Activated nutshell carbons from agricultural waste

Details Activated nutshell carbons from agricultural waste Activated nutshell carbons from agricultural waste

1997-05-29

2000-03-07

Simmons, David A.

Liquid purification or separation

Processes

Ion exchange or selective sorption

502423, 502428, C01B 3112, B01J 2020

Patent

active

060335734

ABSTRACT:
Activated carbons derived from nutshells, and for use in adsorption of metallic cations, are prepared utilizing phosphoric acid activation with concurrent oxidation under air. The acid activation is carried out utilizing a one or two-step heating regime subsequent to the infusion of the phosphoric acid into the nutshell material during which concurrent oxidation is achieved by exposure to atmospheric oxygen. Further oxidation is optionally achieved by equilibration of the nutshell carbons to room temperature under air. Prior to utilization, a washing step is employed to remove unwanted acid from the carbon product.

REFERENCES:
patent: 4760046 (1988-07-01), Burger et al.
patent: 5206207 (1993-04-01), Tolles
patent: 5276000 (1994-01-01), Matthews et al.
patent: 5304527 (1994-04-01), Dimitri

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