Isobaric vapor–liquid equilibrium (VLE) data for the binary system acetamide + N,N-dimethyl formamide (DMF) and the quaternary system sec-butyl alcohol (SBA) + sec-butyl acetate (SBAC) + acetamide + DMF were measured at 101.3 kPa. The VLE data were verified to be thermodynamically consistent by the Fredenslund test and Wisniak’s L–W test. In addition, the binary interaction parameters of UNIQUAC, Wilson, and NRTL models for DMF–acetamide were obtained by correlating the binary VLE data. UNIQUAC, Wilson, NRTL, and COSMO-UNIFAC models were employed to predict the VLE data, and the results were compared with the experimental results. Compared with the result without entrainers, the effect of mixed solvent acetamide + DMF (the mass ratio of acetamide to DMF is 1:1) can enhance the relative volatility of SBAC to SBA obviously.

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