LAUSR

Abstract The liquid-liquid equilibrium (LLE) properties were measured for the ternary systems of water + acrylic acid + ethyl acrylate, water + ethanol + ethyl acrylate, water + acrylic acid + n-butyl acrylate, and water + n-butanol + n-butyl acrylate at temperatures ranging from 283.15 K to 318.15 K under 101.3 kPa. The ternary system of water + n-butanol + n-butyl acrylate behaves as type-II LLE and the other three systems are categorized as type-I LLE. The new LLE tie-lines data were correlated with the NRTL and UNIQUAC models. The UNIQUAC model yields slightly better results than the NRTL model, except for the system of water + acrylic acid + ethyl acrylate. Satisfactory results can also obtained from the UNIQUAC model by using the parameters determined from the constituent binary phase equilibrium data for the type-II system (water + n-butanol + n-butyl acrylate), but substantial deviations were found as the UNIQUAC model using the parameters estimated from the group-contribution based UNIFAC model.