Thermodynamic properties of aqueous non-electrolyte mixtures II. Vapour pressures and excess Gibbs energies for water + ethanol at 303.15 to 363.15 K determined by an accurate static method

摘要: Abstract A new apparatus is described in which the vapour pressure of a liquid mixture determined accurately by static method. The has been designed to work temperature range 298.15 423.15 K for pressures up 1.5 MPa. Temperatures are measured within ±1 mK and ±0.02 per cent or ±2.6 Pa whichever greater, over 2.7 270 kPa. Vapour “;(1−x) H 2 O +x C 5 OH ’; have method at 303.15, 323.15, 343.15, 363.15 24 mixtures with x 0.0044 0.9815. Values molar excess Gibbs energy GE partial energies G1E computed Barker's Positive deviations from ideality were found all four temperatures maxima 770, 837, 889, 925 J mol−1 343.15 respectively; these occur values about 0.440, 0.428, 0.418, 0.406 respectively. combined experimental enthalpies HE give entropies SE. curves TSE against form smooth skewed parabolas large negative minima. minimum −1289, −1076, −858, −648 K. These minima value 0.28: presented. Isobaric liquid-vapour equilibrium data 101.325 kPa calculated isothermal data. results compared literature. composition normal-boiling positive azeotrope, = (0.8933±0.0005) T (351.320±0.002) K, was an analysis pressures. azeotrope formation (305.7±0.5) Azeotrope compositions 0.9324, 0.9002, (0.8845±0.0005)