溴代N-丁基吡啶离子液体的合成及吸收CO_2性能研究

Synthesis and CO_2 Absorption Efficiency of N-butylpyridinium Bromide Ionic Liquid

以吡啶、溴代正丁烷为原料合成了溴代N-丁基吡啶离子液体（[bpy]Br）,使用红外光谱、核磁共振氢谱分析方法对产物结构进行了表征。运用热重-差示扫描量热仪（TG-DSC）对离子液体的热稳定性进行测定,结果表明离子液体[bpy]Br的液态温度为99.3-238.0℃。实验研究了离子液体[bpy]Br对CO_2的吸收性能和离子液体再生后对CO_2的吸收负荷。结果表明：随着离子液体[bpy]Br质量分数的增加,离子液体吸收CO_2的负荷增加;随着吸收温度的升高,离子液体吸收CO_2的负荷减少;随着通入CO_2流量的增加,离子液体吸收CO_2达到饱和的时间缩短。离子液体再生后对CO_2的吸收性能基本不变。

N-butylpyridinium bromide ionic liquid was synthesized using pyridine and N-Butyl bromide. The structure of the productwas characterized by IR spectra and 1 H-NMR spectra. The thermal stability of the ionic liquid is detemined by thermogravimetry-differ-ential scanning calorimeter （TG-DSC）, and the result showed that the liquid temperature of N-butylpyridinium bromide ionic liquid is99.3 - 238 ℃. The CO2 absorption capacity of N-butylpyridinium bromide ionic liquid and the regenerated N-butylpyridinium bromideionic liquid （ after absorbing CO2 ） was studied. The results showed that the amount of CO2 absorbed by the ionic liquid increases withthe mass fraction of the ionic liquid increasing, decreases with the absorption temperature rising, and the time when the ionic liquid rea-ches to saturation becomes short with the flow rate of CO2 increasing. Compared with the original ionic liquid, the CO2 absorption capaci-ty of the regenerated ionic liquid has little change.