Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1977-07-25
1978-12-26
Konopka, P. E.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
252421, 252422, 252444, C01B 3110, C01B 3108, B01J 2118
Patent
active
041315669
ABSTRACT:
Granular activated carbon is manufactured from low rank agglomerating but not good coking bituminous coal by crushing and screening the as received coal to produce 8/30 mesh granules, which are treated with a dilute aqueous solution of inorganic acid to prevent fusion of the granules during subsequent devolatilization comprising: mixing the granules with the acid (H.sub.2 SO.sub.4, H.sub.3 PO.sub.4, HCl or mixtures thereof) at a concentration of about 1% to about 15% by weight, washing off the acid, drying the granules thoroughly and thereafter mixing the granules with about 5 to about 15% by weight of a carbonaceous binder such as coal tar pitch. The so treated granules are ground to at least about 65% by weight -325 mesh powder, which is compressed into shapes such as 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 first charred by heating to 250.degree. C at 150.degree. C/hour in an atmosphere of air and nitrogen and by maintaining the temperature for 4 hours, next 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 activated granules have a surface area of 1050 to 1090 m.sup.2 /gram, an Iodine number of 900 to 1100, an ash content of 6 to 9%, an abrasion number 75 to 80, and an apparent density of 0.51 to 0.53 gram/cc, which properties make them suitable for use in water and waste water treatment and in other applications.
REFERENCES:
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patent: 3843134 (1974-10-01), Olson
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patent: 3876505 (1975-04-01), Stoneburner
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patent: 4039473 (1977-08-01), Shafer
Dougherty David E.
Konopka P. E.
The Carborundum Company
Weber Robert C.
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