A Sequential Autohydrolysis-Ionic Liquid Fractionation Process for High Quality Lignin Production
In this study, we propose a complete biomass fractionation strategy where all three major biopolymers, namely cellulose, hemicellulose and lignin, are separated with higher efficiency and purity. Sequential treatment of hybrid poplar wood using autohydrolysis (160 °C, 60 min) and 1-ethyl-3-methylimidazolium acetate activation (60 °C, 3 h) resulted in significantly improved enzymatic saccharification and fractionated 85% cellulose and 67% hemicellulose. The resulting solid fraction contained 90 % (w/w) lignin, which was equal to 71% yield based on the original biomass composition. The proposed two-step pretreatment process improved lignin yield by 77% and 23% compared to single-stage ionic liquid activation or autohydrolysis, respectively. Structural characterization by 2D nuclear magnetic resonance spectroscopy and small-angle neutron scattering revealed that the isolated lignin sustained minimal modifications to inter-unit linkages, and exhibited high thermotolerance as well as unique functionality, thereby highlighting the benefits of this process for lignin fractionation.
|Work Title||A Sequential Autohydrolysis-Ionic Liquid Fractionation Process for High Quality Lignin Production|
|License||In Copyright (Rights Reserved)|
|Publication Date||February 4, 2021|
|Publisher Identifier (DOI)||
|Deposited||July 16, 2021|
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