Abstract
Development of ionic liquids for specific tasks is currently being pursued by many researchers as numerous cation/anion combinations are theoretically possible. However, only a small fraction of these combinations melt below 100 °C. Recently, large melting point depressions of several ionic solids with compressed carbon dioxide have been reported. This investigation details the melting point depression of a large number of ionic organic compounds (ionic liquids) with gaseous, liquid, and supercritical CO2. Large and previously unreported depressions were observed for some of the ionic solids. This methodology greatly expands the numbers of compounds and functional groups that can be employed in an ionic liquid/compressed gas system for various applications. Thermodynamic analysis indicates that even small amounts of CO2 can lead to substantial melting point depression, due to its very low melting temperature and negative deviations to Raoult's law.
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