US3968023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of lubricating oils
Assignee: Mobil Oil AS
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Filing: 1975-01-30
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Granted: 1976-07-06
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Expires: 1995-01-30
Abstract
Abstract Residual oils are upgraded to lube oil base stocks by a combination process involving deasphalting, solvent extraction and hydrocracking arranged to particularly promote the efficient production of lube oil products.
Inventors
- 👤 Tsoung-Yuan Yan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:39
CPC Classifications
C; C10; C10G; C10G67/00; C10G67/02; C10G67/14; C10G2400/00; C10G2400/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
241 words
A method for producing lube oils from an atmospheric residual oil which comprises, separating an atmospheric residual oil to recover a light vacuum gas oil, a heavy vacuum gas oil and a resid containing asphaltic material, deasphalting said resid to provide a first raffinate product thereof, solvent extraction said light vacuum gas oil to provide a second raffinate phase and a first extract phase, separating solvent from said extracted light vacuum gas oil, combining said first extract phase with said first raffinate product of said resid deasphalting operation to form a mixed oil phase comprising solvent with extracted polycyclic aromatics, using said mixed oil extract phase with solvent to remove undesired aromatics from said heavy vacuum gas oil in a second solvent extraction zone, recovering a second extract phase from said second solvent extraction zone and separating solvent from aromatics in said second extract phase, recycling solvent thus separated to said second solvent extraction zone, recovering a third raffinate phase from said second solvent extraction zone and separating solvent from an oil phase comprising said third raffinate and boiling above about 800°F., recycling solvent thus separated to said second extraction zone, passing said oil phase boiling above about 800°F. to a hydrocracking zone maintained under relatively mild hydrocracking conditions selected to enhance the yield of lube oil base products and separating a product of said hydrocracking operation boiling above about 650°F into a plurality of separate boiling range lube oil fractions.
Claim 2
Independent Claim
241 words
A method for producing lube oils from an atmospheric residual oil which comprises, separating an atmospheric residual oil to recover a light vacuum gas oil, a heavy vacuum gas oil and a resid containing asphaltic material, deasphalting said resid to provide a first raffinate product thereof, solvent extraction said light vacuum gas oil to provide a second raffinate phase and a first extract phase, separating solvent from said extracted light vacuum gas oil, combining said first extract phase with said first raffinate product of said resid deasphalting operation to form a mixed oil phase comprising solvent with extracted polycyclic aromatics, using said mixed oil extract phase with solvent to remove undesired aromatics from said heavy vacuum gas oil in a second solvent extraction zone, recovering a second extract phase from said second solvent extraction zone and separating solvent from aromatics in said second extract phase, recycling solvent thus separated to said second solvent extraction zone, recovering a third raffinate phase from said second solvent extraction zone and separating solvent from an oil phase comprising said third raffinate and boiling above about 800°F., recycling solvent thus separated to said second extraction zone, passing said oil phase boiling above about 800°F. to a hydrocracking zone maintained under relatively mild hydrocracking conditions selected to enhance the yield of lube oil base products and separating a product of said hydrocracking operation boiling above about 650°F into a plurality of separate boiling range lube oil fractions.
Claim 3
Dependent Claim
36 words
The method of claim 1 wherein fresh furfural solvent is added to said first solvent extraction zone and is cascaded with solvent removed aromatics to said second solvent extraction zone processing a heavy vacuum gas oil.
Claim 4
Dependent Claim
43 words
The method of claim 1 wherein the raffinate product of solvent refined light vacuum gas oil separated from solvent and the 650°F plus lube oil products of the hydrocracking operation are blended for the production of turbine oil and multi-grade automotive lube oils.
Claim 5
Dependent Claim
48 words
The method of claim 1 wherein the product of hydrocracking boiling above about 650°F is separated to recover a first lube oil fraction boiling in the range of 650°to 850°F, a second lube oil fraction boiling in the range of 850°-1000°F and a third fraction boiling above 1000°F.
Claim 6
Dependent Claim
17 words
The method of claim 4 wherein one or more of the separated lube oil fractions are dewaxed.
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) | 1979-07-06 | 1980-01-05 | 1980-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-06 | 1984-01-05 | 1984-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-06 | 1988-01-05 | 1988-07-06 | $7700.00 | Window Closed / Lapsed |