Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

Solubilities of CO2 have been measured in five low volatile organic solvents at temperatures ranging from 293.15 to 323.15 K with 10K intervals under a pressure of 0 to 600.0 kPa using an isochoric saturation method. These organic solvents were selected from -butyrolactone (GBL), butyl lactate (BL), 1,1,3,3-tetramethylurea (TMU), 1,3-dimethyl-2-imidazolidinone (DMI), and 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone (DMPU). Henry s constants and thermodynamic properties such as Gibbs free energy, enthalpy, and entropy of dissolution were derived from the corresponding solubility data. The gravimetric solubilities of CO2 in these solvents followed the sequence of TMU greater than DMI BL GBL greater than DMPU. The enthalpies of dissolution were all exothermal at each condition. Henry s constants of CO2 in these solvents were further compared with those in ionic liquids and other ordinary absorbents, and it was found that they were similar to that of CO2 in polyethylene glycol dimethyl ether (NHD), which is widely used in the present industry.