Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1978-03-06
1979-03-13
Douglas, Winston A.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
252422, 252423, 423449, B01J 2118, C01B 3112, C01B 3110
Patent
active
041441931
ABSTRACT:
Granular activated carbon is manufactured from sub-bituminous coal by crushing and screening the as received coal containing about 10 to about 25% moisture by weight to produce 8/30 mesh granules, treating the granules with a dilute aqueous solution of inorganic acid at a concentration from about 1 to about 25% by weight to reduce the volatile content and thereby increase the fixed carbon content, the particular concentration being selected to provide the desired activity and porosity of the activated carbon, 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. The granules are mixed with from 0 to about 15% by weight of coal tar pitch. The so treated granules are ground to form fine powder of not less than about 60% by weight -325 mesh, preferably more than about 65% by weight -325 mesh, which is compressed into shapes, such as pellets or thin corrugated sheets under high pressure, and then granulated to reform 6/20 mesh granules. These reformed granules are devolatilized, without prior 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.
REFERENCES:
patent: 3483134 (1969-12-01), Olson
patent: 3623999 (1971-11-01), Jungten
patent: 3876505 (1975-04-01), Stoneburner
patent: 3998604 (1976-12-01), Hinkley
patent: 4014817 (1977-03-01), Johnson et al.
patent: 4039473 (1977-08-01), Shaffer
patent: 4083801 (1978-04-01), Das
Dougherty David E.
Douglas Winston A.
Konopka P. E.
The Carborundum Company
Weber Robert C.
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