Solubility determination and correlation of pentaerythritol in binary solvent
The solubility of pentaerythritol in different proportions of isopropanol-water and tert-butanol-water mixed solvents at 323.15～353.15 K was determined by synthetic method.The experimental data were correlated by modified Apelblat equation,Jouyban-Acree model and Van't Hoff-Jouyban-Acree model.The maximum absolute deviation(D)was less than 0.004 33,and the average relative deviation(ARD)was less than 3.21％.The calculated values of the model were in good agreement with the experi-mental values.According to the Van't Hoff equation,the dissolution enthalpy,dissolution entropy,Gibbs free energy change,enthalpy contribution value and entropy contribution value of the pentaerythritol disso-lution process were calculated.The results show that pentaerythritol shows the same dissolution law in the two mixed solvents.The solubility increases with the increase of temperature.At the same temperature,its solubility decreases with the increase of alcohol solvent content in the solvent.The dissolution enthalpy is greater than zero,and the increase of temperature is beneficial to the dissolution of pentaerythritol.The en-thalpy contribution in the solvent is greater than 50％,and the Gibbs free energy is mainly affected by the dissolution enthalpy change.The KAT-LSER model was used to analyze the solvent effect of pentaerythri-tol in mixed solvents.The solubility of pentaerythritol was mainly affected by the hydrogen bond between solute and solvent.
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