Permeability and Selectivity of Sulfur Dioxide and Carbon Dioxide in Supported Ionic Liquid Membranes
Permeability and Selectivity of Sulfur Dioxide and Carbon Dioxide in Supported Ionic Liquid Membranes
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负载离子液体膜中二氧化硫和二氧化碳的渗透性和选择性
DOI：
10.1016/s1004-9541(08)60249-9
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发表时间：
2009-08-01
影响因子：
3.8
通讯作者：
Zhang Zhibing
中科院分区：
文献类型：
--
作者：
Jiang Yingying;Wu Youting;Zhang Zhibing
研究了二氧化碳（CO2）、二氧化硫（SO2）、氮气（N2-）和甲烷（CH 4）等气体在6种咪唑类离子液体中的渗透性和选择性（[emim][BF4]，[bmim][BF4]，[bmim][BF6]，[hmim][BF4]，[bmim][Tf 2N]和[emim][CF 3SO 3]）在单一气体进料系统中，使用氮气作为环境和参比组分，在25 - 45 ℃的温度下，研究了支撑在聚醚砜微滤膜上的C和100至400 kPa的N-2压力。结果表明，SO2的渗透率最高，比CO2高1个数量级，比N2-和CH 4高2 ~ 3个数量级。观察到的SO2对两种普通气体组分的选择性也是惊人的。实验结果表明，气体组分在支撑离子液体膜中的溶解和传输以及离子液体的性质对气体渗透起着重要的作用。对于所有的样品气体，渗透速率与温度和操作压力的非线性增加也被观察到。通过对影响CO2和SO2渗透性和选择性的因素的综合分析，有望在不久的将来开发出一种最佳的分离酸性气体的支撑离子液体膜技术。
Permeabilities and selectivities of gases such as carbon dioxide (CO2), sulfur dioxide (SO2), nitrogen (N-2) and methane (CH4) in six imidazolium-based ionic liquids ([emim][BF4], [bmim][BF4], [bmim][BF6], [hmim][BF4], [bmim][Tf2N] and [emim][CF3SO3]) supported on polyethersulfone microfiltration membranes are investigated in a single gas feed system using nitrogen as the environment and reference component at temperature from 25 to 45 degrees C and pressure of N-2 from 100 to 400 kPa. It is found that SO2 has the highest permeability in the tested supported ionic liquid membranes, being an order of magnitude higher than that Of CO2, and about 2 to 3 orders of magnitude larger than those of N-2 and CH4. The observed selectivity Of SO2 over the two ordinary gas components is also striking. It is shown experimentally that the dissolution and transport of gas components in the supported ionic liquid membranes, as well as the nature of ionic liquids play important roles in the gas permeation. A nonlinear increase of permeation rate with temperature and operation pressure is also observed for all sample gases. By considering the factors that influence the permeabilities and selectivities Of CO2 and SO2, it is expected to develop an optimal supported ionic liquid membrane technology for the isolation of acidic gases in the near future.