The solubility of CO 2 in NaCl solutions with mass fractions of 0.01 to 0.03 was measured at (30 to 60) °C and (10 to 20) MPa. The CO 2 was dissolved in NaCl solution in a pressurized vessel, and a sample of the saturated solution was removed from the vessel. The solubility was then estimated by measuring the mass of the sample and the pressure of the dissolved gas. On the basis of this experimental data, an equation for predicting the CO 2 mole fraction x 1 in NaCl solution as a function of temperature t ) (30 to 60) °C, pressure P ) (10 to 20) MPa, and mass fraction, S, of NaCl ) (0.01 to 0.03) was determined. H(P,T,S)/MPa ) 36.1P/MPa + 3.87T/K -1097.1 + (196P/MPa + 26.9T/K -8810)S, where H is Henry's coefficient, H ) P c /x 1 , P c is the partial pressure of carbon dioxide, T is the absolute temperature, and S is the mass fraction of NaCl in the aqueous solution.

The viscosity of aqueous NaCl solutions with dissolved CO 2 was measured at conditions representing an underground aquifer at a depth of (1000 to 2000) m for the geological storage of CO 2 (i.e., (30 to 60) °C and (10 to 20) MPa at a mass fraction of NaCl between 0 and 0.03 by using a sedimenting solid particle type viscometer with an estimated uncertainty of (2%). On the basis of this experimental data, an empirical equation for predicting this viscosity as a function of the temperature and mole fraction of CO 2 for these conditions was derived.

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