Facilitated Separation of CO2by Liquid Membranes and Composite Membranes with Task-Specific Ionic Liquids
Facilitated Separation of CO2by Liquid Membranes and Composite Membranes with Task-Specific Ionic Liquids
复制标题
液膜和特定任务离子液体复合膜促进 CO2 分离
DOI：
10.1021/acs.iecr.6b02778
复制
发表时间：
2016
影响因子：
4.2
通讯作者：
Ren Zhongqi
中科院分区：
文献类型：
--
作者：
He Wei;Zhang Fan;Wang Zhi;Sun Wei;Zhou Zhiyong;Ren Zhongqi
Carbon capture and sequestration (CCS) has become an increasingly important technology for environmental protection and resource utilization. In this work, four task-specific ionic liquids (TSILs), NH2-functionalized IL and three ether-functionalized ILs, were synthesized for CO2absorption. CO2absorption experiments of these task-specific ionic liquids (TSILs) showed that the absorption performance of NH2-functionalized IL was higher than that of ether-functionalized ILs. The recycling experiments of CO2absorption demonstrated a good reusability of synthesized TSILs for CO2absorption. Supported ionic liquid membranes (SILMs) with synthesized TSILs were prepared, and the CO2/CH4and CO2/N2separation performance of SILMs was examined. Results indicated that the SILMs with ether-functionalized ILs have slightly lower permeability but much higher selectivity (up to 9.7) than the SILMs with NH2-functionalized IL. Poly(RTIL)-RTIL composite membranes were prepared using ether-functionalized ILs. The effect of cross-linking monomer content and nonpolymerizable IL (“free” IL) content in poly(RTIL)-RTIL membranes on the CO2/CH4and CO2/N2separation performance was investigated. The composite membranes have higher gas permeability with little or no sacrifice in selectivity compared with SILMs. The stability evaluation and comparison of the SILMs and poly(RTIL)-RTIL membranes were conducted, the results of which verified the stronger structural stability of the poly(RTIL)-RTIL membranes. This suggests the potential of poly(RTIL)-RTIL membranes in future CO2-selective membrane separation.
