Thermodynamics of CO2 separation with the superbase derived ionic liquid - organic solvent binary system

In this work, the CO2 absorption capacity of superbase derived ionic liquid, i.e., 1,8-diazabicyclo [5,4,0] undec-7-ene imidazole ([HDBU][IM]) mixed with three different cosolvents (dimethyl ethers of polyethylene glycol (DEPG), propylene carbonate, and ethylene glycol) was studied, and [HDBU][IM]-DEPG was selected for further investigation, showing [HDBU][IM]-DEPG with 2:1 mass ratio at the temperature of 298.15 K exhibits the optimal performance of CO2 absorption capacity and viscosity. The gas solubilities for CH4, N-2, and two gas mixtures (75% N-2 + 25% CO2; 60% CH4 + 40% CO2) were studied, indicating the selectivity can be up to 17, and the real selectivity is higher than the ideal one. Thermodynamic modelling was carried out, and the species distributions, as well as the physical and chemical contributions, were analyzed, illustrating the reliability of the thermodynamic model with an average relative deviation lower than 2.37%. The decreased DEPG content and increased temperature favor chemisorption, contributing more than 90% when the pressure was lower than 0.4 MPa, while with increasing pressure, the physical contribution gradually increases up to 30%. This work evidences that [HDBU] [IM]-DEPG is an excellent candidate for CO2 separation due to its high CO2 absorption capacity and low viscosity, and the high CO2 selectivity over CH4 and N-2 expands its capability for real industrial applications. (C) 2021 Published by Elsevier B.V.

Automated summary

This study investigated the CO2 absorption capacity of superbase derived ionic liquid [HDBU][IM] mixed with different cosolvents, and found that [HDBU][IM]-DEPG with a 2:1 mass ratio at 298.15 K exhibited optimal performance. The research also analyzed gas solubilities, thermodynamic modeling, and the contributions of chemisorption and physical absorption, indicating the potential of [HDBU][IM]-DEPG for CO2 separation in real industrial applications.