Abstract
The solubility of ethyl p-aminobenzoate (EPAB) was measured in six different alcohols (methanol, ethanol, n-propanol, n-butanol, isobutyl alcohol, isoamyl alcohol) within (283.15 to 327.15) K by the last solid disappearance method. The solubility increases with increasing temperature. The decreasing order satisfies the following sequence: methanol > ethanol > n-propanol > n-butanol > isoamyl alcohol > isobutyl alcohol. Four models, including modified Apelblat equation, λh model, NRTL model, and Wilson model, were used to correlate the experimental data of EPAB. It is found that the modified Apelblat equation, NRTL model, and Wilson model were suitable to correlate the solubility of EPAB in the selected solvents with an overall RAD less than 2%. In addition, the changes of thermodynamic properties of solution [standard molar enthalpy (ΔdisHo), standard molar entropy (ΔdisSo), and standard molar Gibbs energy (ΔdisGo)] were obtained. The results indicate that the dissolution process of EPAB in these alcohols...
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