Anticorrosion Protection by Amine–Ionic Liquid Mixtures: Experiments and Simulations

High Resolution Image Download MS PowerPoint Slide The mixtures of aqueous amines and ionic liquids (ILs) are considered as potential solvents for CO 2 capture. We report corrosion and CO 2 absorption behavior of the mixed IL–amine solutions. The absorption tests were performed at 318.15 K under 0.1–2.7 MPa. The corrosion tests were carried out at 318.15 K under 2.7 MPa. Addition of [bmim][BF 4 ] in aqueous alkanolamine solutions reduces corrosion rate for MEA by up to 72%. The CO 2 absorption capacity in the mixtures falls between those of aqueous MDEA and pure IL. These results allow to choose the working pressure range as a function of other parameters, such as gas pressure and mixture viscosity. According to the simulations, [bmim][BF 4 ] participates in the gas capture through H-bonding, although the number of amine molecules is enough to capture all supplied CO 2 molecules. The equilibrium of the chemisorption reaction is, therefore, modified upon the stepwise IL addition. An ideal IL content for preventing corrosion is 10% w/w.