1-氨丙基-3-甲基咪唑溴盐水溶液对CO_2的吸收特性

Absorption Property of 1-Aminopropyl-3-Methylimidazolium Bromide Aqueous Solutions to Carbon Dioxide

以1-氨丙基-3-甲基咪唑溴盐（[APMim]Br）为功能型离子液体,考察了其水溶液对CO2的吸收性能。实验结果表明,[APMim]Br水溶液的含水量（w）为65%~85%较适宜,在该含水量下,[APMim]Br水溶液对CO2具有优异的吸收-解吸特性。含水量增大可大幅提高[APMim]Br水溶液对CO2的物理吸收能力。随压力的增大,[APMim]Br水溶液对CO2的物理吸收量基本呈线性增长趋势,遵循亨利定律。温度对[APMim]Br水溶液物理吸收能力的影响显著大于对化学吸收能力的影响。当压力一定时,[APMim]Br水溶液对CO2的吸收-解吸范围随含水量的增大而变宽。[APMim]Br水溶液在同等条件下对CO2的吸收能力优于醇胺溶液。

The absorption property of the aqueous solutions of a functional ionic liquid, 1-aminopropyl-3-methylimidazolium bromide （ [APMim ]Br）, to COz was investigated. The results indicated that when the water mass fraction was in the range of 65%-85%, the aqueous solutions had excellent absorption-desorption capacity to CO2. The physical absorption capacity of the solutions to CO2 could increase evidently when the water content increased. In the solution systems, the amount of CO2 physically absorbed by the EAPMiml Br solutions linearly correlated to the pressure rise, which accorded with the Henry＇s law. Temperature had remarkable effect on the physical absorption capacity of the EAPMim~ Br solutions, much greater than that on their chemical absorption capacity. Under a certain pressure, the range of the CO2 absorption-desorption in the IAPMim~ Br solutions widened with increasing the water content. The absorption capacity of the ~APMim] Br solutions to CO2 is superior to that of alkanolamine solutions under the same conditions.