Measurements and correlation of the (solid plus liquid) equilibria of [1-decyl-3-methylimidazolium chloride plus Alcohols (C2-C12)]

This work presents the solid + liquid equilibria in binary systems consisting of 1-decyl-3-methylimidazolium chloride, [C(10)mim] [Cl], and alcohols [ethanol, 1-butanol, 1-hexanol, 1-octanol, 1-decanol, 1-dodecanol, 2-butanol, 2-methyl-2-propanol (tent-butyl alcohol)]. The measurements were carried out by using a dynamic method from 270 K to the melting point of the ionic liquid, 1-decyl-3-methylimidazolium chloride. The solubility of 1-decyl-3-methylimidazolium chloride, [C(10)mim] [Cl], in primary alcohols decreases with increasing of the length of the alcohol's alkyl chain. The difference between the primary, secondary, and tertiary alcohol is not significant. The differential scanning calorimetry (DSC) was used to determine the melting point, the enthalpy of fusion, and the enthalpy of the solid + solid phase transition of [C(10)mim] [Cl]. Therefore, the solid-liquid equilibria were correlated by means of the Wilson, UNIQUAC ASM, and NRTL 1 equations. Hence, the root-mean-square deviations of the solubility temperatures were from 0.70 to 4.77 K and depended on the particular equation used.