Isobaric Vapor–Liquid Equilibrium Measurements for 1-Methoxy-2-propanol + 1,4-Butanediol, N,N-Dimethylformamide, and N-Methyl-2-pyrrolidone at 101.3 kPa

Abstract

Three candidate entrainers, 1,4-butanediol, N,N-dimethylformamide, and N-methyl-2-pyrrolidone, were proposed to separate the azeotrope of 1-methoxy-2-propanol and water. The isobaric vapor–liquid equilibrium data for 1-methoxy-2-propanol + 1,4-butanediol, 1-methoxy-2-propanol + N,N-dimethylformamide, and 1-methoxy-2-propanol + N-methyl-2-pyrrolidone were measured at 101.3 kPa. All of the data passed the Fredenslund, Van Ness, and pure component consistency tests. The binary parameters were regressed by the non-random two-liquid, Wilson, and universal quasichemical models, and these models agree well with the experimental data. The average absolute deviation and root-mean-square deviations of the temperatures and vapor compositions are all less than 0.2 K and 0.005, respectively. The performance of candidate entrainers was compared based on the relative volatility.