Activated carbons from low-density agricultural waste.
Authors:
Johns, M.M. Toles, C.A. Marshall, W.E. USDA
Source:
United States Department of Agriculture patents. 2003 Mar. 25, no. US 6,537,947 B1, 5 p.
NALT Subjects:
patents USDA activated carbon lignocellulosic wastes lignocellulose carbon dioxide adsorption metals ions new methods agricultural wastes plant residues molasses soybeans hulls straw adsorbents United States
Issue Date:
25-Mar-2003
Abstract:
Activated carbons derived from low-density lignocellulosic agricultural waste, and for use in absorption of metals, are prepared utilizing carbon dioxide or steam activation at 800° C. to 950° C. for 3 to 12 hours and subsequent oxidation with air at 260° C. to 400° C. for 3 to 6 hours. Granular carbons are formed by the inclusion of a preliminary two-step process involving the admixture of a binder selected from molasses, coal tar or wood tar to form pellets, briquettes or extrudates and converting them into a char under an inert atmosphere at 700° C. to 750° C. for 1 to 2 hours.
