Abstract: Two functionalized ionic liquids (ILs) – tetraethylammonium alaninate ([N2222][Ala]) and tetraethylammonium serinate ([N2222][Ser]) were synthesized by using the one-step method and verified with IR and 1H NMR, and their glass transition temperature and thermal decomposition temperature were determined. The solubility of CO2 in aqueous blends of N-methyl-diethanolamine (MDEA) and these two ILs were carried out at 40 ℃ and the results showed that both of these two ILs had a positive effect on the absorption of CO2, increasing by 8.63% and 5.40%, respectively, when IL’s concentration was 10%. Moreover, physical properties namely, density and viscosity of these mixed solutions were measured over a temperature range of 20 ℃ to 60 ℃ to provide basic data for further application of ILs.

Key words: MDEA, ionic liquid, CO2, absorption

摘要： 采用一步法合成了两种功能化离子液体四乙铵-丙氨酸盐（[N2222][Ala]）和四乙铵-丝氨酸盐（[N2222][Ser]），利用IR和1H NMR对其结构进行了表征，并测定了其玻璃转化温度和分解温度；同时，在40 ℃下分别将[N2222][Ala]和[N2222][Ser]与MDEA进行复配，考察复配后的体系对CO2吸收性能；实验结果表明，[N2222][Ala]和[N2222][Ser]的加入对MDEA吸收CO2均有不同程度的增强作用，当加入质量分数为10%时，体系对CO2吸收量分别增加了8.63%和5.40%。此外，研究了20～60 ℃温度范围内复配体系的密度、黏度等，并比较了吸收前后黏度的变化。

关键词: N-甲基二乙醇胺, 离子液体, 二氧化碳, 吸收