Activated carbon products and their manufacture
AssigneeCharcoal Cloth Ltd.
InventorFrederick A. P. Maggs
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Abstract
An activated carbon product such as a charcoal cloth or felt has, in addition to any activating material, a metal uniformly dispersed therein. The metal may be catalytic or bactericidal, and a particularly preferred product of the invention contains silver and is suitable for use as a surgical dressing. Such products can be produced by a conventional activation procedure using a mixture of halides, even if the further metal halide is substantially insoluble in the impregnation solution used for activation, by incorporating in the solution ammonia and a sequestering agent such as citric acid.
Claims4
A process for the preparation of an activated charcoal cloth or felt which comprises treating a fibrous carbohydrate material with a solution of at least one Lewis acid halide selected from the halides of Zn, Al, Ca, Mg and Fe;
- a compound of a second metal element whose halide is relatively insoluble with respect to the, or the mixture of, Lewis acid halides;
- ammonia;
- and a sequestering agent;
- and then drying, carbonising and activating the carbohydrate material.
Dependencies are inferred from the claim text.