Abstract
A method is developed for testing the consistency of azeotropic data in the ternary system at constant pressure by use of a topological condition to be satisfied by the sums of indices of pure materials and azeotropes and also a thermodynamic condition to be satisfied by their boiling temperatures. Since the method requires only information on the existence of azeotropes and the boiling temperatures of pure materials and azeotropes, it can quickly test a large number of azeotropic data in the data base with use of a computer. 558 azeotropic data available in Horsley's data book are tested and 19 inconsistent data are detected by this method.
