Abstract
The solubility of Na 2 SO 4 in aqueous CO 2 solutions has been measured at 50 and 75°C and pressures to 200 bar. To calculate the effect of gas concentration on the solubility of the salt, we use thermodynamic-consistency equations that relate the solubility of the salt to the Setschenow constant and other thermodynamic properties. The effect of pressure on the salt solubility is estimated from volumetric data for the aqueous electrolyte solution and for the solid salt. Calculated and experimental results are in good agreement. By use of the thermodynamic-consistency analysis, predictions are made for the solubility of NaCl in aqueous solutions containing CO 2 or CH 4 , using available data for gas solubility in the respective binary electrolyte solutions. The predicted decrease of NaCl solubility with rising CO 2 concentration is confirmed experimentally at 50°C
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