肉桂酸型离子液体的合成及其二氧化碳吸收

Synthesis of cinnamic acid-based ionic liquids and application in CO_2 absorption

合成了一系列肉桂酸型功能化离子液体,研究了其CO_2吸收性能。结果表明,肉桂酸型功能化离子液体吸收二氧化碳性能良好,其阴离子苯环上的取代基会影响CO_2吸收性能。随着温度的升高和压力的降低,其CO_2吸收性能都会降低。同时,该离子液体具有很好的循环稳定性,经过5次吸收脱附循环,该离子液体仍能保持较高的CO_2吸收量。结合红外光谱和其低浓度下CO_2的吸收研究发现肉桂酸型离子液体吸收CO_2存在着化学作用。

A series of cinnamic acid-based ionic liquids [P66614][CIN] were prepared and applied in the CO_2 absorption. The results showed that the cinnamic acid-based ionic liquids exhibited good CO_2 absorption performance. The CO_2 absorption ability was influenced by the substituent in the cinnamic acid. The CO_2 absorption capacity would decrease with increasing temperature or decreasing pressure. Furthermore, these ionic liquids exhibited excellent reversibility since higher CO_2 absorption capacity can be maintained after 5 times of absorption/desorption circulation. The results of a combination of FT-IR spectrum and CO_2 absorption under 10% CO_2 indicated that CO_2 was absorbed by chemisorption.