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Article

Exploring the Effect of Water Content and Anion on the Pretreatment of Poplar with Three 1-Ethyl-3-methylimidazolium Ionic Liquids

1
Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK
2
Department of Chemistry, Imperial College London, London W12 0BZ, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Rafał Łukasik
Molecules 2020, 25(10), 2318; https://doi.org/10.3390/molecules25102318
Received: 19 April 2020 / Revised: 9 May 2020 / Accepted: 12 May 2020 / Published: 15 May 2020
(This article belongs to the Special Issue Lignocellulosic Biomass to Biofuels and Biochemicals)
We report on the pretreatment of poplar wood with three different 1-ethyl-3-methylimidazolium ionic liquids, [EMim][OAc], [EMim][MeSO3], and [EMim][HSO4], at varying water contents from 0–40 wt% at 100 °C. The performance was evaluated by observing the lignin and hemicellulose removal, as well as enzymatic saccharification and lignin yield. The mechanism of pretreatment varied between the ionic liquids studied, with the hydrogen sulfate ionic liquid performing delignification and hemicellulose hydrolysis more effectively than the other solvents across the investigated water content range. The acetate ionic liquid produced superior glucose yield at low water contents, while the hydrogen sulfate ionic liquid performed better at higher water contents and produced a recoverable lignin. The methanesulfonate ionic liquid did not introduce significant fractionation or enhancement of saccharification yield under the conditions used. These findings help distinguish the roles of anion hydrogen bonding, solvent acidity, and water content on ionic liquid pretreatment and can aid with anion and water content selections for different applications. View Full-Text
Keywords: ionic liquids; lignocellulose pretreatment; biorefining; enzymatic saccharification; compositional analysis; poplar ionic liquids; lignocellulose pretreatment; biorefining; enzymatic saccharification; compositional analysis; poplar
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MDPI and ACS Style

Gschwend, F.J.V.; Hallett, J.P.; Brandt-Talbot, A. Exploring the Effect of Water Content and Anion on the Pretreatment of Poplar with Three 1-Ethyl-3-methylimidazolium Ionic Liquids. Molecules 2020, 25, 2318. https://doi.org/10.3390/molecules25102318

AMA Style

Gschwend FJV, Hallett JP, Brandt-Talbot A. Exploring the Effect of Water Content and Anion on the Pretreatment of Poplar with Three 1-Ethyl-3-methylimidazolium Ionic Liquids. Molecules. 2020; 25(10):2318. https://doi.org/10.3390/molecules25102318

Chicago/Turabian Style

Gschwend, Florence J.V., Jason P. Hallett, and Agnieszka Brandt-Talbot. 2020. "Exploring the Effect of Water Content and Anion on the Pretreatment of Poplar with Three 1-Ethyl-3-methylimidazolium Ionic Liquids" Molecules 25, no. 10: 2318. https://doi.org/10.3390/molecules25102318

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