PRE-CHROMATOGRAPHY CRUDE SEPARATION OF LIGHT FULLERENES BY POLY-TERMICAL (RE)CRYSTALLIZATION METHOD
Annotation
The pre-chromatography method of crude separation of light fullerenes (C60 and C70) is based on multistage processes of (re)crystallization — the solution of fullerenes solid solutions in liquid solvent (o-xylene) or in liquid o-xylene solutions at high temperature (85 ˚ C) and crystallization of solid solutions from saturated liquid solutions at low temperature (–20 ˚ C). As a result, for example, the initial standard fullerene extract may be efficiently divided into two different solid solutions — the first, considerably enriched in C60 fullerene and the second, considerably enriched by the C70 fullerene. In this separation process, the concentrate enriched by C60, is also enriched in C 84. In that process, 98.6 mass % of C60 was contained in the C60- enriched concentrate (from the sum content of C60 in the initial extract), simultaneously, 65.9 mass % of C70 contained in the C70-enriched concentrate (from the sum content of C70 in the initial extract).
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