Isothermal (vapour + liquid) equilibria for (nitromethane or nitroethane + 1,4-dichlorobutane) binary systems at temperatures between (343.15 and 363.15) K

Isothermal (vapor + liquid) equilibrium data are reported for the binary mixtures containing (nitromethane or nitroethane + 1,4-dichlorobutane) at three temperatures, (343.15, 353.15, 363.15) K. The measurements were performed by means of an ebulliometer which allows sampling from both phases in equilibrium. The experimental data were correlated using the Redlich–Kister, Wilson, NRTL and UNIQUAC excess Gibbs energy models by means of maximum likelihood method, taking into account the vapour phase imperfection in terms of the second virial coefficients. Both systems are zeotropic and show positive deviations from ideal behaviour. The experimental VLE data are analysed in terms of the Modified UNIFAC (Do) model.

Isothermal (vapour + liquid) equilibrium data for (nitromethane (1) + 1,4-dichlorobutane (2)) system at 343.15 K (●, ○), 353.15 K (▴, △), and 363.15 K (■, □); solid points: liquid phase, open points: vapour phase; (––) 4th order Redlich-Kister correlation; (----) Modified UNIFAC (Do) prediction.Figure optionsDownload as PowerPoint slideHighlights
► Isothermal VLE data were reported for two binary systems at 3 temperatures.
► Correlation of VLE data was made with Redlich–Kister, Wilson, NRTL, UNIQUAC models.
► Thermodynamic consistency was check by Van Ness test proving very good VLE data.
► Modified UNIFAC (Do) model has to be improved for these types of VLE and GE systems.