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One-phase PVTx, phase transition ( p s ,  ρ s ,  T s ) and critical ( p c ,  ρ c ,  T c ) properties of the ternary equmolar system (0.333 mole fraction of each component) water+1-propanol+n-hexane were experimentally studied in the critical and supercritical regions. Measurements of the PVTx relationship were made using a high-temperature, high-pressure, constant-volume piezometer immersed in high precision air thermostat. The values of the phase transition parameters were determined using isochoric  P - T  break point technique. The standard uncertainty of the density, temperature, pressure, and concentration measurements was estimated to be 0.15%, 0.015 K, 0.05%, and 0.01 mole %, respectively. The measured PVTx data for the ternary mixture water+1-propanol+n-hexane were used to develop wide-ranged multiparametric equation of state.

Phase transitions and volumetric properties of the ternary system water+1-propanol+n-hexane near the critical point