Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

Carbon capture and storage (CCS) is one of the technologies needed to reduce anthropogenic emissions of CO2 in the atmosphere. Protic ionic liquids (PILs) are potential non-aqueous solvents, which can combine the benefits of ionic liquids (ILs) and deep eutectic solvents (DESs) to make the carbon capture process more sustainable. In the present study, viscosities of six eutectic based solvents have been measured within a temperature range of 303.2 K 330.2 K and have been modelled using a Vogel-Fulcher-Tammann (VFT) type equation. The results showed that guanidium malate based eutectic solvents have significantly lower viscosities than most other deep eutectic solvents. Additionally, CO2 solubilities in three different guanidium based eutectic solvents have been measured within a temperature range of 313.2 333.2 K and pressures of up to 200 kPa. Henry s law constants of CO2 in pure solvents were obtained by modelling the solubility in mixed (aqueous) solvents. The values obtained for Henry s law constants of CO2 in the studied guanidium based eutectic solvents were found to lie within a range of 1.3 24 MPa. The values of Gibbs free energy, dissolution enthalpy and entropy showed that the CO2 absorption is exothermic and after CO2 absorption, the entropy of the systems decreased.