Add time:07/24/2019         Source:sciencedirect.com

The equilibrium solubility of four novel Brønsted-acidic ionic liquids (8-hydroxyquinoline phosphate ([HOQu][H2PO4]), 8-hydroxyquinoline sulfate ([HOQu][HSO4]), 8-hydroxyquinoline methanesulfonate ([HOQu][CH3SO3]) and 8-hydroxyquinoline p-toluenesulfonate ([HOQu][p-TSA])) in six lower alcohols (methanol, ethanol, 1-propanol, 2-propanol, 1-butanol and 2-methyl-1-propanol) was measured at temperatures from (278.15 to 348.15) K using a static method. With increasing temperatures, the solubility of ionic liquids increased and some of them showed “temperature-sensitive” property. The solubility of ionic liquids is closely related to the polarity and molecular structure of the solvents together with the strength of hydrogen bonding between anionic group of ionic liquids and alcohols. The experimental solubility values were well correlated by the modified Apelblat equation and λh equation. The dissolution enthalpy (ΔdisolnS) and dissolution entropy (ΔdisolnH) were determined using the van't Hoff equation and the change of Gibbs free energy (ΔdisolnG) was calculated at T = 298.15 K. The results showed that the dissolution process was endothermic and entropy-driven.

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