B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
252/26
B01J 21/18 (2006.01) C01B 31/12 (2006.01) C01B 31/14 (2006.01)
Patent
CA 1116156
AC1-5 GRANULAR ACTIVATED CARBON MANUFACTURE FROM BROWN COAL TREATED WITH CONCENTRATED INORGANIC ACID WITHOUT PITCH Abstract of the Disclosure Granular activated carbon is manufactured from briquette of about 1" x 2" mesh 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 pre-treated coal briquettes to produce 8/30 mesh granules which are treated by mixing with about 5% by weight of concentrated inorganic acid (H2SO4, H3PO4, or HCl), without the addition of a carbonaceous binder such as coal tar pitch. The so treated granules are ground to form fine powder of more than about 65% by weight -325 mesh powder, more 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 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 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 m2/gram, an iodine number of not less than about 900, an ash content of not more than about 6% by weight, an abrasion number of not less than about 70, an - 1 - apparent density of not less than about 0.48 gram/cc, and a Molasses number of not less than about 200; which properties make them suitable for use in water and waste water treat- ment and in other applications.
312908
Fetherstonhaugh & Co.
Kennecott Corporation
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