Abstract
Eutectic solvents (ESs) have attracted considerable attention as CO2 absorbents due to their tunable and unique properties. In this study, ESs based on choline chloride (ChCl) as hydrogen bond acceptor were combined with four different hydrogen bond donors (HBDs): urea, formamide, monoethanolamine and 1-aminopropan-2-ol, in different molar ratios. The impact of the primary amino group in HBD, with particular focus on the functional groups present in the vicinity, on the physicochemical and structural properties of the ESs was investigated. The CO2 capture in these ESs was measured. 13C NMR, FTIR and Raman analyses were performed to provide evidence of chemical and structural changes after CO2 capture. Quantum chemical methods were used to investigate the interaction mechanism between the ESs and CO2. The resulting ESs were characterised by measuring their basic physicochemical properties, including melting point, density and viscosity as a function of temperature. A three-parameter correlation equation was proposed to predict the solubility of CO2 in ChCl-based physical absorbents. It is shown that the use of the free volume parameter of ESs can help to identify alternative CO2 absorbents.
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