US4561967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
One-step stabilizing and dewaxing of lube oils
Assignee: Chevron USA Inc
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Filing: 1983-12-15
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Granted: 1985-12-31
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Expires: 2003-12-15
Abstract
Abstract A one-step dewaxing and stabilizing process for hydrocracked lube oils is disclosed wherein said process employs an intermediate pore size zeolite having a high silica-alumina ratio and being free of hydrogenation components and said process being operated at pressures of less than 13 bar.
Inventors
- 👤 Stephen J. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:41
CPC Classifications
C; C10; C10G; C10G11/00; C10G11/02; C10G11/04; C10G11/05; C10G29/00; C10G29/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
79 words
A lubricating oil-stabilizing process, comprising: catalytically stabilizing a hydrocracked lube oil feedstock by contacting said feedstock in the substantial absence of hydrogen and at a pressure of less than about 13 bar with a catalyst which contains no hydrogenation component and which comprises an intermediate pore size zeolite having a silica-to-alumina mole ratio of greater than about 200:1 and being in the hydrogen form, to produce a stabilized light neutral oil of good ultraviolet stability and good color. PG,17
Claim 2
Dependent Claim
79 words
A lubricating oil-stabilizing process, comprising: catalytically stabilizing a hydrocracked lube oil feedstock by contacting said feedstock in the substantial absence of hydrogen and at a pressure of less than about 13 bar with a catalyst which contains no hydrogenation component and which comprises an intermediate pore size zeolite having a silica-to-alumina mole ratio of greater than about 200:1 and being in the hydrogen form, to produce a stabilized light neutral oil of good ultraviolet stability and good color. PG,17
Claim 3
Dependent Claim
21 words
A process according to claim 1 wherein said intermediate pore size zeolite is selected from ZSM-5, ZSM-11, silicalite, and mixtures thereof.
Claim 4
Dependent Claim
15 words
A process according to claim 1 wherein said feedstock is substantially free of diluent gases.
Claim 5
Dependent Claim
15 words
A process according to claim 1 wherein the pressure is less than about 6.5 bar.
Claim 6
Dependent Claim
18 words
A process according to claim 1 wherein said zeolite has a silica-to-alumina mole ratio greater than about 500:1.
Claim 7
Dependent Claim
18 words
A process according to claim 2 wherein said zeolite has a silica-to-alumina mole ratio greater than about 500:1.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-30 | 1989-07-01 | 1989-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-30 | 1993-07-01 | 1993-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-30 | 1997-07-01 | 1997-12-31 | $7700.00 | Window Closed / Lapsed |