Solubility of NaCl in CO2 at high pressure and temperature: First experimental measurements

Details Solubility of NaCl in CO2 at high pressure and temperature: First experimental measurements Solubility of NaCl in CO2 at high pressure and temperature: First experimental measurements

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007gecoa..71.4251z&link_type=abstract

Geochimica et Cosmochimica Acta, Volume 71, Issue 17, p. 4251-4255.

Computer Science

1

Scientific paper

NaCl solubility in gaseous carbon dioxide has been measured in the pressure range from 30 to 70 MPa at 623 and 673 K. Our originally-designed high pressure apparatus allows in situ sampling of a portion of the fluid phase for chemical analysis. The results indicate that the solubility of NaCl increases with both temperature and pressure, and is about 4 5 orders of magnitude higher than saturated NaCl pressure values at the same temperature conditions (6.02 × 10-12 at 623 K and 1.51 × 10-10 at 673 K). It is also 1 2 orders of magnitude greater than predictions according to the Equation of State of the ternary H2O CO2 NaCl system by Duan, Moeller and Weare [Duan, Z., Moller, N., and Weare, J. H. (1995) Equation of state for the NaCl H2O CO2 system: prediction of phase equilibria and volumetric properties. Geochim. Cosmochim. Acta59, 2869] and has the opposite pressure dependence. The activity values of NaCl in the vapor phase, calculated from the experiments (with pure molten NaCl as a standard state in the vapor), have been fitted to the Darken Quadratic Formalism: RTlna=RTlnx-2WNaCl COG·x+BNaCl COG, where, xNaCl,v is mole the fraction of NaCl in the vapor phase, WNaCl COG=(1936.3-43.669·P)×10, BNaCl COG=83,754-420.1·P, where P is the pressure in MPa and T the absolute temperature. Caution should be exerted while extrapolating this empirical equation far beyond the experimental P T-compositional range.

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