SOLUTION MOLAR ENTHALPIES FOR 1-BUTYL-3-METHYLIMIDAZOLIUM CHLORIDE+1-PROPANOL SYSTEM AT 303.56 AND 318.68 K

Enthalpies of solution for 1-butyl-3-methylimidazolium chloride ([bmim]C1) + 1-propanol system have been measured in a SETARAM C80 3D calorimeter with reversal mixing mechanism over the composition range from m = 0.0048 to 2.6224 mol kg(-1) of [brnim]C1 at temperatures of 303.56 K and 318.68 K and atmospheric pressure. The data have been correlated adequately with Archer and Rard (1998) model for electrolyte systems. The mean relative deviations in absolute value obtained in molar enthalpy of solution correlation were situated between 5.9 % and 11.2 %. The molar enthalpies of solution at infinite dilution, the apparent relative molar enthalpies for the solutes and relative molar enthalpies L for the mixtures were determined according to this model. The latter thermodynamic property is endothermic throughout the whole composition range of studied homogenous mixtures, and at constant mole fraction decreases with increasing temperature. The negative solution molar enthalpy at infinite dilution confirmed that within low concentration range of the IL, the interactions which appear at mixing of the two compounds are strongly attractive and they are most likely dominated by the packing of unlike molecules.