Patent US4755499A successfully refreshed from Google Patents.
US4755499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sorbent for removing nitrogen oxides, sulfur oxides and hydrogen sulfide from gas streams
Assignee: Noxso Corp
•
Filing: 1986-09-09
•
Granted: 1988-07-05
•
Expires: 2006-09-09
Abstract
Abstract Novel sorbents comprising (a) an alumina substrate having a pore volume between 0.4 and 0.8 cc/g, and (b) an alkali or alkaline earth component, for example, sodium carbonate, wherein the amount of the alkali or alkaline earth component is between 50 and 400 μg per m 2 of the substrate. The sorbents of the present invention are outstandingly effective for the removal of nitrogen oxides, sulfur oxides and hydrogen sulfide from waste gas streams.
Inventors
- 👤 Lewis G. Neal
- 👤 John L. Haslbeck
- 👤 Hsiaopin Tseng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:42
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/06; B01D53/10; B01D53/12; B01J; B01J20/00; B01J20/02; B01J20/06; B01J20/08; B01D2251/00; B01D2251/60; B01D2251/604; B01D2253/00; B01D2253/10; B01D2253/104; B01D2253/25; B01D2253/30; B01D2253/302; B01D2253/306; B01D2253/308; B01D2257/00; B01D2257/30; B01D2257/302; B01D2257/304; B01D2257/40; B01D2257/404; Y; Y10; Y10S; Y10S502/00; Y10S502/50; Y10S502/504
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
142 words
A regenerable attrition resistant sorbent useful in a fluidized bed for the removal of gaseous nitrogen oxides, sulfur oxides and hydrogen sulfide from waste gas streams, which sorbent comprises (a) a gamma alumina substrate having a surface area between 100 m 2 /g and 500 m 2 /g and a pore volume between 0.4 and 0.8 cc/g, said gamma alumina substrate having a bimodal pore size distribution comprising micropores and macropores, said micropores having an average pore diameter d 1 in the range of between 30 and 400 Angstroms and said macropores having an average pore diameter d 2 in the range of between 80 and 3000 Angstroms, and (b) an alkali metal component, said substrate impregnated with said alkali metal component and the amount of said alkali metal component being between 50 and 400 μg per m 2 of said substrate.
Claim 2
Dependent Claim
142 words
A regenerable attrition resistant sorbent useful in a fluidized bed for the removal of gaseous nitrogen oxides, sulfur oxides and hydrogen sulfide from waste gas streams, which sorbent comprises (a) a gamma alumina substrate having a surface area between 100 m 2 /g and 500 m 2 /g and a pore volume between 0.4 and 0.8 cc/g, said gamma alumina substrate having a bimodal pore size distribution comprising micropores and macropores, said micropores having an average pore diameter d 1 in the range of between 30 and 400 Angstroms and said macropores having an average pore diameter d 2 in the range of between 80 and 3000 Angstroms, and (b) an alkali metal component, said substrate impregnated with said alkali metal component and the amount of said alkali metal component being between 50 and 400 μg per m 2 of said substrate.
Claim 3
Dependent Claim
25 words
The sorbent of claim 1, wherein said amount of said alkali metal component is between 100 and 350 μg per m 2 of said substrate.
Claim 4
Dependent Claim
25 words
The sorbent of claim 1, wherein said amount of said alkali metal component is between 150 and 250 μg per m 2 of said substrate.
Claim 5
Dependent Claim
23 words
The sorbent of claim 1, wherein said macropores of said substrate have an average pore diameter d 2 of 100 and 1000 Angstroms.
Claim 6
Dependent Claim
23 words
The sorbent of claim 1, wherein said macropores of said substrate have an average pore diameter d 2 of 200 and 500 Angstroms.
Claim 7
Dependent Claim
21 words
The sorbent of claim 1 wherein said micropores have an average pore diameter d 1 of between 60 and 200 Angstroms.
Claim 8
Dependent Claim
21 words
The sorbent of claim 1 wherein said micropores have an averge pore diameter d 1 of between 80 and 100 Angstroms.
Claim 9
Dependent Claim
15 words
The sorbent of claims 1 wherein said pore volume is between 0.6 and 0.8 cc/g.
Claim 10
Dependent Claim
24 words
The sorbent of claim 1, wherein said alkali metal component is selected from the group consisting of sodium, lithium, potassium, rubidium, cesium and francium.
Claim 11
Dependent Claim
12 words
The sorbent of claim 9, wherein said alkali metal component is sodium.
Claim 12
Dependent Claim
12 words
The sorbent of claim 9 wherein said alkali metal component is potassium.
Claim 13
Dependent Claim
91 words
A regenerable attrition resistant sorbent useful in a fluidized bed for the removal of gaseous nitrogen oxides, sulfur oxides and hydrogen sulfide from waste gas streams, which sorbent comprises: (a) a gamma alumina substrate having a surface area between 100 m 2 /g and 500 m 2 /g and a pore volume between 0.6 and 0.8 cc/g, and (b) an alkali metal component, said substrate impregnated with said alkali metal component and the amount of said alkali metal component being between 150 and 250 μg per m 2 of said substrate.
Claim 14
Dependent Claim
91 words
A regenerable attrition resistant sorbent useful in a fluidized bed for the removal of gaseous nitrogen oxides, sulfur oxides and hydrogen sulfide from waste gas streams, which sorbent comprises: (a) a gamma alumina substrate having a surface area between 100 m 2 /g and 500 m 2 /g and a pore volume between 0.6 and 0.8 cc/g, and (b) an alkali metal component, said substrate impregnated with said alkali metal component and the amount of said alkali metal component being between 150 and 250 μg per m 2 of said substrate.
Claim 15
Dependent Claim
24 words
The sorbent of claim 12, wherein said alkali metal component is selected from the group consisting of sodium, lithium, potassium, rubidium, cesium and francium.
References Cited (Backward Citations)
CH88554A
Cited
US2684283A
Cited
US2992884A
Cited
US3065056A
Cited
US3260679A
Cited
US3291564A
Cited
US3382033A
Cited
US3411865A
Cited
US3398131A
Cited
US3492083A
Cited
US3498743A
Cited
US3410909A
Cited
GB1154009A
Cited
US3589863A
Cited
US3557025A
Cited
US3551093A
Cited
US3669617A
Cited
US3632314A
Cited
US3755556A
Cited
US3660032A
Cited
US3725531A
Cited
US3682585A
Cited
US3864450A
Cited
US3755535A
Cited
US3974096A
Cited
US4426365A
Cited
US4323544A
Cited
US3948809A
Cited
US3880618A
Cited
US3957952A
Cited
DE2419103A1
Cited
US4071436A
Cited
US4315839A
Cited
US4301037A
Cited
US4493715A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-05 | 1992-01-04 | 1992-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-05 | 1996-01-04 | 1996-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-05 | 2000-01-04 | 2000-07-05 | $7700.00 | Window Closed / Lapsed |