[APMim]Br离子液体溶液水含量对CO_2溶解度影响  

Effects of Water Concentration on Carbon Dioxide Solubility in1-Aminopropyl-3-Methylimidazolium Bromide Aqueous Solutions

作　　者：李松[1] 杨翠莲[1] 毕崟[1] 郭开华[1] 

机构地区：[1]中山大学工学院,广州510006

出　　处：《工程热物理学报》2015年第7期1407-1412,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51076169);广东省自然科学基金重点项目(No.9251027501000001)

摘　　要：1-氨丙基-3-甲基咪唑溴（[APMim]]Br）功能型离子液体对CO_2具有良好的选择吸收特性,在二氧化碳吸收工程领域将有较好的应用前景。对于[APMim]Br离子液体水溶液体系,只有当水含量足够大才能有效地实现流体对CO_2的有效吸收,而且在有效吸收区间（水含量大于55%）水含量多少对溶液体系CO_2吸收效率有着非常显著的影响。为此在密闭石英玻璃反应釜内,测定5~75℃,0.1~7.6 MPa范围内,CO_2在水的质量分数w（H_2O）为0.5590、0.6578、0.7680和0.8576的[APMim]Br水溶液中的溶解特性。实验结果表明,低压下化学吸收占主导作用,随水含量增大,溶液体系对CO_2溶解度成倍增加,而且产生的物理吸收效应远大于离子液体本身的化学吸收能力。在水的质量分数在0.65~0.85区间,[APMim]Br水溶液在相当大的温度和压力范围内具有优良的CO_2吸放气特性,显示出良好的工程应用前景。1-aminopropyl-3-methylimidazolium Bromide （[APMim]Br） exhibits a good selectivity for carbon dioxide （C02） absorption and its aqueous solutions can have a great prospect for CO2 capture. In order to reveal the effects of water concentration on the CO2 solubility in the aqueous solutions, the experiments based on an isochoric technique by using a high-pressure quartz glass cell were performed to test the solutions of 0.5590, 0.6578, 0.7680 and 0.8576 water mass fractions. The equilibrium data for CO2 solubility in these aqueous solutions were obtained in range of 5-75℃ and 0.1-7.6 MPa. The results indicated that the chemical absorption mechanism is predominant at lower pressure while the CO2 solubility can be doubled comparing to the chemical one when the water concentration increased and the physical absorption ability prevailed. In 0.65-0.85 water mass fraction, the solutions have an excellent CO2 absorption and release ability in consider- able large temperature and pressure ranges and may have a promised future for engineering application.

关 键 词：离子液体 水溶液 水浓度 二氧化碳 溶解度 

分 类 号：TK123[动力工程及工程热物理—工程热物理]