US3923636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of lubricating oils
Assignee: Texaco Inc
•
Filing: 1974-06-03
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Granted: 1975-12-02
•
Expires: 1994-06-03
Abstract
Abstract Lube oils of improved viscosity index are prepared by hydrocracking a heavy oil charge stock, separating the lube oil portion of the product into a light cut and a heavy cut, extracting aromatics from the heavy cut, combining the extracted aromatics with the light cut and hydrogenating the mixture. The products may be used separately or the hydrogenated mixture may be combined with the extracted heavy cut.
Inventors
- 👤 Theodore C Mead
- 👤 Norman R Odell
- 👤 Jr John P Shillinglaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:24
CPC Classifications
C; C10; C10G; C10G47/00; C10G2400/00; C10G2400/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
88 words
A PROCESS FOR THE PRODUCTION OF LUBRICATING OILS WHICH COMPRISES HYDROCRACKING HEAVY OIL CHARGE STOCK OF WHICH AT LEAST A PORTION BOILS ABOVE ABOUT 950*F., RECOVERING A LUBRICATING OIL FRACTION FROM THE HYDROCRACKED PRODUCT, FRACTIONATING THE LUBRICATING OIL FRACTION INTO A LIGHT LUBE OIL CUT AND A HEAVY LUBE OIL CUT, CONTACTING THE HEAVY LUBE OIL CUT WITH A SOLVENT HAVING AN AFFINITY FOR AROMATICS TO PRODUCE AN AROMATIC-POOR RAFFINATE AND AN AROMATIC-RICH EXTRACT, COMBINING THE EXTRACT WITH SAID LIGHT LUBE OIL CUT AND HYDROGENATING THE RESULTING MIXTURE.
Claim 2
Dependent Claim
88 words
A PROCESS FOR THE PRODUCTION OF LUBRICATING OILS WHICH COMPRISES HYDROCRACKING HEAVY OIL CHARGE STOCK OF WHICH AT LEAST A PORTION BOILS ABOVE ABOUT 950*F., RECOVERING A LUBRICATING OIL FRACTION FROM THE HYDROCRACKED PRODUCT, FRACTIONATING THE LUBRICATING OIL FRACTION INTO A LIGHT LUBE OIL CUT AND A HEAVY LUBE OIL CUT, CONTACTING THE HEAVY LUBE OIL CUT WITH A SOLVENT HAVING AN AFFINITY FOR AROMATICS TO PRODUCE AN AROMATIC-POOR RAFFINATE AND AN AROMATIC-RICH EXTRACT, COMBINING THE EXTRACT WITH SAID LIGHT LUBE OIL CUT AND HYDROGENATING THE RESULTING MIXTURE.
Claim 3
Dependent Claim
15 words
The process of claim 1 in which the heavy oil charge is a wax distillate.
Claim 4
Dependent Claim
15 words
The process of claim 1 in which the heavy oil charge is a deasphalted residuum.
Claim 5
Dependent Claim
21 words
The process of claim 1 in which the light lube oil cut has a boiling range of about 600*F. to 750*F.
Claim 6
Dependent Claim
27 words
The process of claim 1 in which the light lube oil cut amounts to between about 25 and 35% by volume of the hydrocracked lubricating oil fraction.
Claim 7
Dependent Claim
16 words
The process of claim 1 in which the hydrocracking temperature is higher than the hydrogenation temperature.
Claim 8
Dependent Claim
16 words
The process of claim 1 in which the solvent having an affinity for aromatics is furfural.
Claim 9
Dependent Claim
16 words
The process of claim 1 in which the solvent having an affinity for aromatics is N-methyl-2-pyrrolidone.
Claim 10
Dependent Claim
28 words
The process of claim 1 in which the hydrogenated mixture of extract and light lube oil cut is combined with the raffinate and the resulting mixture is dewaxed.
References Cited (Backward Citations)
US3189540A
Cited
US3579437A
Cited
US3702817A
Cited
US3666657A
Cited
US3870622A
Cited
US3876522A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |