Volumetric properties of the binary mixture of ethylene glycol + tert-butanol at T = (278.15, 288.15, 298.15, 308.15, 323.15, 333.15, 348.15) K under atmospheric pressure

Abstract

Densities of ethylene glycol(1)+tert-butanol(2) mixtures were measured between (278.15–348.15) K at atmospheric pressure over the entire composition range with a vibrating tube densimeter. It was found that specific volume of mixture increases with growth of tert-butanol concentration at all temperatures under study. Excess molar volumes, apparent and partial molar volumes of ethylene glycol and tert-butanol, coefficients of isobaric expansion of mixture and partial molar isobaric expansion of the components were calculated. Excess molar volumes of the mixture are negative at all temperatures, and deviation from ideality is increased with temperature rise. Excess molar volumes were described by Redlich–Kister equation. Partial molar volumes of ethylene glycol decrease sharply at x2→1. Temperature dependence of partial molar volumes of ethylene glycol is characterized by inversion at х2≈0.7. The “negative expansion” of limiting partial volumes of ethylene glycol was observed. Coefficients of isobaric expansion of the mixtures increased with rise both of tert-butanol concentration and temperature.