US3843515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Countercurrent lube extraction with dual solvent system
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1972-03-15
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Granted: 1974-10-22
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Expires: 1992-03-15
Abstract
Abstract 1. A COUNTERCURRENT EXTRACTION PROCESS FOR THE UPGRADING OF A HYDROCARBON OIL COMPRISING CONTACTING SAID OIL WITH A SOLVENT COMPRISING N-METHYL-2-PYRROLIDONE AND WATER, IN AN EXTRACTION ZONE, THEREBY FORMING A SOLVENTOIL MIXTURE, SAID WATER AND SAID N-METHYL-2-PYRROLIDONE INTRODUCED SEPARATELY INTO SAID EXTRACTION ZONE AND WHEREIN SAID WATER IS INTRODUCED AT A POINT BELOW THE POINT OF INTRODUCTION OF SAID N-METHYL-2-PYRROLIDONE, SO AS TO PREVENT SUBSTANTIAL MIXING OF SAID WATER AND SAID AS TO PREVENT SUBSTANTIAL MIXNG OF SAID WATER AND SAID DONE CONTACTING SAID OIL.
Inventors
- 👤 J Macdonald
- 👤 C Hong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:01
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/06; C10G21/12; C10G21/20; C10G21/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A COUNTERCURRENT EXTRACTION PROCESS FOR THE UPGRADING OF A HYDROCARBON OIL COMPRISING CONTACTING SAID OIL WITH A SOLVENT COMPRISING N-METHYL-2-PYRROLIDONE AND WATER, IN AN EXTRACTION ZONE, THEREBY FORMING A SOLVENTOIL MIXTURE, SAID WATER AND SAID N-METHYL-2-PYRROLIDONE INTRODUCED SEPARATELY INTO SAID EXTRACTION ZONE AND WHEREIN SAID WATER IS INTRODUCED AT A POINT BELOW THE POINT OF INTRODUCTION OF SAID N-METHYL-2-PYRROLIDONE, SO AS TO PREVENT SUBSTANTIAL MIXING OF SAID WATER AND SAID AS TO PREVENT SUBSTANTIAL MIXNG OF SAID WATER AND SAID DONE CONTACTING SAID OIL.
Claim 2
Dependent Claim
84 words
A COUNTERCURRENT EXTRACTION PROCESS FOR THE UPGRADING OF A HYDROCARBON OIL COMPRISING CONTACTING SAID OIL WITH A SOLVENT COMPRISING N-METHYL-2-PYRROLIDONE AND WATER, IN AN EXTRACTION ZONE, THEREBY FORMING A SOLVENTOIL MIXTURE, SAID WATER AND SAID N-METHYL-2-PYRROLIDONE INTRODUCED SEPARATELY INTO SAID EXTRACTION ZONE AND WHEREIN SAID WATER IS INTRODUCED AT A POINT BELOW THE POINT OF INTRODUCTION OF SAID N-METHYL-2-PYRROLIDONE, SO AS TO PREVENT SUBSTANTIAL MIXING OF SAID WATER AND SAID AS TO PREVENT SUBSTANTIAL MIXNG OF SAID WATER AND SAID DONE CONTACTING SAID OIL.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |