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However, the synthesis of these conventional ILs is always complex, the biodegradability is often poor, and the price is relatively high. Figure 1.2. Typical cations and anions constituting ILs [18]. Recently, choline -based ILs were developed and considered as novel ILs. These ILs can be used as liquid absorbents for CO2 separation, taking advantages of high acid-gas solubility, easy synthesis, bio-degradability and low price. Abbott’s group firstly reported the properties and applications of a series of choline-based ILs [27-30]. Among these series ILs, choline chloride-based ILs are becoming a hot topic with a rapid increasing number of publications [31-36]. However, compared to the conventional ILs, the research work on the gas solubility and properties of choline chloride-based ILs is still limited [37]. In general, the viscosities for both conventional ILs and choline chloride-based ILs are relatively high, and this will be a potential obstacle for their application in CO2 separation. To achieve a low viscosity, one approach is to design novel ILs with low viscosity. It has been reported that the ILs composed of imidazolium cation with an allyl group have moderate viscosity at room temperature, and the ILs with anions comprising of a carboxylic acid generally have low viscosity [38, 39]. 1-allyl-3-methylimidazolium formate ([Amim][HCOO]) is one of this kind of ILs, and it has been studied in cellulose chemistry [40-42]. However, the performance of [Amim][HCOO] as a liquid sorbent for CO2 separation has not been studied. The other approach to decrease viscosity is to adding co-solvents (e.g. water) to ILs. It has been found that the addition of water decreases the viscosity of ILs dramatically [43, 44]. Meanwhile, water is an important impurity of gas streams and the involvement of water will affect the properties of ILs and gas solubility. Therefore, it is also important to study the water effects on the gas solubility and properties of ILs. 4PDF Image | CO2 Separation with Ionic Liquids
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