US5356852A
Expired / Lapsed
US
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Activated carbon structures
Assignee: APPLIED TECHNOLOGIES Inc
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Filing: 1993-01-13
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Granted: 1994-10-18
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Expires: 2013-01-13
Abstract
Abstract Thin-walled honeycomb structures of activated carbon, useful for the adsorption of hydrocarbon vapors are prepared without the need for firing or sintering at elevated temperatures. The structures are prepared by forming a substantially homogeneous batch from an admixture of thermally gellable cellulose ether and/or derivative thereof such as methylcellulose, an additional organic binder such as a polyvinyl alcohol resin, and particles of activated carbon; plasticizing the batch with liquid, extruding the batch into a honeycomb shape; and drying the extruded shape at a temperature up to about 225 DEG C.
Inventors
- 👤 Evelyn M. DeLiso
- 👤 Irwin M. Lachman
- 👤 Mallanagouda D. Patil
- 👤 Kenneth E. Zaun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:10
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/28; B01J20/28014; B01J20/28042; B01J20/28045; C; C01; C01B; C01B32/00; C01B32/30; B01J20/02; B01J20/20; B01J20/28026; B01J20/2803; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/30
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
148 words
A method of making a thin-walled honeycomb structure of activated carbon material comprising the steps of (1) admixing into a substantially homogeneous mixture (a) 70-100 parts by weight of particulate activated carbon, (b) 1-15 parts by weight of a first, thermally gellable binder selected from cellulose ethers and derivatives thereof, and (c) 1-10 parts by weight of a second binder selected from the group consisting of polyvinyl alcohol resins, poly(vinylpyrolidone), silicone resins, polyethylene glycol resins, polyethylene oxides, and mixtures of these; (2) adding a plasticizing liquid selected from the group consisting of water, organic solvents, and mixtures thereof to the mixture in an amount sufficient to plasticize the mixture; (3) extruding the plasticized mixture through a die to form a green honeycomb shape of the thin-walled structure; and (4) drying the green honeycomb structure at a temperature up to about 225° C. to form the thin-walled honeycomb structure.
Claim 2
Independent Claim
148 words
A method of making a thin-walled honeycomb structure of activated carbon material comprising the steps of (1) admixing into a substantially homogeneous mixture (a) 70-100 parts by weight of particulate activated carbon, (b) 1-15 parts by weight of a first, thermally gellable binder selected from cellulose ethers and derivatives thereof, and (c) 1-10 parts by weight of a second binder selected from the group consisting of polyvinyl alcohol resins, poly(vinylpyrolidone), silicone resins, polyethylene glycol resins, polyethylene oxides, and mixtures of these; (2) adding a plasticizing liquid selected from the group consisting of water, organic solvents, and mixtures thereof to the mixture in an amount sufficient to plasticize the mixture; (3) extruding the plasticized mixture through a die to form a green honeycomb shape of the thin-walled structure; and (4) drying the green honeycomb structure at a temperature up to about 225° C. to form the thin-walled honeycomb structure.
Claim 3
Dependent Claim
29 words
The method of claim 1 wherein said cellulose ether binder is selected from the group consisting of methylcellulose, ethylcellulose, hydroxybutylcellulose, hydroxybutylmethylcellulose, hydroxyethylcellulose, hydroxymethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, hydroxyethylmethylcellulose, and mixtures thereof.
Claim 4
Dependent Claim
14 words
The method of claim 2 wherein the second binder is a polyvinyl alcohol resin.
Claim 5
Dependent Claim
19 words
The method of claim 1 wherein the drying step is performed at a temperature up to about 200° C.
Claim 6
Dependent Claim
19 words
The method of claim 3 wherein the drying step is performed at a temperature up to about 200° C.
Claim 7
Dependent Claim
31 words
The method of claim 1 wherein the batch comprises about 1-15 weight parts of methyl cellulose, about 1-10 weight parts of polyvinyl alcohol, and about 70-100 weight parts of activated carbon.
Claim 8
Dependent Claim
13 words
The method of claim 6 wherein the polyvinyl alcohol is about 80-95% hydrolyzed.
Claim 9
Dependent Claim
19 words
The method of claim 7 wherein the activated carbon is in a particulate form finer than about 200 mesh.
Claim 10
Dependent Claim
30 words
The method of claim 1 wherein the batch additionally comprises an ether anhydride copolymer and wherein said resinous binder is capable of crosslinking with the copolymer during said drying step.
Claim 11
Dependent Claim
26 words
The method of claim 6 wherein the batch additionally comprises an ether anhydride copolymer capable of cross linking with said polyvinyl alcohol during said drying step.
Claim 12
Dependent Claim
30 words
The method of claim 10 wherein said copolymer is a poly(methyl vinyl ether/maleic anhydride) resin and is present in a molar ratio to polyvinyl alcohol of about 1:1 to 5:1.
Claim 13
Dependent Claim
30 words
The method of claim 11 wherein the batch comprises about 2-10 weight parts of methylcellulose, about 2-5 weight parts of polyvinyl alcohol, and about 85-100 weight parts of activated carbon.
Claim 14
Dependent Claim
53 words
The method of claim 12 wherein said drying step comprises the sub-steps of drying the extruded structure in air at a temperature of about 90°-170° C., followed by further drying said structure in an atmosphere of steam, nitrogen, carbon dioxide, or a mixture of these at a temperature up to about 225° C.
Claim 15
Dependent Claim
41 words
The method of claim 1 wherein the mixture further contains up to about 75% by total weight of a filler selected from the group consisting of silica, alumina, spinels, titania, zirconia, zeolites, other molecular sieves, nitrides, borides, carbides and mixtures thereof.
Claim 16
Dependent Claim
10 words
A honeycomb structure produced by the method of claim 1.
Claim 17
Dependent Claim
10 words
A honeycomb structure produced by the method of claim 15.
Claim 18
Dependent Claim
10 words
A honeycomb structure produced by the method of claim 6.
Claim 19
Dependent Claim
10 words
A honeycomb structure produced by the method of claim 7.
Claim 20
Dependent Claim
10 words
A honeycomb structure produced by the method of claim 9.
Claim 21
Dependent Claim
10 words
A honeycomb structure produced by the method of claim 10.
Claim 22
Dependent Claim
10 words
A honeycomb structure produced by the method of claim 11.
Claim 23
Dependent Claim
10 words
A honeycomb structure produced by the method of claim 12.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-10-17 | 1998-04-18 | 1998-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-17 | 2002-04-18 | 2002-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-17 | 2006-04-18 | 2006-10-18 | $7700.00 | Window Closed / Lapsed |