US4269695A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reclaiming wax contaminated lubricating oils
Assignee: Mobil Oil AS
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Filing: 1979-08-01
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Granted: 1981-05-26
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Expires: 1999-08-01
Abstract
Abstract Dewaxed lube base stock oil which forms a wax haze on storage at a temperature above its cloud point is treated by contacting the oil and hydrogen with a zeolite catalyst such as ZSM-5 to eliminate the wax-haze formation. The method may be used to reclaim wax-contaminated lube base stock oils and other wax-contaminated hydrocarbon oils.
Inventors
- 👤 Murray R. Silk
- 👤 Richard T. Cleveland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:01
CPC Classifications
C; C10; C10G; C10G45/00; C10G45/58; C10G45/60; C10G45/64; C10G2400/00; C10G2400/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
136 words
A method for reclaiming a contaminated dewaxed lube base stock oil with an excessive tendency to form particulate wax when kept at a predetermined storage temperature, which method consists of: contacting said dewaxed oil and hydrogen in a single reaction zone at a temperature of 500° to 675° F., a hydrogen partial pressure of about 100 to 1500 psia, and at a space velocity higher than 2 up to about 10 LHSV with a catalyst comprising a crystalline aluminosilicate zeolite having a silica/alumina ratio of at least 12 and a Constraint Index of about 1 to about 12; and recovering at least 95 wt.% of a reclaimed lube base stock oil having a pour point not more than 20° F. lower than said contaminated oil, and which forms substantially no particulate wax at said storage temperature.
Claim 2
Dependent Claim
19 words
The method described in claim 1 wherein said reclaimed lube oil is recovered in at least 97 wt.% yield.
Claim 3
Dependent Claim
26 words
The method described in claim 1 wherein said predetermined storage temperature is at least about 10° F. higher than the cloud point of said contaminated oil.
Claim 4
Dependent Claim
29 words
The method described in claim 2 wherein the pour point of said reclaimed lube base stock oil is about the same as the pour point of said contaminated oil.
Claim 5
Dependent Claim
26 words
The method described in claim 2 wherein said predetermined storage temperature is at least about 10° F. higher than the cloud point of said contaminated oil.
Claim 6
Dependent Claim
27 words
The method described in claim 5 wherein the pour point of said reclaimed lube oil is substantially the same as the pour point of said contaminated oil.
Claim 7
Dependent Claim
15 words
The method described in claim 1 wherein said catalyst comprises ZSM-5 and a hydrogenation component.
Claim 8
Dependent Claim
15 words
The method described in claim 2 wherein said catalyst comprises ZSM-5 and a hydrogenation component.
Claim 9
Dependent Claim
15 words
The method described in claim 3 wherein said catalyst comprises ZSM-5 and a hydrogenation component.
Claim 10
Dependent Claim
15 words
The method described in claim 4 wherein said catalyst comprises ZSM-5 and a hydrogenation component.
Claim 11
Dependent Claim
15 words
The method described in claim 5 wherein said catalyst comprises ZSM-5 and a hydrogenation component.
Claim 12
Dependent Claim
15 words
The method described in claim 6 wherein said catalyst comprises ZSM-5 and a hydrogenation component.
Claim 13
Dependent Claim
36 words
The method described in claim 7 or claim 8 or claim 9 or claim 10 or claim 11 or claim 12 wherein said catalyst has an alpha value in the range of about 25 to 150.
Claim 14
Dependent Claim
49 words
The method described in claim 7 or claim 8 or claim 9 or claim 10 or claim 11 or claim 12 wherein said catalyst has an alpha value in the range of about 25 to 150 and consists of ZSM-5 in a matrix and said hydrogenation component is nickel.
Claim 15
Independent Claim
98 words
A method for upgrading a hydrocarbon oil which forms undesirable particulate wax when kept at a predetermined storage temperature, which method comprises: contacting said oil and hydrogen at from 500° to 675° F. and at a space velocity higher than 2 up to about 10 LHSV with a catalyst comprising a hydrogenation component and a crystalline aluminosilicate zeolite having a silica/alumina ratio of at least about 12 and a Constraint Index of about 1 to about 12; and recovering at least 95 wt.% of an upgraded oil which forms substantially no particulate wax at said predetermined storage temperature.
Claim 16
Independent Claim
98 words
A method for upgrading a hydrocarbon oil which forms undesirable particulate wax when kept at a predetermined storage temperature, which method comprises: contacting said oil and hydrogen at from 500° to 675° F. and at a space velocity higher than 2 up to about 10 LHSV with a catalyst comprising a hydrogenation component and a crystalline aluminosilicate zeolite having a silica/alumina ratio of at least about 12 and a Constraint Index of about 1 to about 12; and recovering at least 95 wt.% of an upgraded oil which forms substantially no particulate wax at said predetermined storage temperature.
Claim 17
Dependent Claim
36 words
The method described in claim 15 wherein said catalyst consists essentially of ZSM-5 in a matrix and a hydrogenation component, and is further characterized by an alpha value in the range of about 25 to 150.
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) | 1984-05-25 | 1984-11-24 | 1985-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-25 | 1988-11-24 | 1989-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-25 | 1992-11-24 | 1993-05-26 | $7700.00 | Window Closed / Lapsed |