Vapor−liquid equilibrium (VLE), excess molar enthalpies (H E ), and excess molar volumes (V E ) provide means of developing accurate thermodynamic models. In this work, new data of binary mixtures of ethyl acetate, butyl acetate, and 2-butanol are reported. Isothermal VLE data at 350 K were measured by using a circulation still for ethyl acetate + 2-butanol, for 2-butanol + butyl acetate, and for ethyl acetate + butyl acetate. H E was measured at 298 K by using a SETARAM C80 calorimeter equipped with a flow mixing cell. V E was measured at 298 K by using an Anton Paar DMA 512P densimeter. Liquid phase activity coefficients of the Wilson model and vapor phase fugacities of the Hayden−O'Connell correlation were regressed for a thermodynamic model based on the measured data. Model extrapolation agreed well with literature data. Redlich−Kister equation parameters were regressed by using only the measured V E data.

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Phase equilibrium and calorimetric measurements provide complementary data that are vital for process models. The combined use of vapor−liquid equilibrium (VLE) data and excess enthalpies (H E ) makes the thermodynamic model more reliable in extrapolation outside the conditions of the measurement. This is important during the tight time schedule of process development. In this work, phase equilibrium and excess enthalpies of binary mixtures were measured by using three apparatuses. Two types of VLE runs were conducted by using a circulation still of the Yerazunis-type and by using Agilent headspace sampler with a gas chromatograph (HS-GC). A SETARAM C80 calorimeter equipped with a flow mixing cells was taken into use for excess enthalpy measurements. New data of phase equilibrium, excess molar enthalpy, and excess molar volume were obtained for industrially relevant binary mixtures of methyl isobutyl ketone (MIBK) with alcohols (2-butanol, tert-pentanol, 2-ethyl-1hexanol). Excess enthalpy data at 298.15 K are well in line with equilibrium data obtained in the range of (294 to 368) K. Azeotropic behavior was observed in the MIBK + tert-pentanol system. The experimental data were used for the optimization of Wilson and Redlich−Kister equation parameters.

Pure component vapor pressure between (324 and 374) K, isothermal vapor−liquid equilibria at 358 K, excess enthalpy, excess volume, and density at 298 K were determined for three binary systems consisting of 2-ethoxy-2-methylbutane + 1-butanol, + 2-butanol, or + 2-methyl-2-butanol. Excess enthalpy was measured with a microflow calorimeter and excess volume with a vibrating-tube densimeter. A recirculation still was used to measure both the pure component vapor pressures and the phase equilibria of binary systems. The measured data were well-represented with local composition models. A maximum pressure azeotrope was observed for all measured systems.