화학공학소재연구정보센터
Journal of Physical Chemistry B, Vol.108, No.7, 2376-2382, 2004
Solubility of ionic liquid [emim][PF6] in alcohols
The solubility of 1-ethyl -3-methylimidazolium hexafluorophosphate, [emim][PF6], in alcohols (methanol, ethanol, propan-1-ol, propan-2-ol, butan-1-ol, butan-2-ol, tert-butyl alcohol, and 3-methylbutan-1-ol) has been measured by a dynamic method from 290 K to the melting point of ionic liquid or to the boiling point of the solvent. The solubility of [emim][PF6] in alcohols decreases with an increase of the molecular weight of the solvent and is higher in secondary alcohols than in primary alcohols. In every case, with the exception of methanol, the mutual liquid-liquid equilibrium was observed. The shape of the equilibrium curve is similar for [emim][PF6] in every alcohol. The observation of the upper critical solution temperature was limited by the boiling temperature of the solvent. The liquidus curves were correlated by means of two modified nonrandom two-liquid and the UNIQUAC ASM equations utilizing parameters derived from the solid-liquid equilibrium.