Understanding the physical and thermodynamic properties of monoethanolamine‐ionic liquids for solvent screening in CO₂ capture process

Abstract

The physical properties such as density, surface tension, and viscosity of monoethanolamine (MEA)-ionic liquids (ILs) solvent mixtures were studied experimentally in this work. The ILs namely, tetrabutylammonium acetate TBAAc, tetrabutylammonium bromide TBABr, and tetrabutylammonium hydroxide TBAOH were used. All the above parameters were measured at atmospheric pressure and various temperatures from 283 to 313 K with a 10 K interval.From the measured experimental data, thermodynamic properties such as thermal expansion, excess molar volume, viscosity deviation, and excess Gibbs free energy were also calculated. The physical and thermodynamic properties are more important to understand the solvent behavior during solvent screening in solvent-based CO 2 capture process. The 30 wt% solvent mixture composition was prepared as 28, 25, and 20 wt% MEA mixed with 2, 5, and 10 wt% ILs. Furthermore, a single empirical model was developed from the measured experimental data and the results are correlated. A good agreement was obtained between correlated and experimental data.

Measurement of physicochemical properties of green aqueous amino acid‐based ionic liquids and their correlation with temperature and concentration

“…Over the past years, ionic liquids (ILs) have attracted immense attention as unique solvents, due to their low vapor pressures, high thermal-chemical stabilities, and the tunability of their cationic and anionic structural moieties. [1][2][3] Besides being nonflammable material, some types of ILs found to be relatively environmentally friendly with less health and safety impact on human lives. 4,5 ILs have been utilized for several applications such as catalysis, CO 2 capture, and gas hydrates inhibition.…”