Gas solubilities in room temperature ionic liquids – Correlation between RTiL-molar mass and Henry's law constant

The solubility of CO2, CH4, N2, and CO was measured in a broad number of ionic liquids using a pressure drop set-up. A successful correlation of the Henry's law constants at 60 °C was made to two empirical models already described in literature (Camper et al. [13] and Moganty and Baltus [25]). Subsequently, a new empirical model was proposed, which describes the Henry's law constant as a function of the molar mass of the ionic liquid, as long as physical interactions between gas and ionic liquid are dominant. Additionally, the entropy and enthalpy of solvation was studied by means of the temperature influence to the Henry's law constant.

► Physical absorption of CO2, N2, CH4, and CO in various ionic liquids at 60 °C. ► Henry's law constants were determined. ► 2 literature models were applied successfully to CO2, N2, and CH4. ► Correlation of reciprocal molar mass and Henry's law constant was done successfully.