Abstract
The performed analysis of the van Laar equation and its comparison with the results of analyses of the Redlich-Kister, NRTL and Wilson equations demonstrate that the Redlich-Kister equation have approximately the same range of applicability, the NRTL equation with a suitable choice of the parameter α allowing to attain higher limiting activity coefficients. For moderately asymmetric systems, the Wilson equation provides higher activity coefficients than other two-parameter equations but lower than the three-parameter ones. On the contrary, for very asymmetric systems, the Wilson equation allows to reach on the whole the highest limiting activity coefficients.
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