Ionic liquid pretreatment of lignocellulosic biomass with ionic liquid–water mixtures
Abstract
Ground lignocellulosic biomass (Miscanthus giganteus, pine (Pinus sylvestris) and willow (Salix viminalis)) was pretreated with ionic liquid–water mixtures of 1-butyl-3-methylimidazolium methyl sulfate and 1-butyl-3-methylimidazolium hydrogen sulfate. A solid fraction enriched in cellulose was recovered, which was subjected to enzymatic hydrolysis. Up to 90% of the glucose and 25% of the hemicellulose contained in the original biomass were released by the combined ionic liquid pretreatment and the enzymatic hydrolysis. After the pretreatment, the ionic liquid liquor contained the majority of the lignin and the hemicellulose. The lignin portion was partially precipitated from the liquor upon dilution with water. The amount of hemicellulose monomers in the ionic liquid liquor and their conversion into furfurals was also examined. The performance of ionic liquid–water mixtures containing 1,3-dialkylimidazolium ionic liquids with acetate, methanesulfonate, trifluoromethanesulfonate and chloride anions was investigated. The applicability of the ionic liquid 1-butylimidazolium hydrogensulfate for lignocellulose pretreatment was also examined. It was found that ionic liquid liquors containing methyl sulfate, hydrogen sulfate and methanesulfonate anions were most effective in terms of lignin/cellulose fractionation and enhancement of cellulose digestibility.
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A protic cation prevents cellulose solubilisation entirely in many cases.
“A protic cation prevents cellulose solubilisation entirely in many cases.57,91”
From Deconstruction of lignocellulosic biomass with ionic liquids (2013) · cites this paper as [57]
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Deconstruction of lignocellulosic biomass with ionic liquids
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- Authors
- Brandt, A., Ray, M. J., To, T. Q., Leak, D. J., Murphy, R. J., & Welton, T.
- Affiliations
- Imperial College London (GB)
- Corresponding author
- Welton, Tom
- Venue
- Green Chemistry
- Publisher
- Royal Society of Chemistry (RSC)
- Published
- 2011
- Volume
- 13
- Issue
- 9
- Pages
- 2489
- ISSN
- 1463-9262 (ISSN-L)
- 1463-9270
- OpenAlex
- W2144258722
- Cited by
- 491
- References
- 35
- Citations by year
- 2026: 15 · 2025: 26 · 2024: 17 · 2023: 23 · 2022: 41 · 2021: 46 · 2020: 35 · 2019: 46 · 2018: 43 · 2017: 36 · 2016: 34 · 2015: 44 · 2014: 36 · 2013: 29 · 2012: 19
- FWCI
- 16.09
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Green Chemistry (publishedVersion)
- Surrey Research Insight Open Access (The University of Surrey) (submittedVersion)
- Spiral (Imperial College London) (submittedVersion)
- Topics
- Physical Sciences › Engineering › Biomedical Engineering › Biofuel production and bioconversion
- Physical Sciences › Chemical Engineering › Catalysis › Ionic liquids properties and applications
- Physical Sciences › Engineering › Biomedical Engineering › Catalysis for Biomass Conversion
- Keywords
- ionic liquid pretreatment, lignocellulosic biomass, Miscanthus × giganteus, Pinus sylvestris, Salix viminalis, 1-butyl-3-methylimidazolium hydrogen sulfate, ionic liquid-water mixtures, enzymatic hydrolysis, cellulose digestibility, lignin fractionation, hemicellulose, furfural formation, anion effects, lignocellulose conversion
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