METHOD OF SEPARATING FULLERENES Russian patent published in 1998 - IPC

FIELD: substance separation techniques. SUBSTANCE: method is developed for isolating fullerenes C₆₀, C₇₀, and higher from fullerene-containing carbon black using liquid-phase chromatography technique. Main component of eluent is nonpolar aromatic solvent (toluene and/or benzene); solid carrier is coke, anthracite, and/or artificial graphite. Separation is carried out at 30 to 80 C. Yield of 99-100% pure C₆₀ product is as high as 97%, and that of 94-98% pure C₇₀ up to 57%. EFFECT: improved separation efficiency. 1 tbl