Method of making activated carbon

Details Method of making activated carbon Method of making activated carbon

1979-03-07

1981-05-19

Konopka, P. E.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

201 6, 252445, 264117, C01B 3110, C01B 3114, B01J 2030, B01J 2118

Patent

active

042684170

ABSTRACT:
Activated carbon is made by forming a slurry of carbonaceous and non-carbonaceous fine particles, preferably finely divided non-caking coal, in a suspension liquid, preferably water, comprised of at least 60 percent suspension liquid by weight. Preferably, the geometric mean particle size of the fine particles dispersed in the suspension liquid is less than 150 microns. A free-flowing liquid, which is liquid below 80.degree. C. and preferably below 20.degree. C., lyophobic to the suspension liquid and the non-carbonaceous fine particles and lyophilic to the carbonaceous fine particles, is added to the slurry to form a mixture where less than 20 percent by weight of the free-flowing liquid and the carbonaceous and non-carbonaceous fine particles is free-flowing liquid. The resulting mixture is then agitated to preferentially agglomerate the carbonaceous fine particles to form discrete agglomerates, while the non-carbonaceous fine particles remain substantially unagglomerated in the slurry. The discrete agglomerates of carbonaceous material are thereafter separated from the mixture, and carbonized by heating to greater than about 400.degree. C. Then the separated discrete agglomerates are activated to form activated carbon preferably by heating to greater than 800.degree. C. in the presence of steam, carbon dioxide or flue gas.

REFERENCES:
patent: 1478986 (1923-12-01), Morrell
patent: 2008145 (1935-07-01), Morrell
patent: 2040931 (1936-05-01), Fuchs
patent: 3483134 (1969-12-01), Olsoh
patent: 3533961 (1970-10-01), Voet et al.
patent: 3541025 (1970-11-01), Oda et al.
patent: 3623999 (1971-11-01), Jungten
patent: 3637464 (1972-01-01), Walsh et al.
patent: 3998604 (1976-12-01), Hinkley

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