Thermodynamic properties of disodium sebacate in different binary solvent mixtures

The solubility data of disodium sebacate in three kinds of water + organic solvent mixtures, including (water + methanol), (water + acetone) and (water + DMF), were experimentally determined at temperatures from (283.15 to 328.15) K by a gravimetric method. The results show that the solubility of disodium sebacate increases with increase of temperature in binary solvent mixtures at constant solvent composition, whereas it decreases with the increase of the mole fraction of organic solvent. The modified Apelblat equation, the λh model and the NRTL model were applied to correlate the solubility data in binary solvent mixtures. In addition, the dissolution thermodynamic properties of disodium sebacate in different binary solvent mixtures, including the Gibbs energy change, entropy and enthalpy, were also calculated and discussed based on the NRTL model and experimental solubility data.