In the Hot Potassium Carbonate Process, carbon dioxide (CO 2 ) is removed from gaseous streams by chemical absorption in an aqueous solution of potassium carbonate (K 2 CO 3 ). It is common to activate the solvent by adding borates and vanadates as promoters. In the present investigation, we investigate the influence of borates and vanadates on the equilibrium solubility of CO 2 in aqueous solutions of K 2 CO 3 . The solubility of CO 2 in four activated aqueous solutions of K 2 CO 3 was determined experimentally at two temperatures that are typical for CO 2 absorption (343 K) and solvent regeneration (383 K) in the Hot Potassium Carbonate Process. The mass fraction of K 2 CO 3 in the solvent was 0.26 g/g, and the mass fractions of boron (vanadium) was varied between 0.006 g/g and 0.013 g/g (0.01 g/g and 0.02 g/g). Two experimental setups were used: A headspace gas chromatography technique was applied to determine the solubility of CO 2 at partial pressures of CO 2 between 1 kPa and 140 kPa, and the synthetic gas solubility technique was applied for total pressures between 0.4 MPa and 10 MPa. The new experimental results are compared to predictions from a physicochemical thermodynamic model for the solubility of CO 2 in aqueous solutions of K 2 CO 3 that is based on the extended Pitzer equation for describing the nonidealities of the electrolyte solution. The results reveal that both the borate and the vanadate reduce the solubility of CO 2 in such solutions. The new model provides a physicochemically sound basis for process simulation of the Hot Potassium Carbonate Process.a Potassium dichromate is ineffective when H 2 S is present in the raw gas. 52 b For example, piperidine, morpholine, imidazole.
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