Isobaric Vapor-Liquid Equilibrium Data at 101.3 kPa for the Binary System Acetamide plus N,N-Dimethyl Formamide and the Quaternary System sec-Butyl Alcohol plus sec-Butyl Acetate plus Acetamide plus N,N-Dimethyl Formamide

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.