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.