Beads of acrylonitrile polymer of low crosslinking were first heated in the presence of oxygen and then pyrolyzed under nitrogen atmosphere in a cracking furnace. The spherical carbonaceous adsorbent thus obtained had a diameter of 0.4-0.6mm. The physical properties of the carbonaceous beads were measured. The surface area of the beads is near 600 m2/g and the distribution of pore diameters is 800-40

000 A. The adsorption of the creatinine

uric acid

or vitamin B12 is all over 98%

As the pyrolysis temperature for adsorbents was over 650℃

the spherical carbo-naceous adsorbents

whether activated or inactivated

had good adsorption for creati-nine and uric acid.