|United States Patent||5,281,406|
|Stalling, et. al.||Jan. 25, 1994|
|Inventors:||Stalling; David L. (Columbia, MO); Saim; Said (Columbia, MO); Guo; Congyuan (Columbia, MO); Kuo; Kenneth (Columbia, MO).|
|Assignee:||Analytical Bio-Chemistry Laboratories, Inc. (Columbia, MO).|
|Filed:||Apr. 22, 1992|
|Intl. Cl.:||C01B 31/00; C01B 31/02;|
|U.S. Cl.:||423/445.B; 423/461.;|
|Field of Search:||445 B;461 |
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A process has been developed to effectively separate and recover essentially pure amounts of both C(60) and C(70) from carbon soot and higher molecular weight fullerenes. This process first extracts the fullerenes from carbon soot and then sequentially separates the C(60) and C(70) molecules using high performance or low pressure adsorption chromatography packed column containing a gel polymer having aromaticity and a pore size ranging from 10 to 500 .ANG..
In this process, a first stage of fractionation of the fullerenes is preferably accomplished by selective supercritical fluid extraction (SFE) of C(60). Unrecovered C(60) and C(70) molecules are then extracted by supercritical fluid extraction at a higher pressure and/or higher temperature.