Modeling and experiments of equilibrium solubility of carbon dioxide in aqueous N -(2-hydroxyethyl) pyrrolidine solution

Abstract In this work, the equilibrium CO 2 solubilities of the aqueous N -(2-hydroxyethyl) pyrrolidine ( N -(2-HE) PRLD) at different concentrations (1.0 mol/L–5.0 mol/L) were measured at different temperatures (298 K–333 K) and pressures (8 kPa–101 kPa), using a vapor–liquid equilibrium apparatus. Four semi-empirical thermodynamic models (C f model, Kent–Eisenberg model, Hu–Chakma model and Li–Shen model) were used to correlate and predict the CO 2 solubility data of the N -(2-HE) PRLD-CO 2 –H 2 O system. The results showed that the Hu–Chakma model, which is one of the models that incorporates the effect of amine concentration and CO 2 loading, and accounted for nonideality caused by higher temperature, species concentrations and CO 2 loadings, was best able to predict results that are in agreement with the experimental vapor–liquid equilibrium measurements in this work.