US4535005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Consolidating the surface of a granular adsorbent
Assignee: BASF SE
•
Filing: 1983-03-09
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Granted: 1985-08-13
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Expires: 2003-03-09
Abstract
Abstract A process for consolidating the surface of a granular adsorbent, wherein a water-containing adsorbent, which has taken up 25-70% by weight of the maximum possible amount of water, is heated to a temperature at which the water taken up evaporates, and is at the same time treated with an aqueous dispersion of a self-crosslinking copolymer, and the adsorbent thus coated is heated to a temperature at which the copolymer crosslinks. The coated adsorbent has virtually the same adsorption and desorption properties as the untreated adsorbent, but in contrast exhibits substantially improved abrasion resistance.
Inventors
- 👤 Franz Haas
- 👤 Gerhard Janisch
- 👤 Gerold Schreyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:59
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/20; B01J20/22; B01J20/26; B01J20/261; B01J20/264; B01J20/265; B01J20/267; B01J20/28; B01J20/28002; B01J20/28004; B01J20/28011; B01J20/28054; B01J20/28057; B01J20/30; B01J20/32; B01J20/3202; B01J20/3204; B01J20/3231; B01J20/3242; B01J20/3268; B01J20/327; B01J20/3276; B01J20/328; B01J20/3282; C; C01; C01B; C01B32/00; C01B32/30; C01B32/354; C01B32/372; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
114 words
A process for consolidating the surface of a granular adsorbent, wherein the adsorbent, which initially contains virtually no water, (1) is treated with 25-70% by weight of the maximum possible amount of water which it can take up to saturation, (2) is heated to a temperature at which the water taken up evaporates, (3) and is treated, while water taken up is evaporating, with an aqueous dispersion of a self-crosslinking copolymer, while mixing, the ratio of the weight of copolymer adhering to the adsorbent to the weight of adsorbent being from 2:98 to 30:70 and, (4) the adsorbent thus coated is heated at from 110° to 180° C. in order to crosslink the copolymer.
Claim 2
Dependent Claim
114 words
A process for consolidating the surface of a granular adsorbent, wherein the adsorbent, which initially contains virtually no water, (1) is treated with 25-70% by weight of the maximum possible amount of water which it can take up to saturation, (2) is heated to a temperature at which the water taken up evaporates, (3) and is treated, while water taken up is evaporating, with an aqueous dispersion of a self-crosslinking copolymer, while mixing, the ratio of the weight of copolymer adhering to the adsorbent to the weight of adsorbent being from 2:98 to 30:70 and, (4) the adsorbent thus coated is heated at from 110° to 180° C. in order to crosslink the copolymer.
Claim 3
Dependent Claim
19 words
A process as claimed in claim 1, wherein the self-crosslinking copolymer contains N-methylol and/or N-methylol-ether groups as copolymerized structures.
Claim 4
Dependent Claim
15 words
A process as claimed in claim 1 or 2, wherein a heat-sensitized dispersion is employed.
Claim 5
Dependent Claim
39 words
A granular active carbon, having an inner surface area of 400-1600 m 2 /g and a mean particle diameter of 0.3-9 mm, wherein the surface of the particles has been consolidated by the process as claimed in claim 1.
References Cited (Backward Citations)
US2988782A
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US3544507A
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US4081402A
Cited
US4112185A
Cited
US4171283A
Cited
GB2063228A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |