| 摘要 |
PURPOSE:To obtain a hollow carbonaceous spherical body of light weight excel lent in heat resistance and chemical resistance by allowing a pitch powder having specified softening point and size to adsorb a specified amt. of iodine in an iodine vapor and then treating the powder by heating at specified temp. CONSTITUTION:A pitch powder having 150-300 deg.C softening point and 005-1mm particle diameter is prepared. Then the powder is treated to adsorb 80-250wt.% iodine as the weight increase in an iodine vapor at 80-130 deg.C, and then treated by heating at >=400 deg.C. By this method, first, the surface of pitch particles is hardened, and then the inner pitch which is not hardened is melted by heating. Then the powder is foamed by the gas component produced in the pitch to obtain a hollow carbonaceous spherical powder. The obtd. hollow carbonaceous spherical powder can be used as a light-weight filler or activated to be used as a hollow activated carbon. |
