Isothermal vapor–liquid equilibria of mixtures of (methanol+ethanol+1-propanol or 2-propanol) at 333.15 K

The UNIQUAC associated-solution theory is extended to reproduce systems containing three alcohols and is applied to binary and ternary mixtures of alcohols. The isothermal vapor–liquid equilibrium data of the liquid mixtures of (methanol+ethanol+1-propanol) and (methanol+ethanol+2-propanol) have been measured at 333.15 K using a modified Boublik vapor-recirculating still. The experimental results are analyzed by use of the UNIQUAC associated-solution theory and the UNIQUAC model with binary parameters alone. Both models give comparable results.