Abstract
In this work, salt effect on the liquid phase equilibrium of (water+diethanolamine+isobutanol) and (water+diethanolamine+cyclohexanol) systems was investigated at T=(298.2 and 308.2) K. The liquid-liquid equilibrium data in the presence of KCl and NaCl salts for various ionic strength of 0.5, 1.0, 1.5, and 2.0mol·dm−3 and in absence of these salts were determined. The experimental results were correlated based on the Othmer-Tobias equation, Bachman equation and Pitzer ion-interaction model. Thermodynamic properties such as distribution coefficients and activity coefficients of diethanolamine in water+isobutanol and water+cyclohexanol mixtures were determined. In addition, the separation factor of the chosen solvents were obtained for the investigated systems.
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