Physical absorption of carbon dioxide in imidazole-PTSA based deep eutectic solvents

Capture of CO2 with high efficiency is essential to tackle the global warming issue that has aroused widespread attention. Herein we employed the halogen-free deep eutectic solvents (DESs) consisting of imidazole (Im) and p-toluenesulfonic acid (PTSA) to absorb CO2. The CO2 solubility in [3Im:PTSA], [3.5Im:PTSA], and [4Im:PTSA] is measured in the range of temperature from 303.15 to 333.15 K and pressure from 110 to 1500 kPa. Henry's constants of...