Computer Science
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53..973t&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 53, Issue 5, pp.973-987
Computer Science
11
Scientific paper
A new equation of state for NaCl-H 2 O is based on an expansion around the critical point of pure H 2 O. Only a few simple terms relate to the NaCl content, but the complete equation of et al . (1984) is used for H 2 O. Three temperature-dependent parameters are adjusted to fit the entire vapor-liquid coexistence surface from 250 to 600°C. One further temperature-dependent function relates the chemical potential of NaCl to that of the solid. Appropriate derivatives of the parent function for the Helmholtz energy then yield the density and the full array of thermodynamic properties. While full agreement with all experimental data within their uncertainties is not attained, the agreement is good throughout the range 300 to 600°C, vapor + liquid saturation pressure to one kbar and from the vapor composition at the three-phase line to that of the corresponding liquid. Comparisons with published equations valid for liquid-only or vapor-only conditions also show satisfactory agreement.
Pitzer Kenneth S.
Tanger John C. IV
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