Process for making activated carbon with control of metal ion concentration in phosphoric acid
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United States of America
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Nov 30, 1982
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Jun 4, 1981
filing date -
May 10, 1978
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Abstract
A process for improvement of wood-base active carbon made in the presence of phosphoric acid is disclosed herein. The improvement comprises controlling the amount of dissolved salts of the group sodium, potassium, calcium and magnesium in the process acid to provide a metal ion concentration from 0.5% to 2.0% by weight. The controlled addition of these metal salts improves the adsorptivity for fuel vapors and the decolorizing activity of the carbon.
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