Novel Green Solvents for CO2 Capture

This study investigates the viability of novel green solvents for carbon capture. Three different types of amine based deep eutectic solvents were synthesized at three different molar ratio. The selected amines represent the primary (monoethanolamine), secondary (diethanolamine) and tertiary (methyldiethanolamine) amines, respectively. The CO₂ absorption was conducted with a solvent screening set-up (SSS) and the CO₂ loading was measured with an 'Elementar' total organic carbon (TOC) analyzer. Thereafter, FTIR of the samples was conducted in order to determine the qualitative analysis for tracking the appearance, disappearance and stability of different functional groups (400-1600 cm-1). The solubility experiments were performed based on the conditions of the absorber in the post-combustion capture process (P_CO2 = 15kPa and T = 40^oC). Results revealed that amine-based DESs have absorption capacity that is much higher than both 30wt% aqueous amine solutions and conventional DESs. The FTIR broadening of the O-H and N-H stretching of MEA and ChCl individual components, indicates the formation of hydrogen bonds between the two of them in the ChCl-MEA 1:6 before CO2 absorption.