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ChCl/Urea (1:2) was determined by Karl Fischer titration analysis, which was 1200 ± 100 ppm. 2.1.3 Synthesis of 1-allyl-3-methylimidazolium formate The 1-allyl-3-methylimidazolium chloride was prepared. 0.25 mol redistilled 1-methylimidazole and acetonitrile (250 mL) was mixed, stirred and cooled in an ice–salt bath, and then 0.375 mol of allyl chloride was added dropwise while maintaining the temperature below 5 °C. The mixture was stirred at 60 °C for 24 h under nitrogen atmosphere and then cooled down to the room temperature. The volatile material was removed from the resulting yellowish solutions under reduced pressure. The remaining light-yellow oil was re-dissolved in isopropanol (ca. 50 mL). Tetrahydrofuran (THF) was added (ca. 500 mL), and the white solid precipitated out. The white solid was filtered and then dried under high vacuum for 6 h. 10.0 g amberlite IRA-400(R-OH) in deionized water was loaded in a 20 cm × 1.5 cm chromatography column. 1-allyl-3-methylimidazolium chloride (2 g) was dissolved in 50 mL deionized water, and the solution was loaded to the column carefully. This solution was passed through the column with the flow rate of 1 mL/min followed by deionized water (50 mL). The eluent was collected. 1-allyl-3-methylimidazolium hydroxide was neutralized by an equimolar quantity of formic acid (with respect to 1-allyl-3-methylimidazolium chloride). The prepared 1-allyl-3-methylimidazolium formate ([Amim][HCOO]) was dried by heating at 60 °C under high vacuum (4 10-2 mbar), followed by freeze drying. The water content of the dry [Amim][HCOO] was determined by Karl Fischer titration analysis, which was 5000 ± 200 ppm. 2.2 Density and viscosity measurement The density of dry and aqueous ChCl/Urea was measured by DMA 5000 vibrating-tube densimeter. The accuracies of temperature and density are 0.01 K and 0.00005 g·cm-3, respectively. The viscosity of dry and aqueous ChCl/Urea was measured by Anton Paar AMVn Automated Mircoviscometer according to Hoeppler's falling ball principle. Various combinations of capillary/ball with different diameters (1.6 mm, 1.8 mm, 3.0 mm, 4.0 mm, 8PDF Image | CO2 Separation with Ionic Liquids
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