US3617476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricating oil processing
Assignee: Texaco Inc
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Filing: 1969-04-10
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Granted: 1971-11-02
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Expires: 1989-04-10
Abstract
Abstract Lubricating oils of high-viscosity index are produced in good yield by a sequence involving mild hydrogenation, solvent refining and dewaxing. The process is particularly effective for the treatment of lube oil fractions containing at least 1 percent Conradson Carbon Residue using N-methyl pyrrolidone as the solvent.
Inventors
- 👤 Robert A Woodle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:34
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/06; C10G21/12; C10G2400/00; C10G2400/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
14 words
The process of claim 1 in which the hydrogenation catalyst comprises nickel and molybdenum.
Claim 2
Dependent Claim
17 words
The process of claim 1 in which the solvent having an affinity for aromatics comprises N-methyl pryrrolidone.
Claim 3
Dependent Claim
15 words
The process of claim 3 in which the temperature is between 120* and 180* F.
Claim 4
Dependent Claim
16 words
The process of claim 1 in which the dewaxing solvent comprises methyl ethyl ketone and toluene.
Claim 5
Dependent Claim
25 words
The process of claim 1 in which the hydrogenation temperature is not greater than 650* F. and the hydrogenation pressure does not exceed 500 p.s.i.g.
Claim 6
Dependent Claim
18 words
The process of claim 3 in which the lubricating oil stock contains at least 1 percent Conradson Carbon.
Claim 7
Dependent Claim
18 words
The process of claim 3 in which the solvent to oil volume ratio is between 1:1 and 3:1.
Claim 8
Dependent Claim
191 words
A process for the production of a lubricating oil which comprises fractionating a crude petroleum oil to recover a naphtha fraction therefrom, recovering a lubricating oil stock from the heavier than naphtha fraction, catalytically reforming the naphtha fraction, separating from the reformer effluent a hydrogen-rich stream, treating said lubricating oil stock in a process which consists of contacting same with a hydrogenation catalyst in the presence of at least a portion of said hydrogen-rich stream at a temperature between about 575* and 800* F. and a pressure between about 250 and 600 p.s.i.g, the pressure in the hydrogenation zone being substantially equal to the pressure in the catalytic reforming zone, subjecting the resulting hydrogenation product to solvent extraction at a temperature between about 120* and 250* F. with a solvent having an affinity for aromatic hydrocarbons at a solvent to oil volume ratio of between 1:1 and 6:1 to produce an aromatic-rich extract and an aromatic-poor raffinate, and dewaxing the raffinate using as solvent a mixture comprising an alkyl ketone containing from three to eight carbon atoms and an aromatic hydrocarbon selected from the group consisting of benzene, toluene and xylene.
Claim 9
Dependent Claim
20 words
The process of claim 9 in which the hydrogen-rich stream is passed through the hydrogenation zone on a once-through basis.
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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |