US3901823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Agglomerating activated carbon
Assignee: Westvaco Corp
•
Filing: 1971-11-18
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Granted: 1975-08-26
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Expires: 1991-11-18
Abstract
Abstract Agglomerated activated carbon is prepared by treating activated carbon particles with a water-insoluble lignin binder. The binder is employed in amounts of from 2 to 25 percent by weight based on the carbon. The lignin binder and the carbon particles are mixed together with water to form pellets, then dried to form an agglomerated granular particle.
Inventors
- 👤 Mitchell S Dimitri
- 👤 Albert J Repik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:12
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/28; C; C01; C01B; C01B32/00; C01B32/30; C01B32/354; C01B32/384
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
26 words
ACTIVATED POWDERED CARBON PARTICLES AGGLOMERATED WITH A WATER-INSOLUBLE AMMONIUM SALT OF ALKALI LIGNIN IN AN AMOUNT OF 2 TO 25% BY WEIGHT BASED ON THE CARBON.
Claim 2
Dependent Claim
26 words
ACTIVATED POWDERED CARBON PARTICLES AGGLOMERATED WITH A WATER-INSOLUBLE AMMONIUM SALT OF ALKALI LIGNIN IN AN AMOUNT OF 2 TO 25% BY WEIGHT BASED ON THE CARBON.
Claim 3
Dependent Claim
28 words
Activated carbon particles according to claim 1 wherein said ammonium salt of lignin is present in an amount of 10 to 20% by weight of powdered carbon particles.
Claim 4
Dependent Claim
64 words
Activated powdered carbon particles agglomerated with an alkali lignin obtained by reacting an alkaline solution of alkali lignin with from 0.17 to 2.0 moles of hexamethylene tetramine per mole of lignin at a temperature between 70*C. and 180*C., said lignin dried to form products having large surface areas present in an amount of from 2 to 25% by weight based on a powdered carbon.
Claim 5
Dependent Claim
64 words
Activated powdered carbon particles agglomerated with an alkali lignin obtained by reacting an alkaline solution of alkali lignin with from 0.17 to 2.0 moles of hexamethylene tetramine per mole of lignin at a temperature between 70*C. and 180*C., said lignin dried to form products having large surface areas present in an amount of from 2 to 25% by weight based on a powdered carbon.
Claim 6
Dependent Claim
26 words
Activated carbon particles according to claim 3 wherein said alkali lignin is present in an amount of 10 to 20% by weight of said powdered carbon.
Claim 7
Independent Claim
120 words
A METHOD OF PRODUCING ACTIVATED CARBON PARTICLES WHICH COMPRISES: A. ADDING POWDERED ACTIVATED CARBON PARTICLES TO WATER CONTAINING FROM 2 TO 25% BY WEIGHT OF SAID POWDERED CARBON OF THE AMMONIUM SALT OF AN ALKALI LIGNIN, SAID WATER BEING AT LEAST 70% BY WEIGHT BASED ON SAID LIGNIN AND SAID CARBON TOGETHER, B. INTIMATELY MIXING SAID POWDERED CARBON PARTICLES, AMMONIUM SALT OF ALKALI LIGNIN AND WATER TO COAT EACH POWDERED CARBON PARTICLE WITH SAID AMMONIUM SALT OF ALKALI LIGNIN, C. CONTINUING SAID MIXING UNTIL SAID POWDERED CARBON PARTICLES FORM AGGLOMERATES OF ABOUT 1/6 TO 1/4 INCH DIAMETER SPHERES, AND D. EVAPORATING THE WATER FROM SAID AGGLOMERATES AT A TEMPERATURE BELOW THE DECOMPOSITION TEMPERATURE OF SAID AMMONIUM SALT OF ALKALI LIGNIN.
Claim 8
Independent Claim
120 words
A METHOD OF PRODUCING ACTIVATED CARBON PARTICLES WHICH COMPRISES: A. ADDING POWDERED ACTIVATED CARBON PARTICLES TO WATER CONTAINING FROM 2 TO 25% BY WEIGHT OF SAID POWDERED CARBON OF THE AMMONIUM SALT OF AN ALKALI LIGNIN, SAID WATER BEING AT LEAST 70% BY WEIGHT BASED ON SAID LIGNIN AND SAID CARBON TOGETHER, B. INTIMATELY MIXING SAID POWDERED CARBON PARTICLES, AMMONIUM SALT OF ALKALI LIGNIN AND WATER TO COAT EACH POWDERED CARBON PARTICLE WITH SAID AMMONIUM SALT OF ALKALI LIGNIN, C. CONTINUING SAID MIXING UNTIL SAID POWDERED CARBON PARTICLES FORM AGGLOMERATES OF ABOUT 1/6 TO 1/4 INCH DIAMETER SPHERES, AND D. EVAPORATING THE WATER FROM SAID AGGLOMERATES AT A TEMPERATURE BELOW THE DECOMPOSITION TEMPERATURE OF SAID AMMONIUM SALT OF ALKALI LIGNIN.
Claim 9
Dependent Claim
66 words
The method of claim 5 which further comprises, e. heating said agglomerates from which the water has been evaporated in step (d) above the decomposition temperature of said ammonium salt of alkali lignin thereby to decompose the ammonium salt of alkali lignin into ammonia and a free acid alkali lignin bound carbon agglomerate, and f. separating said ammonia from said free acid alkali lignin bound agglomerate.
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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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |