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Isothermal Px data at60 C and heat-of-mlxlng data at 50 C are reported for the binary system water/ethylene glycol. These data, together with Px data at 50 C and HE dataat 25 C from the literature, are reduced to provide correlations for HE, GE, and SE as functions of both composition and temperature.

The heat-of-mixing measurements reported here for water/ethylene glycol at 50 C combine with the comprehen-sive data set at 25 C ofTouhara and Nakanishi (1) toestablish the temperature dependence of HE. The vapor/llquld equilibrium measurements reported for 60 C augment a comparable set of Px data at 50 C published earlier (2), and together they form the basis for correlation of GE. The ethylene glycol was 99+ mol% reagent from MCB Manufacturing Chemists, Inc. The water was doubly deionized. For Px measurements In the static VLE apparatus of Gibbs and Van Ness (3) both reagents were thoroughly …