US3980550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic hydrodewaxing
Assignee: Mobil Oil AS
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Filing: 1975-12-08
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Granted: 1976-09-14
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Expires: 1995-12-08
Abstract
Abstract Improved catalytic hydrodewaxing of gas oil fractions using as the catalyst a high silica to alumina ratio crystalline aluminosilicate zeolite having shape selective properties for normal and mono methyl configuration paraffins, by using as the catalyst such a zeolite having a multi-valent transition metal and a Group VIII noble metal incorporated therewith.
Inventors
- 👤 Robert L. Gorring
- 👤 George F. Shipman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:00
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J29/42; B01J29/44; B01J29/405; C; C10; C10G; C10G2400/00; C10G2400/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
91 words
In the process of dewaxing gas oil which comprises contacting such at an elevated temperature with an aluminosilicate zeolite catalyst having a silica to alumina ratio of at least about 12, a constraint index of about 1 to 12 and a crystal density of not substantially below about 1.6 grams per cubic centimeter whereby to reduce the pour point of said gas oil; the improvement which comprises utilizing a catalyst comprising said zeolite having at least one multi valent transition metal and at least one Group VIII noble metal incorporated therewith.
Claim 2
Dependent Claim
91 words
In the process of dewaxing gas oil which comprises contacting such at an elevated temperature with an aluminosilicate zeolite catalyst having a silica to alumina ratio of at least about 12, a constraint index of about 1 to 12 and a crystal density of not substantially below about 1.6 grams per cubic centimeter whereby to reduce the pour point of said gas oil; the improvement which comprises utilizing a catalyst comprising said zeolite having at least one multi valent transition metal and at least one Group VIII noble metal incorporated therewith.
Claim 3
Dependent Claim
12 words
The improved process claimed in claim 1 including operating under hydrogen pressure.
Claim 4
Dependent Claim
81 words
The improved process claimed in claim 1 wherein at least one multi valent transition metal is present in a proportion up to about 2.0 weight percent, at least one Group VIII noble metal is present in a proportion up to about 2.0 weight percent, and both at least one multi valent transition metal and at least one Group VIII noble metal are present in a cumulative proportion up to about 4.0 weight percent all based upon the weight of the zeolite.
Claim 5
Dependent Claim
12 words
The improved process claimed in claim 1 wherein said zeolite is ZSM-5.
Claim 6
Dependent Claim
17 words
The improved process claimed in claim 1 wherein said multi valent transition metal is zinc or cadmium.
Claim 7
Dependent Claim
18 words
The improved process claimed in claim 1 wherein said Group VIII transition metal is platinum palladium or iridium.
Claim 8
Dependent Claim
24 words
The improved process claimed in claim 1 wherein said multi valent transition metal is zinc or said Group VIII noble transition metal is palladium.
References Cited (Backward Citations)
US3700585A
Cited
US3709979A
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US3832449A
Cited
US3766093A
Cited
US3894938A
Cited
US3893906A
Cited
US3894939A
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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) | 1979-09-14 | 1980-03-15 | 1980-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-14 | 1984-03-15 | 1984-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-14 | 1988-03-15 | 1988-09-14 | $7700.00 | Window Closed / Lapsed |