Liquid–liquid equilibria of ternary mixtures of water + 2-propanol with ethyl acetate, isopropyl acetate, or ethyl caproate

Liquid–liquid equilibrium (LLE) data were measured for the ternary mixtures of water+2-propanol+ethyl acetate, water+2-propanol+isopropyl acetate, and water+2-propanol+ethyl caproate at atmospheric pressure over a temperature range of 283.15–323.15 K. All these three ternary systems exhibit the type-1 behavior of LLE. The areas of two-phase region decrease with increasing temperature for each ternary system and decrease in the order of the mixtures containing ethyl caproate>isopropyl acetate>ethyl acetate. Ethyl caproate is a preferable entrainer for separation of 2-propanol from aqueous solutions. The UNIQUAC model with the model parameters determined from the constituent binaries qualitatively predicted the binodal locus. By adjusting six parameters simultaneously, the NRTL and the UNIQUAC models correlated well the LLE data.