Experimental investigation of the thermal properties of a binaryn-hexane-water mixture at high temperatures and pressures

The results are presented of an experimental investigation of the thermal properties of a binaryn-C6H14 + H2O mixture (system) in the ranges of temperature from 372.75 to 690.55 K, density from 66.87 to 834.30 kg/m, and pressure from 0.4 to 65.7 MPa. Measurements are performed for seven values of water concentrationx (in molar fractions), namely, 0.166, 0.257,0.347,0.615,0.827,0.935, and 0.964. The investigations cover the region of liquid-vapor phase equilibrium and extend further into the homogeneous region. In order to describe theP-V-T-x properties of a binary n-hexane-water mixture, the Soave-Redlich-Kwong formula is used (the average error is 3%, and the maximum error is 8%). Based on the scaling equations, the critical indices and amplitudes for the curves of liquid-vapor coexistence are calculated for three values of water concentration.