The effect of temperature on the liquid–liquid equilibria of some aliphatic alcohols + di-sodium hydrogen citrate + water systems: Experimental and correlation

• LLE of alcohol + di-sodium hydrogen citrate + H2O was studied.
• The effect of temperature on the binodals and tie-lines was investigated.
• Binodal data were correlated with temperature dependent Merchuk equation.
• Tie-lines were fitted to several models including extended NRTL and Wilson.
• Best result is obtained with the generalized NRTL model.

Liquid–liquid equilibrium data for the ternary systems (1-propanol, 2-propanol, 2-methyl-2-propanol, 1-butanol and 2-butanol + di-sodium hydrogen citrate + water) were measured at T = 298.15, 308.15 and 318.15 K. The phase-separation ability of the studied systems was discussed on the basis of the solubility of the constitutive alcohol. Furthermore, the effect of temperature on the tie-line at investigated systems was discussed. The Merchuk equation with three parameters as the temperature dependency form was successfully used for the correlation of binodal data in working temperatures. In addition, the experimental tie-line data were reproduced using the Setschenow-type equation, the generalized e-NRTL and generalized Wilson models.