Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1975-06-11
1977-06-28
Douglas, Winston A.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
252422, 252423, 252445, 423449, 264 291, B01J 2118, C01B 3108, C01B 3110, C01B 3114
Patent
active
040324761
ABSTRACT:
Granular activated carbon is manufactured from sub-bituminous coal by crushing and screening the as received coal containing 17% moisture by weight to produce 8/30 mesh granules which are treated by mixing with about 5% by weight of concentrated inorganic acid (H.sub.2 SO.sub.4, H.sub.3 PO.sub.4 or HCl), without the addition of a carbonaceous binder. The so treated granules are ground to more than 65% by weight -325 mesh powder, preferably 75 to 85% by weight -325 mesh, which powder has a moisture (including acid) content of about 21% by weight, as a temporary binder, and which powder is compressed into pellets of 0.5 inch diameter and 0.5 inch long under a pressure of 40,000 to 80,000 psi, and then granulated to obtain 6/20 mesh granules. These granules are devolatilized by heating to 450.degree. C at 300.degree. C/hour in an atmosphere of N.sub.2 and the volatiles and by maintaining the temperature for 1 hour, and then activated by heating to 800.degree. to 900.degree. C in an atmosphere of N.sub.2 and steam and by maintaining the temperature for 4 to 5 hours. The overall yield of granular activated carbon is 25 to 35% by weight of the dry coal, and the activated granules have a surface area of 900 to 1050 m.sup.2 /gram, an iodine number of 900 to 1100, an ash content of 10 to 12%, an abrasion number of 80, and an apparent density of 0.48 to 0.50 gram/cc, which properties make them suitable for use in waste water treatment and other applications.
REFERENCES:
patent: 1525770 (1925-02-01), Ernst et al.
patent: 1641281 (1927-09-01), Lueg et al.
patent: 3483134 (1969-12-01), Olson
patent: 3630959 (1971-12-01), Kiikka
patent: 3864277 (1975-02-01), Kovach
patent: 3876505 (1975-04-01), Stoneburner
Dougherty David E.
Douglas Winston A.
Konopka P. E.
The Carborundum Company
Weber Robert C.
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