Solubilities of Carbon Dioxide in Five Biobased Solvents

Solubilities of CO2 in five biobased solvents (BBSs) were measured at temperatures ranging from 283.15 K to 323.15 K with 10 K intervals under a pressure of 0 kPa to 600.0 kPa using an isochoric saturation method. The BBSs include dibutyl succinate (DBS), gamma-valerolactone (GVL), furfuryl alcohol (FA), ethyl levulinate (EL), and butyl levulinate (BL). Henry's constant and thermodynamic properties (dissolution Gibbs free energy, dissolution enthalpy, and dissolution entropy) were derived from the solubility data. The obtained results demonstrated that the solubilities of CO2 in BBSs followed the sequence of BL ≈ EL ≈ GVL ≈ DBS > FA. The enthalpies of solution were negative at all conditions. The solubilities of CO2 in BBSs were further compared with those in ionic liquids (ILs) and ordinary absorbents, indicating that BBSs demonstrated similar absorption capacity with the commercial absorbent of polyethylene glycol dimethyl ether (NHD) except for FA.