离子液体吸收CO_2的研究进展

CO2的捕集、分离与利用已成为人类共同关心的重要课题。工业上,通常使用传统的有机胺水溶液或热钾碱溶液等脱除CO2。有机胺具有蒸气压,易产生挥发性有机物(VOCs)对环境造成污染;热钾碱溶液等脱除CO2需要较高操作温度因而能耗较高,生产过程经济性有待改善。离子液体具有几乎无蒸气压、热稳定性、结构可设计性等独特优点,在CO2分离领域的巨大应用潜力已成共识。本文结合课题组近期的研究工作,就国内外离子液体吸收CO2的主要研究成果进行综述。

Progress in CO2 Absorption by Ionic Liquids

Capturing, separating and utilizing carbon dioxide （CO2） is now extensively concerned in the world. In industrial applications, aqueous amines or potassium -based aqueous solution are widely adopted in CO2 scrubbing from gas mixtures. However, the aqueous amines release a large amount of VOCs because of the absorbents＇ vapor pressure. The potassium - based aqueous solution method costs large energy consumption due to high operational temperature. These are the problems demanding proper solution in existing processes. As a potential and environmentally benign solvent in CO2 separation, ionic liquid provokes a wide interest due to its unique characteristics such as negligible vapor pressure and designable structure. Combining with recent studies of our group, those important researches on CO2 solubility in both ordinary ionic liquids and task specific ionic liquids, as well as the factors influencing on the viscosity of ionic liquids, were summarized.