Effect of high pressure and temperature on volumetric properties of {water (1)Â +Â ethylenediamine (2)} mixtures

For {water (1) + ethylenediamine (2)} binary mixture the densities at atmospheric pressure and compressions, k = ΔV / Vo, at pressures from 10 to 100 MPa of have been measured over the whole concentration range and temperatures from 278.15 to 323.15 K. The molar isothermal compressions and molar isobaric expansions, the thermal pressure coefficients and the internal pressure of water + ethylenediamine mixture have been calculated at all state parameters examined. It was shown that the values of molar isothermal compression and molar isobaric expansion of the mixtures rich in water varied insignificantly whereas the thermal pressure coefficients changed strongly within that concentration range. The magnitude of the extreme on the concentration dependence of the thermal pressure coefficient was unusually large that was probably connected with the influence of 2H2O-EDA hydrate complex.