| Carbon dioxide is regarded as the most significant greenhouse gas, the increasingly accumulation of CO2 in the atmosphere has attracted worldwide attention. CO2 can be absorbed by amino-containing ionic liquids(ILs). CO2 is one of the carbon resources. The advantage of absorbing CO2 by ILs is obvious. The technology has brought new opportunities for the protection of the environment.The advantage of task-specific ionic liquids(TSILs) is non-polluting, non-volatile, heat stability, excellent conductivity and so on. To utilize ILs, two problems need to be resolved. Because the property data of ILs are scarce, and the viscosity of ILs are large, which affects the absorption effect of CO2. So we hope to find an effective way to reduce the viscosity of TSILs.[NH2e-mim]Br and [NH2-G]Br are synthesized by using microwave, [NH2e-mim]BF4 and [NH2-G]PF6 are synthesized by using anion exchange. The optimum synthetic conditions are determined by the experiments. The optimum conditions of [NH2e-mim]Br were power 300W, reaction time 75s, reaction temperature 45℃.The optimum conditions of [NH2-G]Br were power 300W, reaction time 75s reaction temperature 50℃. The structure of products were determined by IR, HNMR. The purity of products were [NH2e-mim]Br(98.0%), [NH2e-mim]BF4(97.9%), [NH2-G]Br(98.2%) and [NH2-G]PF6(97.6%). The density, viscosity, conductivity and solubility in different solvents were measured. The results show that the density and viscosity decrease with the increasing of temperature and moisture content, the conductivity increases with the increasing of temperature and moisture content.The experimental results show that CO2 can be absorbed by TSILs better than conventional ILs and traditional organic amines, because of the chemical reactivities between CO2 and alkaline groups of TSILs. The absorption can be improved by increasing pressure. The solubility of CO2 in [NH2e-mim]PF6 (0.38MPa, 30℃,without water) could reach 20.19%.
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