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Abstract
A method recently proposed for estimating the second cross virial coefficient from complete vapour—liquid equilibrium data has been tested by Monte Carlo simulation. The precision of B 12 estimation, the bias due to the method, the effect of systemitic errors in xyPT data, and the effect of statistical weighting of the individual measured variables have been thoroughly assessed. In general, the applicability of the method depends on the shape of the P− x ( y− x) curve, the measurement precision and the distribution of experimental points. If reliable, precise and numerous VLE data are available, then in favourable cases defined by a criterion formulated for this purpose, the error in B 12 is estimated to be 50–100 cm 3 mol −1. The most obvious use of the method appears to be for systems with strong specific interactions between the components in the vapour phase.
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