Extraction of lignin from lignocellulose at atmospheric pressure using alkylbenzenesulfonate ionic liquid
Abstract
Lignocellulosic materials are a potentially valuable source of both aromatic compoundsvia the lignin component and sugars from the cellulose and hemicellulose components. However, efficient means of separating and depolymerising the components are required. An ionic liquid mixture containing the 1-ethyl-3-methylimidazolium cation and a mixture of alkylbenzenesulfonates with xylenesulfonate as the main anion was used to extract lignin from sugarcane plant waste at atmospheric pressure and elevated temperatures (170–190 °C). The lignin was recovered from the ionic liquid by precipitation, allowing the ionic liquid to be recycled. An extraction yield exceeding 93% was attained. The lignin produced had a molecular weight of 2220 g/mol after acetylation. The regenerated ionic liquid showed good retention of structure and properties. The other product of the extraction was a cellulose pulp, which can be used in further processing.
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Increased sulfur content of lignin after treatment with ionic liquids with sulfur containing anions such as sulfonates, sulfamates and sulfates has been reported.
“In support of this, an increased sulfur content of the lignin after treatment with ionic liquids with sulfur containing anions such as sulfonates and sulfamates (e.g.[ABS] -and acesulfamate) 52,53 and sulfates ([MeSO 4 ] -and [HSO 4 ] -) 55 has been reported.”
From Deconstruction of lignocellulosic biomass with ionic liquids (2013) · cites this paper as [55]
An increase of the water content in the system appears to lead to less delignification and lower subsequent saccharification yields.
“An increase of the water content in the system appears to lead to less delignification (and also to lower subsequent saccharification yields).55”
From Deconstruction of lignocellulosic biomass with ionic liquids (2013) · cites this paper as [55]
The less basic or sometimes even acidic environment of non-acetate ionic liquids can cause more hemicellulose conversion to furfurals and/or humins, which is not seen for the acetate ionic liquids.
“As a potential drawback, the less basic or sometimes even acidic environment of non-acetate ionic liquids can cause more hemicellulose conversion to furfurals and/or humins, which is not seen for the acetate ionic liquids.55”
From Deconstruction of lignocellulosic biomass with ionic liquids (2013) · cites this paper as [55]
Brandt et al. detected varying amounts of monomeric hemicellulose and furfurals in liquors of [C4C1im][MeSO4], [C4C1im][HSO4] and [C4C1im][MeSO3] after treatment of Miscanthus with fresh ionic liquid, the quantities detected depending on the ionic liquid acidity and the treatment length.
“Brandt et al. detected varying amounts of monomeric hemicellulose and furfurals in liquors of [C 4 C 1 im][MeSO 4 ], [C 4 C 1 im][HSO 4 ] and [C 4 C 1 im][MeSO 3 ] after treatment of Miscanthus with fresh ionic liquid, the quantities detected depending on the ionic liquid acidity and the treatment length.55”
From Deconstruction of lignocellulosic biomass with ionic liquids (2013) · cites this paper as [55]
Almost quantitative removal of lignin has been achieved with the Ionosolv Process.
“In spite of this, almost quantitative removal of lignin has been achieved.55”
From Deconstruction of lignocellulosic biomass with ionic liquids (2013) · cites this paper as [55]
Water can be added to the ionic liquid phase to precipitate the dissolved lignin for further processing or incineration.
“Water can be added to the ionic liquid phase to precipitate the dissolved lignin for further processing or incineration.52,53,55”
From Deconstruction of lignocellulosic biomass with ionic liquids (2013) · cites this paper as [55]
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- Authors
- Tan, S. S. Y., MacFarlane, D. R., Upfal, J., Edye, L. A., Doherty, W. O. S., Patti, A. F., Pringle, J. M., & Scott, J. L.
- Affiliations
- Queensland University of Technology (AU)
- Monash University (AU)
- Corresponding author
- Tan, Suzie S. Y.
- ORCID
- Venue
- Green Chemistry
- Publisher
- Royal Society of Chemistry (RSC)
- Published
- 2009
- Volume
- 11
- Issue
- 3
- Pages
- 339
- ISSN
- 1463-9262 (ISSN-L)
- 1463-9270
- OpenAlex
- W1605337378
- Cited by
- 429
- References
- 26
- Citations by year
- 2026: 2 · 2025: 9 · 2024: 8 · 2023: 18 · 2022: 12 · 2021: 21 · 2020: 38 · 2019: 30 · 2018: 23 · 2017: 35 · 2016: 32 · 2015: 31 · 2014: 36 · 2013: 34 · 2012: 40
- FWCI
- 20.03
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Green Chemistry (publishedVersion)
- Funders
- Sugar Research and Development Corporation
- Monash University
- Topics
- Physical Sciences › Engineering › Biomedical Engineering › Lignin and Wood Chemistry
- Physical Sciences › Chemical Engineering › Catalysis › Ionic liquids properties and applications
- Physical Sciences › Engineering › Biomedical Engineering › Biofuel production and bioconversion
- Keywords
- lignin extraction, lignocellulosic biomass, 1-ethyl-3-methylimidazolium, ionic liquid recycling, lignin depolymerization, cellulose pulp, biomass valorization
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