US4376036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of high V. I. lubricating oil stock
Assignee: Mobil Oil AS
•
Filing: 1981-03-06
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Granted: 1983-03-08
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Expires: 2001-03-06
Abstract
Abstract A process for the manufacture of high quality lubricating oils having a high viscosity index and low pour point is disclosed which comprises catalytically dewaxing a lubricating oil stock by contacting the same in the presence of hydrogen over a zeolite such as ZSM-5 which has been silica-modified.
Inventors
- 👤 William E. Garwood
- 👤 Paul G. Rodewald
- 👤 Nai Y. Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:14
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J21/00; B01J21/06; B01J21/08; B01J2229/00; B01J2229/10; B01J2229/26; B01J2229/30; B01J2229/42; B01J29/70; C; C10; C10G; C10G2400/00; C10G2400/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
128 words
In a process for catalytically hydrodewaxing a lubricating oil stock containing high pour point waxy paraffins by contacting the same in the presence of added hydrogen at elevated temperatures and pressures with a catalyst composition comprising a binder and a crystalline aluminosilicate zeolite having a silica to alumina ratio of at least about 12 and a constraint index within the approximate range of 1 to 12, the improvement which comprises carrying out said hydrodewaxing with said zeolite which has been silica-modified by the addition of at least 0.1% by weight silica to said catalyst from the reaction of said catalyst with silicones or silanes so as to enhance the selectivity of the catalyst for said high pour waxy paraffins and recovering a product having an enhanced viscosity index.
Claim 2
Dependent Claim
128 words
In a process for catalytically hydrodewaxing a lubricating oil stock containing high pour point waxy paraffins by contacting the same in the presence of added hydrogen at elevated temperatures and pressures with a catalyst composition comprising a binder and a crystalline aluminosilicate zeolite having a silica to alumina ratio of at least about 12 and a constraint index within the approximate range of 1 to 12, the improvement which comprises carrying out said hydrodewaxing with said zeolite which has been silica-modified by the addition of at least 0.1% by weight silica to said catalyst from the reaction of said catalyst with silicones or silanes so as to enhance the selectivity of the catalyst for said high pour waxy paraffins and recovering a product having an enhanced viscosity index.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein said silica-modified zeolite contains a substantial portion of the silica on the external surface thereof.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein said silica-modified zeolite has a portion of said silica within its interior crystalline structure.
Claim 5
Dependent Claim
13 words
The process of claim 2 wherein said zeolite is in the hydrogen form.
Claim 6
Dependent Claim
13 words
The process of claim 3 wherein said zeolite is in the hydrogen form.
Claim 7
Dependent Claim
11 words
The process of claim 4 wherein said silica-modified zeolite is HZSM-5.
Claim 8
Dependent Claim
11 words
The process of claim 4 wherein said silica-modified zeolite is HZSM-11.
Claim 9
Dependent Claim
11 words
The process of claim 4 wherein said silica-modified zeolite is HZSM-12.
Claim 10
Dependent Claim
11 words
The process of claim 5 wherein said silica-modified zeolite is HZSM-5.
Claim 11
Dependent Claim
11 words
The process of claim 5 wherein said silica-modified zeolite is HZSM-11.
Claim 12
Dependent Claim
11 words
The process of claim 5 wherein said silica-modified zeolite is HZSM-12.
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) | 1986-03-07 | 1986-09-06 | 1987-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-07 | 1990-09-06 | 1991-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-07 | 1994-09-06 | 1995-03-08 | $7700.00 | Window Closed / Lapsed |