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Highly efficient and selectivefractionation strategy for lignocellulosic biomass with recyclable dioxane/ethylene glycol binary solvent

Yongjia Zhang,Junfeng Feng,Z. Xiao,Yingming Liu,Haoyang Ma,Zining Wang,H. Pan

Published 2020 in Industrial Crops and Products

ABSTRACT

Abstract Poplar is among the short-rotation and dedicated energy crops which serve as lignocellulosic feedstock for future bio-refinery. In this study, a promising bio-refinery strategy was developed to efficiently fractionate poplar wood into its three components with dioxane/ethylene glycol as reaction medium and H2SO4 as catalyst under microwave irradiation. Up to 94.5% lignin and 95.1% hemicellulose can be selectively separated from raw poplar while achieve 78.5% cellulose retention at 120 °C with 1.5wt% H2SO4 for 10min. The characterization of recovered lignin implied that it has relatively low molecular weight as well as less condensed structures, which enable its easy dissolving in common solvents and facilitate its further applications. In addition, pure cellulose comparable to commercial α-cellulose can be obtained by slightly increasing fractionation time and temperature. The high quality fractions, easy-handle operation process and the possible solvent recovery entitle the proposed fractionation approach have great potential to scale up for industrial implementation.

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