Equation of state for the NaCl-H2O-CO2 system; prediction of phase equilibria and volumetric properties

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doi: 10.1016/0016-7037(95)00182-4
Authors:Duan, Zhenhao; Moller, Nancy; Weare, John W.
Author Affiliations:Primary:
University of California at San Diego, Department of Chemistry, La Jolla, CA, United States
Volume Title:Geochimica et Cosmochimica Acta
Source:Geochimica et Cosmochimica Acta, 59(14), p.2869-2882. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037
Publication Date:1995
Note:In English. 42 refs.; illus., incl. 8 tables
Summary:This equation of state is developed for predicting properties including P-V-T-X, immiscibility or phase equilibria, solubilities and activities from 300 to ∼ 1000°C and 0-6000 bar with ∼ 30 wt.% NaCl (relative to NaCl + H2O) or to ∼ 50 wt.% NaCl with less accuracy. Adding NaCl to H2O-CO2 greatly increases the T-P range of immiscibility, the field being minimal around 400-500°C expanding above or below this range for a constant P. a moderately saline brine can change to a very saline one by phase separation at high T. The presence of NaCl decreases the activity of H2O and increases that of CO2 thus affecting the decarbonation and dehydration reactions. [R.K.H.]
Subjects:Brines; Carbon dioxide; Equations of state; Geochemistry; Immiscibility; P-T conditions; Phase equilibria; Sodium chloride; Titration; Water; NaCl-H<2`O-CO<2`
Abstract Numbers:96M/1691
Record ID:1996012577
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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