Supercritical Fluid Extraction of Fullerenes C60and C70from Carbon Soot
| Autor: | D. L. Stalling, S. Saim, Kenneth C. Kuo |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
Supercritical water oxidation
Fullerene Process Chemistry and Technology General Chemical Engineering Supercritical fluid extraction Filtration and Separation General Chemistry medicine.disease_cause Soot Supercritical fluid chemistry.chemical_compound chemistry Chemical engineering medicine Supercritical fluid chromatography Organic chemistry Solubility Cyclopentane |
| Zdroj: | Separation Science and Technology. 28:1509-1525 |
| ISSN: | 1520-5754 0149-6395 |
| Popis: | A new branch of organic chemistry has begun to emerge following the development of a carbon-arc electric discharge process by Kratschmer et al. which produced a carbon soot containing a series of caged buckminsterfullerene C60, C70, and higher homologues. While these compounds are normally recovered either by sublimation in an inert atmosphere or by extraction with benzene, toluene, or a higher boiling aromatic, enhanced selectivity can be achieved by operating at supercritical conditions. The ability of supercritical fluid solvents to fractionate the extractable material of the carbon soot by pressure and/or temperature tuning of the solvent power appears to be possible due to the significant molecular weight and size difference between C60 and C70 which yield different threshold solubility densities. While CO2 is unable to extract any fullerenes, selective extraction of C60 is obtained when using a nonaromatic modifier such as cyclopentane. Quantitative recoveries are achieved by employing mode... |
| Databáze: | OpenAIRE |
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