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| Research of Inhibiting Lignin Condensation by Ethylene Glycol During DES Pretreatment Process |
| Received:August 29, 2022 |
| DOI：10.11981/j.issn.1000-6842.2022.04.39 |
| Key Words:deep eutectic solvent;condensation inhibition;lignin fractionation;lignin |
| Fund Project:国家自然科学基金面上项目（22278046，22078035）。 |
| Author Name | Affiliation | Postcode | | LI Xinke* | School of Light Industry and Chemical Engineering， Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials，Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery， Dalian Polytechnic University，Dalian， Liaoning Province， 116034 | 116034 | | ZHAO Xin | School of Light Industry and Chemical Engineering， Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials，Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery， Dalian Polytechnic University，Dalian， Liaoning Province， 116034 | 116034 | | ZHU Hongwei | Yueyang Forest and Paper Company Limited， Yueyang， Hu'nan Province， 414002 | 414002 | | WANG Xing | School of Light Industry and Chemical Engineering， Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials，Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery， Dalian Polytechnic University，Dalian， Liaoning Province， 116034 | 116034 | | ZHOU Jinghui | School of Light Industry and Chemical Engineering， Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials，Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery， Dalian Polytechnic University，Dalian， Liaoning Province， 116034 | 116034 |
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| Abstract: |
| Lignin was fractionated from bamboo powder with different deep eutectic solvent （DES） systems， i.e.， the binary choline chloride/oxalic acid and the ternary choline chloride/ethylene glycol/oxalic acid， and the changes in lignin structure were investigated by various characterization methods. The results showed that the relative β-O-4 aryl ether bond content of binary DES lignin was merely 0.26/Ar and that of the ternary DES lignin was 0.43/Ar at the same processing condition of 110 ℃ for 180 min. Meanwhile， the condensed structure （β-β， β-5=3.11/Ar） and condensed aromatic C—C bond （Aromatic C—C=2.18/Ar） of binary DES lignin were more than those of ternary DES lignin （β-β， β-5=2.02/Ar， Aromatic C—C=1.99/Ar）. The lignin removal rate reached 76.0% after 20 min of reaction with ultrasound-assisted ternary DES pretreatment. The contents of phenolic hydroxyl and carboxyl groups of ternary DES lignin under different reaction conditions were determined by aqueous potentiometric titration. The mechanism of ethylene glycol inhibiting lignin condensation during the pretreatment of bamboo powder with ternary DES system was put forward， and the reaction of ethylene glycol with p-coumaric acid and ferulic acid was proved to produce esterified lignin structure. |
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