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Title: Measurement and Modeling of the Solubility of Vanillin Constituent of Olive Mill Wastewater in Binary Water + Ethanol Solvents Mixtures between 278.15 K and 308.15 K
Authors: Adel Noubigh; Mohamed Habib Oueslati
Aff: Department of Chemistry, Faculty of Science, P.O. Box 1231, Arar 91431, Kingdom of Saudi Arabia
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Keywords: Vanillin; Solubility; Mixed Solvent; Correlation; Thermodynamic Properties
Abstract:The aim of this study was to investigate the solubilities of vanillin (Van) in water + ethanol solvents mixtures from (278.15 to 308.15) K at atmospheric pressure using a thermostatted reactor and UV/vis spectrophotometer analysis. The effects of binary solvents composition and temperature on the solubility were discussed. The solubility data were correlated with the modified Apelblat equation and semi-empirical Buchowski-Ksiazczak .h equation. The calculated solubilities show good agreement with the experimental data in the temperature range studied. Using the experimentally measured solubilities, the thermodynamic properties of dissolution of the vanillin such as Gibbs energy (osolG.), molar enthalpy of dissolution (osolH. ), and molar entropy of dissolution (osolS. ) were calculated. Therefore, the experimental solubility and correlation equation in this work can be used as essential data and models in the purification process of vanillin.