Patent FR915329A successfully refreshed from Google Patents.
US4428826A
Expired / Lapsed
US
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Dewaxing and upgrading of raw shale oils
Assignee: Mobil Oil AS
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Filing: 1982-08-19
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Granted: 1984-01-31
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Expires: 2002-08-19
Abstract
Abstract Raw shale oil is selectively dewaxed to lower the pour point by contacting a shale oil charge with a low acid crystalline zeolite. The low acid catalysts can be formed by extensive ion exchange of ZSM-5 type catalysts. The shale oil is dewaxed in the absence of hydrogen at high temperature and low pressure.
Inventors
- 👤 Dennis E. Walsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:23
CPC Classifications
C; C10; C10G; C10G11/00; C10G11/02; C10G11/04; C10G11/05
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
80 words
A process for dewaxing a shale oil and converting the shale oil charge fraction to liquid products of lower boiling range which comprises contacting said charge fraction with a crystalline zeolite characterized by a silica/alumina ratio greater than 12, a constraint index between about 1 and about 12 and an acid activity measured by the alpha scale less than 10, said contacting being conducted at about 450° to about 540° C. and a pressure not greater than about 100 psig.
Claim 2
Dependent Claim
80 words
A process for dewaxing a shale oil and converting the shale oil charge fraction to liquid products of lower boiling range which comprises contacting said charge fraction with a crystalline zeolite characterized by a silica/alumina ratio greater than 12, a constraint index between about 1 and about 12 and an acid activity measured by the alpha scale less than 10, said contacting being conducted at about 450° to about 540° C. and a pressure not greater than about 100 psig.
Claim 3
Dependent Claim
21 words
A process according to claim 1 wherein the ion exchange sites of said zeolite are essentially occupied by alkali metal cations.
Claim 4
Dependent Claim
12 words
A process according to claim 2 wherein said alkali metal is sodium.
Claim 5
Dependent Claim
16 words
A process according to claim 1 wherein said contacting is conducted in the absence of hydrogen.
Claim 6
Dependent Claim
12 words
A process according to claim 1 wherein said zeolite is zeolite ZSM-5.
Claim 7
Dependent Claim
19 words
A process according to claim 1 wherein said contacting is conducted at a pressure less than about 75 psig.
Claim 8
Dependent Claim
14 words
A process according to claim 6 wherein said contacting is conducted at atmospheric pressure.
Claim 9
Dependent Claim
12 words
A process according to claim 3 wherein said zeolite is zeolite ZSM-5.
Claim 10
Dependent Claim
20 words
A process according to claim 4 wherein the ionic exchange sites of zeolite are essentially occupied by alkali metal cations.
Claim 11
Dependent Claim
12 words
A process according to claim 9 wherein said alkali metal is sodium.
Claim 12
Dependent Claim
11 words
A process according to claim 10 wherein said zeolite is ZSM-5.
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) | 1987-01-30 | 1987-08-01 | 1988-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-30 | 1991-08-01 | 1992-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-30 | 1995-08-01 | 1996-01-31 | $7700.00 | Window Closed / Lapsed |