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2 Experiment In order to develop IL technology, it is essential to obtain thermo-physical properties of pure ILs and their gas solubility. Water is an impurity of gas stream, and it is a green and cheap solvent that can dramatically decrease the viscosity of ILs. In Papers I and II, the properties of two novel ILs and the gas solubility in these ILs were investigated. The density and viscosity of dry and aqueous ILs were determined at atmospheric pressure. The solubility of pure-CO2 and pure-CH4 in dry ILs as well as the solubility of pure-CO2 in aqueous ILs were determined at different temperatures and pressures. The experimental methods for IL preparation and the density, viscosity and gas solubility measurements are described in this chapter. 2.1 IL preparation 2.1.1 Materials Choline chloride (ChCl, mass fraction ≥ 99 %) was produced by Sinopharm Chemical Reagent Co, Ltd, China. Urea (mass fraction ≥ 99 %) was produced by Xilong Chemical Reagent Co, Ltd, China. CO2 (mole fraction ≥ 99.9 %) was received from Beijing Bei Temperature Gas Factory. The chemicals are analytical reagent (A. R.) grade, and they were used as received. 1-methylimidazole and allyl chloride were purchased from Sigma Aldrich Ltd., and allyl chloride was redistilled before further use. Sodium hydroxide ( ≥ 99.8%) was obtained from Merck. Ethanol ( ≥9 9.5%) was purchased from Solveco Ltd. Amberlite IR-400 OH resin was purchased from Sigma Aldrich Ltd. Formic acid ( ≥ 95%) was purchased from Sigma Aldrich Ltd. 2.1.2 Synthesis of choline chloride/urea The mixture of choline chloride/urea (ChCl/Urea) was prepared by heating choline chloride and urea with a molar ratio of 1:2 at 353.15 K until a homogeneous liquid was formed. Samples were dried under vacuum at 333.15 K for 72 h. The water content of the dried 7PDF Image | CO2 Separation with Ionic Liquids
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