Abstract
Carbon dioxide cylinders, pressurized with a helium headspace, find routine use as a solvent in analytical supercritical fluid extraction (SEE). In this study, the solubilities of soybean oil in neat supercritical carbon dioxide (SC-CO 2 ) and CO 2 with entrained helium were measured at 70 °C and three different pressures. The oil solubility was found to be substantially diminished when the CO 2 /He source was used, presumably by the presence of small amounts of helium dissolved in the extraction fluid. The recorded reductions in solubility (30-50 wt %) should be taken into account in performing and optimizing SEE with helium-pressurized cylinders.
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