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Journal Article
Research Support, Non-U.S. Gov't
Insight into the phase equilibrium phenomena of systems containing dienes and dicyanamide ionic liquids as a new potential application.
Journal of Physical Chemistry. B 2010 December 3
This work presents a systematic investigation into liquid-liquid phase equilibria for systems containing three various ionic liquids and four dienes as they have not been reported yet. The systems employed in this study containing dicyanamide based ionic liquids and dienes reveal the phase envelopes that have a similar shape to binodal curves with the upper critical solution temperature. Generally, 1-methyl-3-octylimidazolium dicyanamide ([C(8)mim][DCA]) was found to be a better solvent for nonpolar dienes. The 1-butyl-3-methylimidazolium dicyanamide ([C(4)mim][DCA]) ionic liquid is a much worse solvent for 1,5-cyclooctadiene, 1,3-cyclooctadiene, 1,5-hexadiene, and 1,7-octadiene compared to other ionic liquids studied. The miscibility gaps shrink for a less polar [C(8)mim][DCA] or even more for 1-dodecyl-3-methylimidazolium dicyanamide ([C(12)mim][DCA]). In the range of the studied temperatures, the solubility of dienes is significantly higher compared to the solubility of the ionic liquids containing the shorter alkyl chain in the cation. The solubility of the presented dienes in ([C(4)mim][DCA]) ionic liquid is also relatively high and may reach up to 0.19 mol fraction of the diene. The attained results demonstrate that nonpolar compounds can be dissolved to some extent in highly charged and polar solvents such as ionic liquids.
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