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Protic ionic liquid-based deep eutectic solvents with multiple hydrogen bonding sites for efficient absorption of NH3 |
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| Authors: | Yongkang Cao Xiangping Zhang Shaojuan Zeng Yanrong Liu Haifeng Dong Chun Deng |
| Affiliation: | 1. Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China College of Chemical Engineering and Environment, China University of Petroleum, Beijing, China;2. Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China College of Chemical and Engineering, University of Chinese Academy of Sciences, Beijing, China;3. Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China;4. Energy Engineering, Division of Energy Science, Luleå University of Technology, Luleå, Sweden;5. College of Chemical Engineering and Environment, China University of Petroleum, Beijing, China |
| Abstract: | The emerging of ionic liquids (ILs) provides an efficient and sustainable way to separate and recover NH3 due to their unique properties. However, the solid or highly viscous ILs are not suitable for traditional scrubbing. Therefore, an effective strategy was proposed by combining the protic ILs (PILs) with acidic H and low viscous ethylene glycol (EG) to form IL-based deep eutectic solvents (DESs) for NH3 absorption. The results indicated that these PIL-based DESs not only have fast absorption rate, but also exhibit exceptional NH3 capacity and excellent recyclability. The highest mass capacity of 211 mg NH3/g DES was achieved by [Im][NO3]/EG with molar ratio of 1:3, and was higher than all the reported ILs and IL-based DESs, which was originated from multiple hydrogen bonding between acidic H and hydroxyl groups of the DESs and NH3. This work will provide useful idea for designing IL-based solvents for NH3 separation applications. |
| Keywords: | deep eutectic solvents hydrogen bonding multiple NH3 absorption protic ionic liquids |