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

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

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.

Suggested Citation

  • Wen, Peiyao & Chu, Jie & Zhu, Junjun & Xu, Yong & Zhang, Junhua, 2022. "Highly selective delignification of poplar by hydrogen peroxide-ethyl acetate pretreatment at room temperature," Renewable Energy, Elsevier, vol. 188(C), pages 1022-1028.
    • Handle: RePEc:eee:renene:v:188:y:2022:i:c:p:1022-1028
    DOI: 10.1016/j.renene.2022.02.094
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    References listed on IDEAS

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    1. Song, Younho & Cho, Eun Jin & Park, Chan Song & Oh, Chi Hoon & Park, Bok-Jae & Bae, Hyeun-Jong, 2019. "A strategy for sequential fermentation by Saccharomyces cerevisiae and Pichia stipitis in bioethanol production from hardwoods," Renewable Energy, Elsevier, vol. 139(C), pages 1281-1289.
    2. Larnaudie, Valeria & Ferrari, Mario Daniel & Lareo, Claudia, 2021. "Life cycle assessment of ethanol produced in a biorefinery from liquid hot water pretreated switchgrass," Renewable Energy, Elsevier, vol. 176(C), pages 606-616.
    3. Wen, Peiyao & Xu, Yong & Zhang, Junhua, 2021. "Alkaline incubation improves the saccharification of poplar after sodium chlorite pretreatment with ultra-low cellulase loading," Renewable Energy, Elsevier, vol. 170(C), pages 517-524.
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    Cited by:

    1. Fan, Meishan & Li, Jun & Liu, Zhu & Li, Caiqun & Zhang, Hongdan & Xie, Jun & Chen, Yong, 2023. "Evaluating performance of CrCl3-catalyzed ethanol pretreatment of poplar on cellulose conversion," Renewable Energy, Elsevier, vol. 216(C).

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