期刊
JOURNAL OF MOLECULAR LIQUIDS
卷 340, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.molliq.2021.117228
关键词
SO2 absorption; Deep eutectic solvents; Phosphonium-based; Flue gas; Low viscosity
资金
- Education Department Excellent Talents Training Program of Liaoning Province [2020LNQN21]
- Excellent Talents Training Program of University of Science and Technology Liaoning [2019RC12]
- Liaoning high-level innovation team overseas training project [2018LNGXGJWPY-YB010]
- Key R&D Funding Scheme of Liaoning Province [2017308008]
In this study, four low-viscosity deep eutectic solvents (DES) were synthesized with different substituents and their effectiveness in low-concentration SO2 absorption was systematically investigated. The experimental results demonstrated that EG-MTPB DES exhibited higher SO2 absorption capacity and lower viscosity, making it suitable for industrial flue gas desulfurization applications.
Four hydrogen bond acceptors (HBAs) with different carbon chain length substituents, including methyltriphenyl phosphonium bromide (MTPB), ethyl-triphenyl phosphonium bromide (ETPB), propyltriphenyl phosphonium bromide (PTPB), and butyl-triphenyl phosphonium bromide (BTPB), combined with ethylene glycol (EG) were developed to synthesize four low-viscosity deep eutectic solvents (DESs). In this study, the effect of different substituents in DESs on low-concentration SO 2 absorption was systematically studied at 30-70 degrees C. Experimental results show that the EG-MTPB DES has a higher SO2 absorption capacity and a lower viscosity than other DESs. The reason for the higher SO2 absorption capacity of EG-MTPB DES was described by viscosity experiments and quantum chemical calculations. It was shown that the strong polarization ability of the CH3- group promotes the absorption of SO2 by DESs. H-1 NMR and FTIR results indicated that chemical interactions primarily exist between the S of SO2 and Br, and the O of SO2 and the H atom of EG form hydrogen bonds. The density functional theory (DFT) results also confirm that the charge of the Br atom migrated to the S atom. Also, thermostability and regeneration experiments showed that the EG-MTPB DES exhibits good stability and can thus be used for industrial flue gas desulfurization. (C) 2021 Elsevier B.V. All rights reserved.
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