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This work presents the high-pressure phase behavior of CO 2 with six ionic liquids: 1-n-butyl-3-methylimidazolium hexafluorophosphate ([bmim] ]). We explored the effect of systematically changing the anionic and cationic components of the ionic liquid on the CO 2 -ionic liquid phase behavior. For all of the ionic liquids tested, large quantities of CO 2 dissolved in the ionic liquid phase, but no appreciable amount of ionic liquid solubilized in the CO 2 phase. In addition, the liquid phase volume expansion with the introduction of even large amounts of CO 2 is negligible, in dramatic contrast to the large volume expansion observed for neutral organic liquids. Our results seek to elucidate the underlying physical mechanisms of this highly unusual phase behavior.

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Simply applying CO 2 pressure on a liquid phase, reversible, equilibrium-limited reaction can enhance its equilibrium conversion. In particular, we show that the equilibrium conversion of the esterification of acetic acid with ethanol can be shifted from 63% in neat solution to 72% in CO 2 at 333 K and 58.6 bar.

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