Patent US4510263A successfully refreshed from Google Patents.
US4510263A
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Catalyst with high geometric surface area alumina extrudate and catalyst with high geometric surface area
Assignee: WR Grace and Co Conn
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Filing: 1983-10-17
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Granted: 1985-04-09
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Expires: 2003-10-17
Abstract
Abstract An extrudate suitable for improved gas/liquid contacting is made from a solid, transitional alumina. The cylindrical extrudate has a partially hollow interior and internal reinforcing vanes or ribs extending from the inner wall to the center of the extrudate particle. This extrudate configuration permits the extrudate to have the large geometric surface area per reactor volume yet, because of the openings inside the extrudate, the particles do not exhibit a large pressure drop when packed in a deep bed. One or more Group VI and Group VIII metals can be impregnated to form a catalyst which provides superior desulfurization and demetallization activity than do similar size particles.
Inventors
- 👤 Carmo J. Pereira
- 👤 Louis Hegedus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:21
CPC Classifications
C; C10; C10G; C10G45/00; C10G45/02; C10G45/04; C10G45/06; C10G45/08; B; B01; B01J; B01J35/00; B01J35/50; B01J35/55
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
93 words
A transitional alumina extrudate having a cylindrical hollow annular configuration with internal reinforcing vanes, a nitrogen surface area of at least 50 m 2 /g; a diameter of up to about 6.5 mm; and aspect ratio of the length to the diameter of from about 0.5 to 5; a geometric surface area of at least 25% greater than a hollow tube of the same inside and outside diameter; a porosity of at least 0.3 cm 3 /g; and a surface area per reactor volume of at least 5 cm 2 /cm 3 .
Claim 2
Dependent Claim
93 words
A transitional alumina extrudate having a cylindrical hollow annular configuration with internal reinforcing vanes, a nitrogen surface area of at least 50 m 2 /g; a diameter of up to about 6.5 mm; and aspect ratio of the length to the diameter of from about 0.5 to 5; a geometric surface area of at least 25% greater than a hollow tube of the same inside and outside diameter; a porosity of at least 0.3 cm 3 /g; and a surface area per reactor volume of at least 5 cm 2 /cm 3 .
Claim 3
Dependent Claim
19 words
An extrudate according to claim 1, wherein the number of internal reinforcing vanes meeting in the center is 4.
Claim 4
Dependent Claim
19 words
An extrudate according to claim 1, wherein the number of internal reinforcing vanes meeting in the center is 6.
Claim 5
Dependent Claim
17 words
An extrudate according to claim 1, wherein the surface area is at least 100 m 2 /g.
Claim 6
Dependent Claim
22 words
An extrudate according to claim 1, wherein the surface area per reactor volume is at least 20 cm 2 /cm 3 .
Claim 7
Dependent Claim
16 words
An extrudate according to claim 1, wherein the porosity is at least 0.5 cm 3 /g.
Claim 8
Dependent Claim
16 words
An extrudate according to claim 1, wherein the aspect ratio is from about 0.5 to 2.
Claim 9
Dependent Claim
25 words
An extrudate according to claim 1, wherein the ratio of the wall thickness of the cylinder to the diameter is from about 0.1 to 0.3.
Claim 10
Dependent Claim
25 words
An extrudate according to claim 8, wherein the ratio of the wall thickness of the cylinder to the diameter is from about 0.15 to 0.20.
Claim 11
Dependent Claim
130 words
A catalyst suitable for hydrotreating comprising a solid, transitional alumina extrudate support structure having a cylindrical hollow annular configuration with internal reinforcing vanes, a nitrogen surface area of at least 50 m 2 /g; a diameter of up to about 6.5 mm; an aspect ratio of the length to the diameter of from about 0.5 to 5; a geometric surface area of at least 25% greater than a hollow tube of the same inside and outside diameter; a porosity of at least 0.3 cm 3 /g; a surface area per reactor volume of at least 5 cm 2 /cm 3 and a catalytically-effective amount of one or more Group VI metals or Group VIII metals selected from the group consisting of iron, cobalt and nickel deposited on the support structure.
Claim 12
Dependent Claim
130 words
A catalyst suitable for hydrotreating comprising a solid, transitional alumina extrudate support structure having a cylindrical hollow annular configuration with internal reinforcing vanes, a nitrogen surface area of at least 50 m 2 /g; a diameter of up to about 6.5 mm; an aspect ratio of the length to the diameter of from about 0.5 to 5; a geometric surface area of at least 25% greater than a hollow tube of the same inside and outside diameter; a porosity of at least 0.3 cm 3 /g; a surface area per reactor volume of at least 5 cm 2 /cm 3 and a catalytically-effective amount of one or more Group VI metals or Group VIII metals selected from the group consisting of iron, cobalt and nickel deposited on the support structure.
Claim 13
Dependent Claim
19 words
A catalyst according to claim 10, wherein the number of internal reinforcing vanes meeting in the center is 4.
Claim 14
Dependent Claim
19 words
A catalyst according to claim 10, wherein the number of internal reinforcing vanes meeting in the center is 6.
Claim 15
Dependent Claim
17 words
A catalyst according to claim 10, wherein the surface area is at least 100 m 2 /g.
Claim 16
Dependent Claim
22 words
A catalyst according to claim 10, wherein the surface area per reactor volume is at least 20 cm 2 /cm 3 .
Claim 17
Dependent Claim
16 words
A catalyst according to claim 10, wherein the porosity is at least 0.5 cm 3 /g.
Claim 18
Dependent Claim
16 words
A catalyst according to claim 10, wherein the aspect ratio is from about 0.5 to 2.
Claim 19
Dependent Claim
25 words
A catalyst according to claim 10, wherein the ratio of the wall thickness of the cylinder to the diameter is from about 0.1 to 0.3.
Claim 20
Dependent Claim
25 words
A catalyst according to claim 17, wherein the ratio of the wall thickness of the cylinder to the diameter is from about 0.15 to 0.20.
Claim 21
Dependent Claim
14 words
A catalyst according to claim 10, wherein the metals deposited are cobalt and molybdenum.
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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) | 1988-04-08 | 1988-10-08 | 1989-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-08 | 1992-10-08 | 1993-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-08 | 1996-10-08 | 1997-04-09 | $7700.00 | Window Closed / Lapsed |