Experiments for the solubility and phase equilibrium of carbon dioxide in aqueous solution of 1-aminopropyl-3-methylimidazolium bromide([APMIm])with three water concentrations(16.04%
31.59% and 60.84%
mass fraction)
at 278.15—348.15 K and pressure up to 6.5 MPa were performed by using a high-pressure reaction cell based on an isochoric saturation technique.The results indicated that water concentration could greatly enhance the absorption capacity and increase the absorption rate of carbon dioxide in[APMIm] aqueous solution.For the 60.84% aqueous IL solution at 5℃ and 120 kPa
CO2 solubility was up to 0.459 mol CO2·(mol IL)-1
close to the theoretical maximum absorption capacity of 0.5 mol CO2·(mol IL)-1.Under a higher pressure(3.9 MPa)
maximum CO2 absorption was 1.894 mol CO2·(mol IL)-1.