METHOD OF PREPARING FULLEREN C60 Russian patent published in 2004 - IPC

FIELD: carbon materials. SUBSTANCE: 110.3 g of fulleren mixture containing 35 wt % C60 and 65 wt % C70 is stirred for 1.5 h in 1100 ml o-xylene at 80- 85 C. Mixture is filtered on hot vacuum filter at the same temperature. Precipitate is dried to constant weight under reduced pressure. Dissolution and filtration are carried out to achieve content of C60 96+/-2%. C60-enriched precipitate is dissolved in toluene and isolated therefrom using sorbent chromatography purification technique, sorbent being granulated nitrogen-containing activated carbon. Fine-crystal precipitate is washed with light petroleum and dried at 55-60 C to constant weight. Final industrial-purity product contains more than 99.5% C60. EFFECT: increased purity of product, simplified process, avoided use of inert gas, and enabled reuse of regenerated sorbent. 3 tbl, 4 ex