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AssigneeWestvaco Corporation
InventorsFrederick S. Baker, Robert K. Beckler, James R. Miller, Zhiquan Quentin Yan
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A process for further chemical activation of activated carbon is disclosed comprising activation of an active carbon precursor material with a potassium hydroxide solution, pre-drying the blend to 5% to 15% moisture content, activating this blend at from about 650.degree. to about 1100.degree. C., and acid washing and drying the microporous activated carbon product, which is characterized by greater than 50% of its total pore volume comprising pores of from about 8.ANG. to 20.ANG. in width and greater than 70% of its total pore volume comprising pores of less than 20.ANG. in width and greater than 95% of its total pore volume comprising pores of less than 50.ANG. in width.
A process for the manufacture of highly microporous activated carbon comprising the steps of forming a wet blend of an activated carbon material and an alkali solution at a ratio of from 0.5:1 to 5:1, on a dry weight basis, pre-drying the wet blend to a moisture content of below about 25%, heat treating the blend at from about 650.degree. to about 1100.degree. C., and acid washing and drying the microporous activated carbon product.
Dependencies are inferred from the claim text.