Coated activated carbon for contaminant removal from a fluid stream
AssigneeWestvaco Corporation
InventorsLaurence H. Hiltzik, Edward D. Tolles, David R. B. Walker
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Abstract
Product attrition by dusting of granular and shaped activated carbons is disclosed to be reduced significantly, or essentially eliminated, by the application of a thin, continuous polymer coating on the granular or shaped activated carbon, without a reduction in adsorption velocity or capacity of the activated carbon when used in fluid stream filters for removing contaminants. The avoidance of carbon dust leads to improved fluid stream filter performance in contaminant removal.
Claims19
A method for capturing contaminants from a fluid stream containing same by routing said stream through a filter comprising an activated carbon material having its surface coated with a continuous film of a polymer, said polymer film being operable for essentially eliminating attrition of the activated carbon material resulting from dusting.
A method for capturing chlorine from a fluid stream containing same by routing said stream through a filter comprised of a polymer-coated activated carbon prepared by coating the activated carbon material according to the steps of:
- (a) spraying an emulsion of the polymer onto exposed surfaces of the activated carbon material while it is in a state of turbulence at a processing temperature above ambient temperature;
- and
- (b) drying the coated activated carbon material at above ambient temperature.
The method of claim 20 wherein the lignocellulosic materials are selected from the group consisting of including pulp, paper, residues from pulp production, wood chips, sawdust, wood flour, nut shell, kernel, and fruit pits.
Dependencies are inferred from the claim text.