Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

The objective of this work was to measure and correlate the solubility of 4-hydroxy-2,5-dimethyl-3(2H)- furanone (DMHF) in six pure solvents, including methanol, ethanol, n-propyl alcohol, n-butyl alcohol, nhexane and distilled water, over the temperature range from 283.15 K to 313.15 K under atmospheric pressure of 0.10 MPa. Measurements were performed using the dynamic method coupled with a laser monitoring system as the observation technique. The solubility of DMHF in all the selected solvents was found to increase with rising temperature, and methanol has much more dissolving capacity for the DMHF solute. The experimental solubility of DMHF in pure solvents was well correlated with the modified Apelblat equation, van t Hoff equation and kh equation. The results of the error analysis indicated that the modified Apelblat equation was able to give more accurate and reliable predictions of solubility with the relative average deviation (RAD) and root-mean-square deviation (RMSD) values being observed in the range of 0.21 0.67% and 0.01 0.13%, respectively. The modified Apelblat equation was therefore used to estimate the changes of dissolution enthalpy (DdissH ), dissolution entropy (DdissS ) and molar Gibbs free energy (DG diss) of DMHF in the solvents investigated. The positive values of the DdissH , DdissS and DdissG revealed the dissolution process of DMHF in the selected solvents was endothermic and enthalpy-driven.