Equation of state for the NaCl---H 2 O---CO 2 system: prediction of phase equilibria and volumetric properties

Details Equation of state for the NaCl---H 2 O---CO 2 system: prediction of phase equilibria and volumetric properties Equation of state for the NaCl---H 2 O---CO 2 system: prediction of phase equilibria and volumetric properties

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.2869d&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 59, Issue 14, pp.2869-2882

Computer Science

27

Scientific paper

An equation of state (EOS) has been developed for the NaCl---H 2 O---CO 2 system which consistently predicts various properties including PVTX , immiscibility or phase equilibria, solubilities, and activities with an accuracy close to that of experimental data from 300 to about 1000°C and 0-6000 bar with NaCl concentrations to about 30 wt% of NaCl (relative to NaCl + H 2 O) or to about 50 wt% with less accuracy. The EOS predicts that excess volumes can be over 30% of the total volume under some T-P conditions. Adding NaCl to the H 2 O---CO 2 system dramatically increases the T-P range of immiscibility. The immiscibility field is minimal around 400-500°C. Above or below this temperature, it expands for a constant pressure. A moderately saline brine can evolve into a very saline brine by phase separation at high temperatures. The presence of NaCl can substantially decrease the activity of H 2 O and increase that of CO 2 , thus affecting decarbonation and dehydration reactions. Compared to the EOS of Bowers and Helgeson (1983a), the EOS of this study is more reliable in the calculation of volumetric properties particularly in the low pressure range. In addition, BH EOS cannot predict phase equilibria.

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