Salt effect on the liquid-liquid equilibrium of (water+diethanolamine+isobutanol/cyclohexanol) systems at T=(298.2 and 308.2) K

• Published in: Journal of molecular liquids 2016-10, Vol.222, p.558-563
• Main Authors: Ghalami-Choobar, Bahram, Fazli, Mostafa, HasannezhadSabersalimi, Fateme
• Format: Article
• Language: English
• Subjects: Activity coefficient; Diethanolamine; Distribution coefficient; Liquid-liquid equilibrium; Salt effect
• ISSN: 0167-7322; 1873-3166
• DOI: 10.1016/j.molliq.2016.07.084

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. •Salt effect on liquid phase equilibrium of (water+DEA+solvent) system was studied.•The liquid-liquid equilibrium in the presence of KCl and NaCl salts was determined.•Othmer-Tobias, Bachman and Pitzer equation were used to results correlation.•Distribution and activity coefficients of DEA in water+solvents were determined.•The separation factor of the chosen solvents was obtained for the studied systems.