论文部分内容阅读
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) functional ionic liquids have good selective absorption properties for CO 2 and will have a good application prospect in the field of carbon dioxide absorption engineering. For the [APMim] Br ionic liquid aqueous system, the efficient absorption of CO 2 by the fluid can be effectively achieved only when the water content is large enough, and the water content in the effective absorption zone (water content greater than 55%) has a great effect on the CO 2 absorption efficiency of the solution system Significant impact. For this purpose, dissolved in an aqueous solution of [APMim] Br with a mass fraction w (H 2 O) of 0.5590, 0.6578, 0.7680 and 0.8576 for CO 2 at 5 ~ 75 ℃ and 0.1 ~ 7.6 MPa in a closed quartz glass reactor characteristic. The experimental results show that chemical absorption takes the leading role under low pressure. With the increase of water content, the solubility of CO 2 in the solution system increases exponentially, and the physical absorption effect produced is far greater than the chemical absorption capacity of the ionic liquid itself. When the mass fraction of water is in the range of 0.65 ~ 0.85, [APMim] Br aqueous solution has excellent CO 2 aspiration and desorption characteristics over a wide range of temperature and pressure, which shows a good engineering application prospect.