Patent US4990243A successfully refreshed from Google Patents.
US4990243A
Expired / Lapsed
US
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Process for hydrodenitrogenating hydrocarbon oils
Assignee: Chevron USA Inc
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Filing: 1989-05-10
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Granted: 1991-02-05
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Expires: 2009-05-10
Abstract
Abstract This invention provides a layered catalyst system for hydro-denitrification of hydrocarbons, such as vacuum gas oil, used for hydrocracking to produce various fuels. The layered catalyst system of this invention comprises a first layer of a nickel-molybdenum-phosphorus/alumina catalyst or a cobalt-molybdenum-phosphorus/alumina catalyst and a second layer catalyst comprising a nickel-tungsten/silica-alumina-zeolite or a nickel-molybdenum/silica-alumina-zeolite catalyst. The preferred aspects of the combination of the layered catalysts disclosed herein are: (a) the first layer alumina catalyst has a molybdenum content greater than about 14% by wt.; (b) the first layer alumina catalyst has a relatively large pore size, such as at least about 60 Å; and (c) the second layer catalyst contains at least about 2% of a zeolite component. The layered catalyst system of this invention and the attendant process produces improved denitrification of feedstocks, improved catalyst life and other advantages.
Inventors
- 👤 Philip L. Winslow
- 👤 Richard F. Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:50
CPC Classifications
C; C10; C10G; C10G65/00; C10G65/02; C10G65/04; B; B01; B01J; B01J27/00; B01J27/14; B01J27/186; B01J27/188; B01J29/00; B01J29/04; B01J29/06; B01J29/076; B01J35/00; B01J35/60; B01J35/64; B01J35/647; B01J37/00; B01J37/20
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
112 words
A process for denitrification of hydrocarbon oils comprising contacting the hydrocarbon oils with hydrogen in the presence of a layered catalyst comprising a first layer of a catalyst which comprises a catalyst selected from the group consisting of a nickel-molybdenum-phosphorus/alumina catalyst and a cobalt-molybdenum-phosphorus/alumina catalyst having a molybdenum content greater than about 14% by weight of the first layer catalyst and having an average pore size of at least about 60 Å and comprising a second layer of a catalyst which comprises a catalyst selected from the group consisting of a nickel-tungsten/silica-alumina-zeolite and a nickel-molybdenum/silica-alumina-zeolite catalyst, wherein the zeolite component comprises at least about 2% by weight of the second layer catalyst.
Claim 2
Dependent Claim
112 words
A process for denitrification of hydrocarbon oils comprising contacting the hydrocarbon oils with hydrogen in the presence of a layered catalyst comprising a first layer of a catalyst which comprises a catalyst selected from the group consisting of a nickel-molybdenum-phosphorus/alumina catalyst and a cobalt-molybdenum-phosphorus/alumina catalyst having a molybdenum content greater than about 14% by weight of the first layer catalyst and having an average pore size of at least about 60 Å and comprising a second layer of a catalyst which comprises a catalyst selected from the group consisting of a nickel-tungsten/silica-alumina-zeolite and a nickel-molybdenum/silica-alumina-zeolite catalyst, wherein the zeolite component comprises at least about 2% by weight of the second layer catalyst.
Claim 3
Dependent Claim
15 words
A process according to claim 1 wherein the first layer catalyst comprises a nickel-molybdenum-phosphorous/alumina catalyst.
Claim 4
Dependent Claim
15 words
A process according to claim 1 wherein the second layer catalyst further comprises titanium oxide.
Claim 5
Dependent Claim
26 words
A process according to claim 3 wherein the first layer catalyst comprises a gamma alumina having an average pore size of at least about 70 Å.
Claim 6
Dependent Claim
27 words
A process according to claim 3 wherein the second layer catalyst zeolite component comprises from about 3 to about 20% by weight of the second layer catalyst.
Claim 7
Dependent Claim
27 words
A process according to claim 4 wherein the second layer catalyst zeolite component comprises from about 3 to about 20% by weight of the second layer catalyst.
Claim 8
Dependent Claim
23 words
A process according to claim 1 wherein the first layer catalyst has an average pore size from about 75 to about 120 Å.
Claim 9
Dependent Claim
23 words
A process according to claim 2 wherein the first layer catalyst has an average pore size from about 75 to about 120 Å.
Claim 10
Dependent Claim
23 words
A process according to claim 3 wherein the first layer catalyst has an average pore size from about 75 to about 120 Å.
Claim 11
Dependent Claim
23 words
A process according to claim 6 wherein the first layer catalyst has an average pore size from about 75 to about 120 Å.
Claim 12
Dependent Claim
12 words
A process according to claim 1 wherein the layered catalyst is presulfided.
Claim 13
Dependent Claim
14 words
A process according to claim 1 wherein the hydrocarbon is a vacuum gas oil.
Claim 14
Dependent Claim
14 words
A process according to claim 3 wherein the hydrocarbon is a vacuum gas oil.
Claim 15
Dependent Claim
14 words
A process according to claim 11 wherein the hydrocarbon is a vacuum gas oil.
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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) | 1994-02-04 | 1994-08-06 | 1995-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-04 | 1998-08-06 | 1999-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-04 | 2002-08-06 | 2003-02-05 | $7700.00 | Window Closed / Lapsed |