Isobaric vapor-liquid equilibria in the systems methyl acetate+2,2′-oxybis[propane], 2,2′-oxybis[propane] plus toluene, and methanol+2-methyl-2-butanol

Vapor-liquid equilibrium at 94 kPa has been determined for the binary systems methyl acetate + 2,2 ' -oxybis [propane], 2,2 ' -oxybis[propane] + toluene, and methanol + 2-methyl-2-butbnol. The system methyl acetate + 2,2 ' -oxybis[propane] deviates positively from ideal behavior and presents a minimum boiling azeotrope at 327.29 K with 78 mol % methyl acetate. The system 2,2 ' -oxybis[propane] + toluene exhibits slight positive deviations from ideal behavior. The system methanol + 2-methyl-2-butanol shows negative deviations from ideal behavior, and this experimental result is explained in terms of the competitive self and cross-association of the constituent alcohols. The vapor-liquid equilibrium data of the measured systems were Compared to predictions of the UNIFAC group contribution method and correlated by the Wohl, NRTL, Wilson, and UNIQUAC models. The boiling points of all the binary systems were correlated with mole fractions by the Wisniak-Tamir and Wisniak-Segura equations.