The binary liquid-liquid equilibrium (LLE) data for the system dibutyl ether (DBE) + water from (288.15 to 318.15) K and the ternary LLE data for systems of DBE + C 1 ∼ C 4 alcohols (methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, and 2-butanol) + water at 298.15 K were analytically determined at atmospheric pressure using stirred and thermoregulated cells. The experimental binary and ternary LLE data were correlated with the NRTL and UNIQUAC activity coefficient models. In addition, the distribution and selectivity of C 1 ∼ C 4 alcohols as solvents were analyzed.

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Isothermal vapor-liquid equilibrium (VLE) data at 303.15 K are reported for the binary systems of di-isopropyl ether (DIPE) + 1-propanol, DIPE + 2,2,4-trimethylpentane, and 1-propanol + 2,2,4-trimethylpentane and also for the ternary system of DIPE + 1-propanol + 2,2,4-trimethylpentane by using headspace gas chromatography. Additionally, the excess molar volumes (V E ) at 303.15 K for the same systems were also determined by measured densities. The experimental binary and ternary VLE data were correlated with G E model equations and the V E were correlated with the Redlich-Kister equation for binary systems and the Cibulka equation for ternary system, respectively.

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