VLE measurements using a static cell vapor phase manual sampling method accompanied with an empirical data consistency test

•We use a new, simple static cell vapor phase manual sampling method (SCVMS) for VLE (x, y, T) measurement.•The method is applied to non-azeotropic, asymmetric and two-liquid phase forming azeotropic binaries.•The method is approved by a data consistency test, i.e., a plot of the polarity exclusion factor vs. pressure.•The consistency test reveals that with the new SCVMS method accurate VLE near ambient temperature can be measured.•Moreover, the consistency test approves that the effect of air in the SCVMS system is negligible.

A new static cell vapor phase manual sampling (SCVMS1) method is used for the simple measurement of constant temperature x, y (vapor + liquid) equilibria (VLE). The method was applied to the VLE measurements of the (methanol + water) binary at T/K = (283.2, 298.2, 308.2 and 322.9), asymmetric (acetone + 1-butanol) binary at T/K = (283.2, 295.2, 308.2 and 324.2) and two-liquid phase forming azeotropic (water + 1-butanol) binary at T/K = (283.2 and 298.2). The accuracy of the experimental data was approved by a data consistency test, that is, an empirical plot of the polarity exclusion factor, β, vs. the system pressure, P. The SCVMS data are accurate, because the VLE data converge to the same lnβ vs. lnP straight line determined from conventional distillation-still method and a headspace gas chromatography method.