Granular activated carbon manufacture from brown coal treated wi

Details Granular activated carbon manufacture from brown coal treated wi Granular activated carbon manufacture from brown coal treated wi

1977-12-02

1979-04-17

Douglas, Winston A.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252422, 252423, 252445, 423449, B01J 2118, C01B 3108, C01B 3110, C01B 3114

Patent

active

041499948

ABSTRACT:
Granular activated carbon is manufactured from briquettes of about 1".times.2", formed from brown coal, from which iron material has been extracted and which has a moisture content of about 15% by weight, by crushing and screening the pretreated coal briquettes to produce 8/30 mesh granules, treating the granules with a dilute aqueous solution of inorganic acid (H.sub.2 SO.sub.4, H.sub.3 PO.sub.4 or HCl) at a concentration of about 1 to about 10% by weight to reduce the volatile content and thereby increase the fixed carbon content comprising: mixing the granules with the acid, washing off the acid, and drying the granules at least partially to a moisture content below about 25% by weight. In one case the washed granules are dried partially to a moisture content of about 10 to about 25% by weight without the addition of a carbonaceous binder such as coal tar pitch. In the other case the granules are dried thoroughly and mixed with about 5 to about 15% by weight of coal tar pitch. The so treated granules are ground to form fine powder of more than about 65% by weight -325 mesh, more preferably 75 to 85% by weight -325 mesh, which is compressed into shapes such as pellets of 0.5" diameter and 0.5" long under a pressure of 40,000 to 80,000 psi, and then granulated to obtain 6/20 mesh granules. These reformed granules are devolatilized, without charring, by directly heating to and at a temperature higher than the charring temperature in an oxygen-free atmosphere, and then activated by heating to and at a temperature higher than the devolatilizing temperature in an atmosphere containing a gaseous activating agent. The overall yield of granular activated carbon is not less than about 22% by weight, dry basis, and the activated granules have a surface area of not less than about 900 m.sup.2 /gram, an Iodine number of not less than about 900, an ash content of not more than about 7% by weight, an abrasion number of not less than about 70, an apparent density of not less than about 0.46 gram/cc, and a Molasses number of not less than about 200; which properties make them suitable for use in water and waste water treatment and in other applications.

REFERENCES:
patent: 3483134 (1969-12-01), Olson
patent: 3623999 (1971-11-01), Jungten
patent: 3876505 (1975-04-01), Stoneburner
patent: 3993456 (1976-11-01), Cole et al.
patent: 3998604 (1976-12-01), Hinkley
patent: 4014817 (1977-03-01), Johnson et al.
patent: 4032476 (1977-06-01), Murty
patent: 4039473 (1977-08-01), Shafer

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