Synthesis, Characterization, Physical Properties, and CO2 Absorption Performance of Monoethanolamine Glycinate Ionic Liquid

A new amino acid-functionalized ionic liquid (IL), monoethanolamine glycinate ([MEA][GLY]), was synthesized and characterized. Its physical properties were measured, including density, viscosity, surface tension, conductivity, and refractive index. The solubility of CO2 in [MEA][GLY] was determined. The ability of [MEA][GLY] to absorb CO2 was evaluated. [MEA][GLY] with an active amino group exhibits representative physical properties of a functionalized IL. The solubility of CO2 in the IL is more than 0.5 mol CO2/mol IL at room temperature and atmospheric pressure. The [MEA][GLY] and aqueous [MEA][GLY] ILs are thus good absorbents of CO2. The CO2 partial pressure and [MEA][GLY] concentration have a significant impact on their absorption.