Synthesis of functional dicationic ionic liquids for the treatment of lignocellulosic biomass

Mono-cationic ionic liquids (MILs) have been widely utilized for the treatment of lignocelluloses. However, the hydrophilic property of MILs increases the difficulty of isolating sugars and their reuse, which limits their industrial application. In the present study, a series of dicationic ionic liq...

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Bibliographic Details
Published in:RSC advances 2022-01, Vol.12 (6), p.363-3634
Main Authors: Zhang, Bi-Xian, Wang, Xue-Yang, Wang, Jia-Jun, Liu, Xiu-Lin, Gao, Yun-Fei, Hu, Xiao-Mei
Format: Article
Language:English
Subjects:
Biomass
Cations
Chemistry
Hydrophobicity
Industrial applications
Ionic liquids
Ions
Lignocellulose
Miscibility
Sugar
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Summary:Mono-cationic ionic liquids (MILs) have been widely utilized for the treatment of lignocelluloses. However, the hydrophilic property of MILs increases the difficulty of isolating sugars and their reuse, which limits their industrial application. In the present study, a series of dicationic ionic liquids (DILs) were synthesized with totally different di-cations and di-anions. An alternating miscibility of DILs with water was observed depending on the dealing temperature. The functional DILs exhibiting hydrophobic and acidic properties were investigated for the treatment of corn stalk. High yields of sugars were achieved as 27.8% and 31.6% with DIL3 and DIL4, respectively. Cellulosic materials were obtained as 74.3% and 77.8% with DIL1 and DIL2 and 61.2% and 65.7% with DIL3 and DIL4, respectively. Enzymatic reaction was successfully performed with cellulosic materials after the DIL treatment. DILs were recycled and reused with no significant reduction in sugar yields. Hydrophobic DILs are a potentially effective approach to enable the successful decomposition and degradation of lignocellulosic biomass. Mono-cationic ionic liquids (MILs) have been widely utilized for the treatment of lignocelluloses.
ISSN:2046-2069
2046-2069
DOI:10.1039/d1ra06276j