US2980606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrocarbon refining to reduce sulfur, nitrogen, and naphthenic acid content
Assignee: Shell USA Inc
•
Filing: 1957-08-12
•
Granted: 1961-04-18
•
Expires: 1977-08-12
Abstract
No abstract record available.
Inventors
- 👤 Adolf C Van Beest
- 👤 Nobel Jacobus W Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:42
CPC Classifications
C; C10; C10G; C10G17/00; C10G17/02; C10G17/04; C10G17/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
IN A PROCESS FOR REFINING A PETROLEUM HYDROCARBON MIXTURE CONTAINING NAPHTHENIC ACIDS, SULFUR COMPOUNDS AND NITROGEN BASES WHEREIN THERE IS A MIXING OF THE HYDROCARBON WITH AN AQUEOUS ALKALI WASH SOLUTION WHEREBY THE NAPHTHENIC ACIDS ARE CONVERTED TO WATER-SOLUBLE SOAP AND WHEREIN THERE IS A SEPARATION OF THE MIXTURE OF HYDROCARBON AND WASH SOLUTION TO OBTAIN A WASHED HYDROCARBON PHASE CONTAINING A SMALL AMOUNT OF NAPHTHENIC SOAPS AND AN AQUEOUS WASH PHASE CONTAINING THE REMAINDER OF SAID SOAPS, THE IMPROVEMENT COMPRISING TREATING THE ALKALI-WASHED HYDROCARBON WITH AN EXCESS OF SULFURIC ACID TO REMOVE NITROGEN BASES AND TO ACIDIFY THE NAPHTHENIC SOAPS CONTAINED THEREIN AND SUBSEQUENTLY WASHING THE ACID TREATED HYDROCARBON CONTAINING EXCESS SULFURIC ACID WITH AN AQUEOUS BASIC SOLUTION OF A SALT OF A WEAK ACID AND A STRONG BASE, SAID SOLUTION HAVING A PH OF LESS THAN 8.5, TO NEUTRALIZE SUBSTANTIALLY THE SULFURIC ACID
Claim 2
Dependent Claim
145 words
IN A PROCESS FOR REFINING A PETROLEUM HYDROCARBON MIXTURE CONTAINING NAPHTHENIC ACIDS, SULFUR COMPOUNDS AND NITROGEN BASES WHEREIN THERE IS A MIXING OF THE HYDROCARBON WITH AN AQUEOUS ALKALI WASH SOLUTION WHEREBY THE NAPHTHENIC ACIDS ARE CONVERTED TO WATER-SOLUBLE SOAP AND WHEREIN THERE IS A SEPARATION OF THE MIXTURE OF HYDROCARBON AND WASH SOLUTION TO OBTAIN A WASHED HYDROCARBON PHASE CONTAINING A SMALL AMOUNT OF NAPHTHENIC SOAPS AND AN AQUEOUS WASH PHASE CONTAINING THE REMAINDER OF SAID SOAPS, THE IMPROVEMENT COMPRISING TREATING THE ALKALI-WASHED HYDROCARBON WITH AN EXCESS OF SULFURIC ACID TO REMOVE NITROGEN BASES AND TO ACIDIFY THE NAPHTHENIC SOAPS CONTAINED THEREIN AND SUBSEQUENTLY WASHING THE ACID TREATED HYDROCARBON CONTAINING EXCESS SULFURIC ACID WITH AN AQUEOUS BASIC SOLUTION OF A SALT OF A WEAK ACID AND A STRONG BASE, SAID SOLUTION HAVING A PH OF LESS THAN 8.5, TO NEUTRALIZE SUBSTANTIALLY THE SULFURIC ACID
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) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |