Measurement and correlation of the solubility of caffeic acid in eight mono and water plus ethanol mixed solvents at temperatures from (293.15 to 333.15) K

The solubility of caffeic acid in mono solvents including methanol, ethanol, 1-propanol, 2-propanol, n-butanol, isobutanol, acetone, ethyl acetate and binary mixtures (water + methanol) were experimentally measured from T = (283.15 to 333.15) K by the gravimetric method. The experimental results show that values obtained increased with temperature increasing from (283.15 to 333.15) K. Good agreement was found between the experiments and calculations by the modified Apelblat equation, van't Hoff equation, lambda h equation. Furthermore, thermodynamic properties of dissolution of the caffeic acid in the selected solvents were estimated. Consequently, the experimental data and model parameters would be useful for optimizing the process of purification of caffeic acid in industry. (C) 2016 Elsevier B.V. All rights reserved.