LAUSR

Abstract The solid-liquid equilibrium data of dicumyl peroxide (DCP) in seven pure solvents and ethanol-water binary system and DMF-water binary system were measured from 274.15 K to 302.15 K by a gravimetric method under atmospheric pressure. The results show that the solid-liquid equilibrium solubility of DCP rapid increased with augmented temperature in different types of pure solvent while the solubility in binary solvent mixtures increases with the increasing of the fraction of ethanol and DMF. The measured data in pure solvents were correlated with several thermodynamic models including the modified Apelblat model, λh model and NRTL model. All the experimental results were agreement with the fitted values. Moreover, the NRTL model was adopted to calculate the enthalpy, entropy and Gibbs energy change during the dissolution process. And for the binary solvent system, the CNIBS/R-K model was used to correlate the solubility data. It was found that the correlated results by the NRTL model agreed best with the experimental data. Besides the results indicate that the mixing process of dicumyl peroxide in the experimental solvents was spontaneous and entropy-driven.