Process for treating activated carbon with aqueous ammonia
AssigneeKureha Kagaku Kogyo Kabushiki Kaisha
InventorYasushi Nishimura
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Abstract
Activated carbon, useful in a pharmaceutical composition for adsorbing exogenous or endogenous toxins from the gastrointestinal tract of a patient can be prepared by a process including a step of treating activated carbon with an aqueous ammonia solution to provide a resultant activated carbon having a pH of 6 to 8.
Claims13
A method of treating activated carbon, which consists of essentially spherical activated carbon comprising at least 85% in number of microscopically spherical particles of activated carbon which have smooth and convex-curved surface without conspicuous edges and a ratio of the maximum diameter to the minimum diameter of 1.0 to 1.3, said essentially spherical particles of activated carbon being 0.05 to 2 mm in diameter, 500 to 2,000 m.sup.2 /g in surface area and 0.05 to 1.0 cc/g in volume of pore cavity determined in the range of pore-radius of 100 to 75,000 .ANG., to provide an antidotally effective pharmaceutical composition, which comprises contacting said activated carbon with an aqueous ammonia solution, having a NH.sub.3 concentration of 1 to 1,000 ppm, to provide the resultant activated carbon having a pH value of 6 to 8.
Dependencies are inferred from the claim text.