE THE OLEFIN THEREFROM, THE STEPS INCLUDING ADMIXING SAID SLUDGE CONTAINING AROMATIC SULFONATES WITH SULFURIC ACID HAVING A STRENGTH WITHIN THE RANGE OF APPROXIMATELY 60% TO 70% IN AN AMOUNT WITHIN THE RANGE OF 1 TO 4 VOLUMES OF ACID PER VOLUME OF SAID SLUDGE, VIGOROUSLY MECHANICALLY AGITATING THE MIXTURE OF SLUDGE AND SULFURIC ACID WHILE MAINTAINING IT AT A TEMPERATURE WITHIN THE RANGE OF APPROXIMATELY 300* TO 330* F. TO FORM GRANULAR PARTICLES OF CARBON SUFFICIENTLY FINE THAT AT LEAST 60% WILL PASS THROUGH A 40 MESH SCREEN AND AT LEAST 75% WILL PASS THROUGH A 20 MESH SCREEN AND SUBSEQUENTLY SETTLING TO FORM AN ACID PHASE CONTAINING SAID GRANULAR CARBON PARTICLES AND A HYDROCARBON PHASE CONTAINING AROMATIC MATERIAL AND SEPARATELY RECOVERING SAID PHASES.
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) | 1957-06-28 | 1957-12-28 | 1958-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-28 | 1961-12-28 | 1962-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-28 | 1965-12-28 | 1966-06-29 | $7700.00 | Window Closed / Lapsed |