Isothermal Vapor–Liquid Equilibria of Binary Mixtures Containing <i>N</i>,<i>N</i>-Dimethylacetamide with 1,3,5-Trimethylbenzene or Propan-2-ol or Dimethyl Sulfoxide

The vapor pressures of the binary mixtures {N,N-dimethylacetamide + 1,3,5-trimethylbenzene, + propan-2-ol, or + dimethyl sulfoxide (DMSO)} and their pure components were measured using a static apparatus in the temperature range of 273.15–363.15 K. Semiempirical correlations as described by the Antoine equation were used to correlate the obtained results. The excess Gibbs function GE was evaluated for several constant temperatures and fitted to the Redlich–Kister equation. Positive deviations in GE are shown by the binary systems {N,N-dimethylacetamide + 1,3,5-trimethylbenzene, or + DMSO} in all investigated temperatures over the whole composition range, where a negative deviation in GE in all temperatures studied over the whole composition range is observed for the (N,N-dimethylacetamide + propan-2-ol) binary system. Additionally, NRTL and UNIQUAC models were used for the correlation or prediction of the total pressure.