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

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, beta, vs. the system pressure, P. The SCVMS data are accurate, because the VLE data converge to the same ln beta vs. lnP straight line determined from conventional distillation-still method and a headspace gas chromatography method. (C) 2014 Elsevier Ltd. All rights reserved.