离子液体支撑液膜分离CO2

支撑液膜是一种在湿法冶金、生物技术以及气体分离等多个领域都有应用的重要膜分离技术。本文回顾了支撑液膜技术分离CO2的研究进展,按照液膜相的不同,分类介绍了常规载体支撑液膜和离子液体支撑液膜,指出了常规载体支撑液膜分离CO2的局限性,重点介绍了离子液体支撑液膜分离CO2的发展,分析了气体在离子液体支撑液膜中的传质机理以及常规离子液体结构、含量和支撑膜材料等对分离效果的影响;讨论了离子液体的功能化方法以及功能化离子液体支撑液膜分离CO2的渗透率、选择性和液膜稳定性;介绍了两种新的离子液体支撑液膜改进方法:聚离子液体膜与凝胶化离子液体支撑液膜。最后指出了今后用于CO2分离的离子液体支撑液膜的发展方向。

Separation of CO2 with Supported Ionic Liquid Membrane

Supported liquid membrane(SLM) is a kind of important membrane technique which has applications in many fields such as hydrometallurgy,biotechnology,gas separation,etc.A thorough summary of recent developments of supported liquid membranes used in the field of CO2 separation is provided.In this paper,two kinds of supported liquid membranes with different membrane phases,conventional carriers supported liquid membranes and supported ionic liquid membranes(SILMs),are introduced respectively.And the limits of conventional carriers supported liquid membrane are pointed out.The transport mechanism of gas in the SILMs is analyzed firstly.Then the progress of different SILMs are discussed intensively.For conventional ionic liquid membranes,the discussions focus on how the structure and content of ionic liquid as well as the support material influence the membrane performance.For task-specific ionic liquid membrane,different methods of functionalization and the CO2 permeability,selectivity and the liquid membrane stability of the corresponding supported task specific ionic liquid membranes are analyzed.Two kinds of new modification methods for supported ionic liquid membrane,poly(ionic liquid) membrane and supported gelled ionic liquid membrane,are also introduced.On this basis,the possible prospects of supported ionic liquid in the future are given.