Abstract
In this study, the solubility of CO2 in aqueous solutions of potassium carbonate was measured using pressure-decay method at temperatures of 313.15K, 323.15K, and 333.15K and solution concentrations of 15wt%, 20wt% and 30wt%. Results showed that decreasing temperature and increasing solution concentration enhanced the solubility of CO2 in the solvent. Another important observation which was not studied to date was that the solubility of CO2 increased with increasing pressure until a specific pressure after which it started decreasing. This phenomenon was explained by detail using Henderson–Hasselbalch equation for the bicarbonate formation reaction. Finally, the solubility data was correlated using nonlinear regression. The mean deviation between the experimental solubility and the predicted values by the correlation was less than 3.7%.
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