Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

The solid-liquid equilibrium of benzoic acid has been determined in six mono-solvents tributyl phosphate, diacetone alcohol, methyl-n-propyl ketone, methyl acetate, amyl acetate and isooctane at temperatures from 283.15 to 328.15 K and five binary systems ethanol + hexane (283.15 to 328.15 K), isopropyl alcohol + hexane and chloroform + hexane (283.15 to 323.15 K), acetone + hexane (278.15 to 318.15 K) and acetone + water (283.15 to 318.15 K) at atmospheric pressure with varying mole fraction of the binary mixture. The solubility was estimated by three different methods titrimetry, gravimetry and high-pressure liquid chromatography methods. The solubility of benzoic acid was found to increase with an increase in temperature and mole fraction. Experimental solubility data was correlated with various thermodynamic models such as Buchowski equation, NRTL model, modified Apelblat-JouybanAcree model. The mathematical models demonstrated that the calculated and experimental solubilities of benzoic acid in the solvents were in good agreement.