The vapor−liquid equilibrium (VLE) isotherms were directly determined by the ebulliometric method for the system 2-ethoxyethanol + methanol. The experimental results were correlated by an equation of state that is capable of reproducing VLE for associating and reacting systems with an accuracy similar to the experiment uncertainty over a reasonable range of pressure and temperature. Such correlations are hard to obtain with equations representing activity coefficients at specific particular isotherms.

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The vapor pressure of pure tert-amyl methyl ether (TAME) was measured together with isothermal P-x data for mixtures of pentane + TAME and pentane + tert-amyl alcohol (TAOH) at temperatures between 70 and 110 °C. Also, activity coefficients at infinite dilution for the binary mixtures of TAME + TAOH were obtained in the 90-120 °C temperature range. The P-T-x data were correlated using the Peng-Robinson equation of state separately with the van der Waals and Wong-Sandler mixing rules.

The saturation pressures of acetonitrile (302 to 353) K, propanenitrile (309 to 353) K, 1-pentanamine (322 to 378) K, and 1-methoxy-2-propanol (331 to 373) K were measured by an ebulliometric method. The vapor−liquid equilibrium (p, T, x, y) was measured by an ebulliometric method for the systems acetonitrile + propanenitrile at (313.15, 323.15, and 343.15) K and 1-pentanamine + 1-methoxy-2-propanol at (333.15, 343.15, and 353.15) K. The experimental vapor pressures were correlated with the Antoine equation and, for pentanamine + 1-methoxy-2-propanol, also with the AEOS equation of state. The VLE data were correlated with the “γ/φ” method. For the system 1-pentanamine + 1-methoxy-2-propanol the prediction with the AEOS model has been proposed. In this system an almost tangent negative azeotrope is observed for temperatures below 350 K.