Solubilities of CO2 in some glycol ethers under high pressure by experimental determination and correlation

The binary vapor–liquid equilibrium data of CO 2 in diethylene glycol (monomethyl, monoethyl, monobutyl, dimethyl, diethyl, dibutyl) ether were determined from 288.15 to 318.15 K at pressure up to 6   MPa based on the constant-volume method. It was found by contrast that the ether group in solvents can promote the CO 2 absorption, but the hydroxyl group will inhibit the CO 2 absorption. Furthermore, the solubilities of CO 2 showed an upward trend with the increasing molecular lengths of absorbents. The experimental data were also correlated with a modified Patel–Teja equation of state (PT EOS) combined with the traditional van der Waals one-fluid mixing rules and the results showed a satisfactory agreement between the model and the experimental data.