Density and carbon dioxide solubility in aqueous solutions of potassium glycinate

• Bespoke VLE apparatus designed for CO 2 solubility in amino acid salt solutions • CO 2 solubility in aqueous potassium glycinate up to T = 393 K at p ≤ 0.7 MPa • Density measurements for solvent up to T = 393 K at p ≤ 0.7 MPa with CO 2 loading • Glycine salts exhibit higher molar CO 2 uptake than MEA We report measurements of the solubility of CO 2 in aqueous potassium glycinate and of the density of the solution with and without CO 2 loading. The CO 2 solubility was measured with a bespoke static-synthetic vapour liquid equilibrium (VLE) apparatus, while densities were measured with a high-pressure vibrating-tube densimeter. The VLE apparatus was validated by means of measuring the solubility of CO 2 in a 7 mol·kg -1 aqueous ethanolamine solution, and the results were in good agreement with the literature. Three molalities of aqueous potassium glycinate were studied: (1, 2 and 3) mol·kg -1 . The CO 2 solubility measurements were made at temperatures between (313.15 and 393.15) K with pressures up to 0.65 MPa, while the density was measured at temperatures between (298.15 and 393.15) K with pressures up to 10 MPa.