Solubility of CO₂ in Ionic Liquids with Additional Water and Methanol: Modeling with PC-SAFT Equation of State

The superior properties of specific ionic liquids (ILs), such as negligible volatility, high thermal stability, flexible designability, and their affinity to capture CO2, make them an attractive alternative chemical physical solvents that are currently used in CO2 processes. However, a limitation use ILs for industrial is viscosity compared conventional solvents, which leads lower rate higher pumping cost. can be reduced by adding co-solvent, water or methanol. In this work, solubility, vapor–liquid equilibria (VLE), liquid–liquid (LLE) binary ternary mixtures involving ILs, water, methanol have been systematically investigated employing perturbed-chain statistical associating fluid theory (PC-SAFT) equation state with two different strategies. were considered self-associating chain molecules association sites the first strategy. As comparison, they regarded strong electrolytes dissociate into anions cations second It was found both strategies provide accurate correlations modeling solubilities LLE ILs/water systems. Four systems selected verify predictive capability For water-containing systems, performed excellently when interaction parameters (BIPs) obtained fitting experimental data, while poorly system few data. cases where acted predictions strategies, even without any BIPs. PC-SAFT potential practical tool develop processes new there sufficient data mixtures.