Abstract
The system NaCl-H2O near the critical point of pure water shows not only the remarkable properties of any two-component system near the critical point of one component but also an anomalous curvature of the T-x and P-x projections of the critical line in the range below mole fraction 0.0005. An equation of state is presented which is based on the Haar-Gallagher-Kell equation for pure water with a few terms involving the mole fraction of NaCl together with the temperature and density. Parameters in this equation were selected which yield a good representation of the entire vapor-liquid coexistence surface from 250 to 600°C and from the three-phase pressure to the critical pressure (or to the vapor pressure of pure water below its T c). Derivatives of this equation yield densities, enthalpies, and heat capacities which are compared with experimental data. Also, the properties calculated for the vapor near the three-phase line are compared with those predicted by the successive hydration model previously developed for NaCl in steam in equilibrium with solid NaCl. Other related topics are discussed, including the anomalous features noted above.
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Pitzer, K.S., Tanger, J.C. Near-critical NaCl-H2O: An equation of state and discussion of anomalous properties. Int J Thermophys 9, 635–648 (1988). https://doi.org/10.1007/BF00503232
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DOI: https://doi.org/10.1007/BF00503232