Highly selective delignification of poplar by hydrogen peroxide-ethyl acetate pretreatment at room temperature

Peiyao Wen, Jie Chu, Junjun Zhu, Yong Xu and Junhua Zhang

Renewable Energy, 2022, vol. 188, issue C, 1022-1028

Abstract: Highly selective delignification of lignocellulose with green solvent at mild conditions is a challenge. Previously, hydrogen peroxide-acetic acid (HPAA) was used as a green solvent in pretreatment exhibits excellent selective delignification capacity at a low reaction temperature (<80 °C). However, the release of oxygen can increase the pressure of the hydrogen peroxide-acetic acid (HPAA) pretreatment system and the risk of explosion. To overcome this problem, a novel hydrogen peroxide-ethyl acetate (HPEA) pretreatment was developed to remove poplar lignin, aiming at improving the pretreatment safety and saccharification efficiency. After HPEA pretreatment at room temperature for three days, 97.2% of poplar lignin was removed and 92.1% of original carbohydrate was retained. The glucose and xylose yields of HPEA-pretreated poplar reached 90.6% and 81.5% by a cellulase loading of 5 FPU/g dry matter, respectively. Compared with HPAA pretreatment, HPEA pretreatment reduced more than 93% of pressure in pretreatment system and largely increased pretreatment safety. The results indicates that HPEA pretreatment exhibited stronger delignification capacity, high carbohydrate retention, high safety, and strong enhancement of digestibility of poplar. This work provides a safe pretreatment to selectively remove lignin at mild conditions for efficient saccharification of poplar.

Keywords: Hydrogen peroxide-ethyl acetate pretreatment; Hydrogen peroxide-acetic acid pretreatment; Poplar; Delignification; Enzymatic hydrolysis (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:188:y:2022:i:c:p:1022-1028

DOI: 10.1016/j.renene.2022.02.094

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