TY - JOUR
T1 - Recent advances in the application of alcohols in extracting lignin with preserved β-O-4 content from lignocellulosic biomass
AU - Yong, Khai Jie
AU - Wu, Ta Yeong
N1 - Funding Information:
This work was supported by the Ministry of Higher Education, Malaysia, under the Fundamental Research Grant Scheme (FRGS/1/2019/WAB01/MUSM/02/1). The authors would also like to acknowledge Monash University Malaysia for providing a Ph.D. scholarship to K.J. Yong.
Publisher Copyright:
© 2023 The Author(s)
PY - 2023/9
Y1 - 2023/9
N2 - Utilizing lignocellulosic biomass wastes to produce bioproducts is essential to address the reliance on depleting fossil fuels. However, lignin is often treated as a low-value-added component in lignocellulosic wastes. Valorization of lignin into value-added products is crucial to improve the economic competitiveness of lignocellulosic biorefinery. Monomers obtained from lignin depolymerization could be upgraded into fuel-related products. However, lignins obtained from conventional methods are low in β-O-4 content and, therefore, unsuitable for monomer production. Recent literature has demonstrated that lignins extracted with alcohol-based solvents exhibit preserved structures with high β-O-4 content. This review discusses the recent advances in utilizing alcohols to extract β-O-4-rich lignin, where discussion based on different alcohol groups is considered. Emerging strategies in employing alcohols for β-O-4-rich lignin extraction, including alcohol-based deep eutectic solvent, flow-through fractionation, and microwave-assisted fractionation, are reviewed. Finally, strategies for recycling or utilizing the spent alcohol solvents are also discussed.
AB - Utilizing lignocellulosic biomass wastes to produce bioproducts is essential to address the reliance on depleting fossil fuels. However, lignin is often treated as a low-value-added component in lignocellulosic wastes. Valorization of lignin into value-added products is crucial to improve the economic competitiveness of lignocellulosic biorefinery. Monomers obtained from lignin depolymerization could be upgraded into fuel-related products. However, lignins obtained from conventional methods are low in β-O-4 content and, therefore, unsuitable for monomer production. Recent literature has demonstrated that lignins extracted with alcohol-based solvents exhibit preserved structures with high β-O-4 content. This review discusses the recent advances in utilizing alcohols to extract β-O-4-rich lignin, where discussion based on different alcohol groups is considered. Emerging strategies in employing alcohols for β-O-4-rich lignin extraction, including alcohol-based deep eutectic solvent, flow-through fractionation, and microwave-assisted fractionation, are reviewed. Finally, strategies for recycling or utilizing the spent alcohol solvents are also discussed.
KW - Bioenergy
KW - Biomass pretreatment
KW - Biomass valorization
KW - Biorefinery
KW - Delignification
KW - Waste management
KW - Wood technology
UR - http://www.scopus.com/inward/record.url?scp=85162138887&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2023.129238
DO - 10.1016/j.biortech.2023.129238
M3 - Review Article
C2 - 37245662
AN - SCOPUS:85162138887
SN - 0960-8524
VL - 384
JO - Bioresource Technology
JF - Bioresource Technology
M1 - 129238
ER -
