Solubility of carbon dioxide in aqueous solutions of amino acid salts

The solubility of CO₂ in aqueous solutions of potassium glycinate was measured in a stirred reactor, at temperatures from 293 to 351 K, for amino acid salt concentrations ranging between 0.1 and and CO₂ partial pressures up to . CO₂ solubility in potassium threonate was also measured at 313 K. It was observed that amino acid salt solutions can be very interesting for CO₂ absorption purposes since they present considerably high absorption capacities. Nevertheless, CO₂ solubility in these solutions does not change significantly for temperatures between 293 and 323 K, which can be a draw back concerning the absorbent regeneration.Potassium glycinate solubility data were interpreted using the thermodynamically sound model proposed by Deshmukh and Mather 1981. A mathematical-model for equilibrium solubility of hydrogen-sulfide and carbon-dioxide in aqueous alkanolamine solutions. Chemical Engineering Science 36 (2), 355-362] and the empirical Kent and Eisenberg 1976. Better data for amine treating. Hydrocarbon Processing 55(2), 87-90] model.