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ways of mitigating greenhouse emissions whereby the more efficient CO2 separation from gaseous mixtures is required [2]. Meanwhile, CO2 separation plays an important role in the development of renewable energy production [3,4]. For example, in the production of synthetic hydrocarbons via the Fischer-Tropsch technology, the inert CO2 needs to be removed to increase the efficiency and selectivity towards higher hydrocarbons; in the hydrogen production, CO2 is removed to purify hydrogen; in the biogas production, CO2 is removed to increase the content of methane and render the product suitable as a transportation fuel. A number of CO2 separation technologies have been developed in recent decades. CO2 separation using the current state-of-the-art technology, e.g. the aqueous amine technology, costs $50 to $100 per ton carbon, a cost which is too high to be implemented in the aforementioned applications [5]. In addition, this technology is environmentally unacceptable because of the volatility, corrosivity and instability of the amines. Therefore, it is necessary to explore new cost-effective and environmentally benign CO2 separation technologies. Since Blanchard et al. first reported high CO2 solubility in ionic liquids (ILs) in 1999 [6], ILs have been attracting much attention to be used as liquid sorbents in CO2 separation due to their favorable properties, such as non-volatility, thermal stability, high acid gas solubility, low energy usage for the ILs regeneration, and so forth. Therefore, to develop ILs for CO2 separation, a lot of research work has been conducted focusing on the synthesis of new ILs, and studies of gas solubility and physical properties of conventional ILs. However, the studies of the water influence on the gas solubility and the property of ILs are still limited. This is crucial as water is one of the main impurities in CO2 streams. Meanwhile, the viscosity of ILs is generally high compared to organic solvents, and water is often used as a co- solvent to decrease the viscosity of ILs [7-10]. Another option is to synthesize ILs with low viscosity. Recently, Fukaya et al. [11, 12] found that the ILs composed of the imidazolium cation with an allyl group have low melting points and moderate viscosity at room temperature, and the ILs containing anions comprising of a carboxylic acid are generally the ones having a low viscosity. A particular case is the 1-allyl-3-methylimidazolium formate ([Amim][HCOO]), and it has been studied in cellulose chemistry [13-16]. However, the application of this IL as a liquid sorbent for CO2 separation has never been reported. The goal of this work was to study [Amim][HCOO] as a potential sorbent for CO2 separation. As water is an impurity of gas streams and also a co-solvent that decreases the viscosity and lowers the overall cost of the solvent, the influence of water on the properties and gas solubility was measured experimentally in this work. The experimental data was represented by the empirical equations. The model parameters will be further implemented into Aspen Plus to conduct process simulation for CO2 separation in the future work.PDF Image | CO2 Separation with Ionic Liquids
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