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CO2 Recovery in Ionic Liquids Xiaoyan Ji, Yujiao Xie Luleå University of Technology, Division of Energy Science/Energy Engineering, Sweden Introduction Carbon dioxide (CO2) recovery (removal or separation) is an important step in the biomass gasification process. Specifically, it helps to obtain products and improve the efficiency of the subsequent processes. For example, in the production of synthetic hydrocarbons with Fischer- Tropsch technology, the inert CO2 is removed to increase the efficiency and selectivity of higher hydrocarbons (C5+). In methanol production, CO2 removal is conducted to obtain a favorable ratio of the gas mixture in order to increase the production yield. In hydrogen production, CO2 is removed to purify hydrogen. For CO2 recovery, there is a commercial technology, amine technology, but its cost is very high and the volatility of amine causes environmental problems. A low-cost and environmentally benign technology for CO2 recovery needs to be developed. Ionic liquids (ILs) are molten salts that do not evaporate and are widely anticipated as potentially environmentally benign solvents. Their properties mostly depend on their chemical constitution, which makes it possible to design a particular IL to meet a specific application. ILs have shown great potential to be used as liquid absorbents for CO2 recovery, because of their high CO2 solubility relative to other common components, such as hydrogen H2, nitrogen N2, carbon monoxide CO, oxygen O2, and methane CH4, and lower energy requirement for regeneration. It has been estimated that IL technology could cut the costs of capturing CO2 from coal-fired power plants to as low as US$20 per ton (Quick, 2009). A significant amount of research has been carried out in this area, but most of it is on the synthesis of novel ILs, and the experimental data is 67PDF Image | BIOMASS TO ENERGY AND CHEMICALS HighBio2 Project Publication
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