Recovery of C.sub.60 and C.sub.70 buckminsterfullerenes from carbon soot by supercritical fluid extraction and their separation by adsorption chromatography
US5281406A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1992 |
| Grant date | Jan 25, 1994 |
| Priority date | — |
| Expiry date | Apr 22, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S977/845
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A process has been developed to effectively separate and recover essentially pure amounts of both C.sub.60 and C.sub.70 from carbon soot and higher molecular weight fullerenes. This process first extracts the fullerenes from carbon soot and then sequentially separates the C.sub.60 and C.sub.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.sub.60. Unrecovered C.sub.60 and C.sub.70 molecules are then extracted by supercritical fluid extraction at a higher pressure and/or higher temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.