Solubility of carbon dioxide in a choline chloride–ethylene glycol based deep eutectic solvent

The solubility of carbon dioxide in a eutectic mixture containing choline chloride and ethylene glycol was determined for temperatures 303.15–343.15 K and pressures up to 6 MPa using a thermogravimetric microbalance. The effects of buoyancy on the experimental measurements were accounted for. Buoyancy corrections were estimated by using a highly accurate equation of state in the calculation of the density of carbon dioxide, and a Tait-type equation in estimating the density of the deep eutectic solvent. An extended Henry's law equation was applied to accurately represent the solubility of carbon dioxide in the DES (in molality) as a function of temperature and pressure.

► The solubilities of carbon dioxide in a eutectic mixture of choline chloride and ethylene glycol were measured.
► The pressure was up to 6.3 MPa.
► The temperature studied was 303.15–343.15 K.
► The measured data were reported as functions of temperature and pressure.
► The measured data were represented satisfactorily by the applied correlation.