[Back to the Fullerene Patent Database]

United States Patent 5,281,406
Stalling, et. al.Jan. 25, 1994

Recovery of C.sub.60 and C.sub.70 buckminsterfullerenes from carbon soot by supercritical fluid extraction and their separation by adsorption chromatography

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).
Appl. No.: 874,473
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

References Cited

U.S. Patent Documents
4,983,528Jan., 1991Loucks 210/656

Other References

Primary Examiner: Lewis; Michael
Assistant Examiner: Kalinchak; Stephen G.

Abstract

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.

23 Claims, 17 Drawing Figures


[Back to the Fullerene Patent Database]