The solubility of CO 2 in three cellulose-dissolving ionic liquids (1-ethyl-3-methylimidazolium diethylphosphate, [Emim][DEP], 1-allyl-3-methylimidazolium chloride,[Amim][Cl], and 1-butyl-3-methylimidazolium chloride, [Bmim][Cl]) at temperatures within298 and 356 K and pressures up to 6.5 MPa was determined using a Van Ness-typeapparatus (static isochoric). It was demonstrated that this device can work in isothermaland isoplethal modes, being the latter faster and more precise. Moreover, it was possibleto determine CO2 solubilities in metastable liquid [Bmim][Cl]. Experimental data weremodeled using the Extended Henry's law correlation and the group contribution equationof state. New parameters for the binary interaction of CO2 with ionic liquid groups werecalculated
