| 摘要 |
PURPOSE:To provide a peroral antidote containing an NH3-treated spherical activated carbon having specific particle diameter, surface area, pore volume and pH as an active component, free from side effect of constipation and exhibiting excellent antidotal effect. CONSTITUTION:An activated carbon of minute spherical form having a diameter of 0.05-2mm, a surface area of 500-2,000m<2>/g a pore volume of 0.05-1ml/g corresponding to pore radius of 100-75,000Angstrom and pH of 8-10 is produced e.g. by forming small spheres of pitch in molten state, oxidizing and infusibilizing the spherical pitch, carbonizing in an inert atmosphere at 800-1,000 deg.C and activating in steam atmosphere at 900-1,000 deg.C. The produced activated carbon is made to contact with an aqueous solution of NH3 and dried to obtain activated carbon having 6-8pH and the same shape as above. >=85% of the obtained activated carbon has true spherical form wherein the ratio of the maximum diameter and the minimum diameter is 1-1.3. A particular surface can be obtained by the NH3-treatment to acquire excellent adsorptivity compared with a conventional activated carbon. |
