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US4011154A Expired / Lapsed US ⏱️ 0.0 years remaining

Production of lubricating oils

Assignee: Chevron USA Inc
•
Filing: 1976-06-18
•
Granted: 1977-03-08
•
Expires: 1996-06-18
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Abstract

Abstract A process is disclosed for producing a lubricating oil base stock by: (1) fractionating a hydrocarbon feedstock boiling above 650° F into a plurality of fractions including at least a lower-boiling fraction and a higher-boiling fraction; (2) contacting the lower-boiling fraction and hydrogen in a first hydrocracking zone, at hydrocracking conditions, with a hydrocracking catalyst to obtain an effluent comprising hydrocarbons boiling in the range of the feedstock and hydrocarbons boiling below the boiling range of the feedstock; (3) contacting at least the hydrocarbons boiling in the range of said feedstock formed in step (2), the higher-boiling fraction from step (1) without substantial intermediate deasphalting thereof, and hydrogen in a second hydrocracking zone, at hydrocracking conditions, with a hydrocracking catalyst to obtain a lubricating oil base stock including a plurality of lube oil fractions of reduced viscosity index spread over the range of the lube oil fractions; and recovering the lube oil base stock. Preferably, the resulting lube oil base stocks have a viscosity index spread of not more than about 15 units, preferably not more than 10, over the lube oil base stock viscosity range of light neutrals to bright stocks.

Inventors

  • 👤 Bruce E. Stangeland
  • 👤 Harold F. Mason

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 17:11
CPC Classifications
C; C10; C10G; C10G65/00; C10G2400/00; C10G2400/10

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 156 words
A process for producing a lubricating oil base stock comprising: 1. fractionating a hydrocarbon feedstock boiling above 650° F into a plurality of fractions including at least a lower-boiling fraction and a higher-boiling fraction; 2. contacting said lower-boiling fraction and hydrogen in a first hydrocracking zone, at hydrocracking conditions, with a hydrocracking catalyst to obtain an effluent comprising: a. hydrocarbons boiling in the range of said feedstock, and b. hydrocarbons boiling below the boiling range of said feedstock; 3. contacting (a) said hydrocarbons formed in step (2) boiling in the range of said feedstock, (b) said higher-boiling fraction, formed in step (1) without intermediate deasphalting thereof, and (c) hydrogen in a second hydrocracking zone, at hydrocracking conditions, with a hydrocracking catalyst to obtain a lubricating oil base stock comprising a plurality of lube oil fractions of reduced viscosity index spread over the range of said lube oil fractions; and 4. recovering said lubricating oil base stock.
Claim 2
Dependent Claim 156 words
A process for producing a lubricating oil base stock comprising: 1. fractionating a hydrocarbon feedstock boiling above 650° F into a plurality of fractions including at least a lower-boiling fraction and a higher-boiling fraction; 2. contacting said lower-boiling fraction and hydrogen in a first hydrocracking zone, at hydrocracking conditions, with a hydrocracking catalyst to obtain an effluent comprising: a. hydrocarbons boiling in the range of said feedstock, and b. hydrocarbons boiling below the boiling range of said feedstock; 3. contacting (a) said hydrocarbons formed in step (2) boiling in the range of said feedstock, (b) said higher-boiling fraction, formed in step (1) without intermediate deasphalting thereof, and (c) hydrogen in a second hydrocracking zone, at hydrocracking conditions, with a hydrocracking catalyst to obtain a lubricating oil base stock comprising a plurality of lube oil fractions of reduced viscosity index spread over the range of said lube oil fractions; and 4. recovering said lubricating oil base stock.
Claim 3
Dependent Claim 23 words
The process of claim 1 wherein the hydrocracking conditions in step (2) include a higher temperature than the hydrocracking conditions in step (3).
Claim 4
Dependent Claim 24 words
The process of claim 1 wherein the hydrocracking catalyst in said first zone is the same as the hydrocracking catalyst in said second zone.
Claim 5
Dependent Claim 95 words
The process of claim 3 wherein said hydrocarbon feedstock is a solvent deasphalted oil boiling in the range of from about 900° to about 1200° F, said lower boiling fraction has a boiling range of from about 900° to about 1000° F, and said higher boiling fraction has a boiling range of from about 1000° to about 1200° F, said lubricating oil base stock includes a 1000° F+ bright stock, and the viscosity index spread between a 130 neutral fraction of said base stock and said bright stock is not more than 15 V.I. units.
Claim 6
Dependent Claim 29 words
The process of claim 4 wherein the viscosity index spread between said 130 neutral fraction and said 1000° F+ bright stock fraction is not more than 10 V.I. units.

References Cited (Backward Citations)

US3579435A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1980-03-07 1980-09-06 1981-03-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1984-03-07 1984-09-06 1985-03-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1988-03-07 1988-09-06 1989-03-08 $7700.00 Window Closed / Lapsed

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