Liquid-Liquid Equilibrium of Water+1-Butanol + Inorganic Salt Systems at 303.15, 313.15 and 323.15 K: Experiments and Correlation

Liquid-liquid equilibria (LLE) and tie-line data of systems containing 1-butanol, water and NaCl, Na2SO4, NH4Cl or (NH4)(2)SO4 were investigated at 303.15, 313.15 and 323.15 K and atmospheric pressure. The salt decreases mutual solubilities of these two solvents leading to a higher degree of phase separation at equilibrium. The effect is more pronounced at high salt concentration. Temperature in the studied range had a minor effect on LLE behavior of these mixtures. Experimental data were correlated using a modified extended UNIQUAC model. Satisfactory agreement between the calculated and measured mass fractions of the components was achieved.