Chemical Industry and Engineering Progress ›› 2023, Vol. 42 ›› Issue (9): 4974-4983.DOI: 10.16085/j.issn.1000-6613.2022-1955

• Resources and environmental engineering • Previous Articles     Next Articles

Pretreatment of wheat straw with acidic molten salt hydrate for xylose production and its effect on enzymatic hydrolysis efficiency

LI You(), WU Yue, ZHONG Yu, LIN Qixuan, REN Junli()   

  1. State Key Laboratory of Pulp and Paper Engineering, School of Light Industry and Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2022-10-19 Revised:2022-12-20 Online:2023-09-28 Published:2023-09-15
  • Contact: REN Junli

酸性熔盐水合物预处理麦秆高效制备木糖及其对酶解效率的影响

李由(), 吴越, 钟禹, 林琦璇, 任俊莉()   

  1. 华南理工大学轻工科学与工程学院制浆造纸工程国家重点实验室,广东 广州 510640
  • 通讯作者: 任俊莉
  • 作者简介:李由(1999—),男,硕士研究生,研究方向为生物质预处理。E-mail:202120129546@mail.scut.edu.cn
  • 基金资助:
    国家重点研发计划(2021YFC2101601);国家自然科学基金面上项目(21978104)

Abstract:

Straw pretreatment is used to improve component fractionation as well as enzymatic efficiency. In this study, we proposed a green, mild and recyclable pretreatment method of acidic molten salt hydrate for agricultural straw, which could achieve selective hemicellulose fractionation and target depolymerization of hemicellulose to xylose while maintaining a high retention of cellulose. The optimal pretreatment conditions were 97℃, 19.0min and 3.3% sulfuric acid concentration, under this condition the xylose yield was 90.85% and the cellulose retention was 85.87%. After enzymatic hydrolysis of the pretreated residue for 72h, the glucose enzymatic yield was up to 77.81%. In addition, the recycling of ZnCl2 in this system was also studied. After five cycles of recycling, the pretreatment xylose yield reached 87.69% with maintaining a high recovery of ZnCl2 solids (80%), which was indicative of a good pretreatment effect.

Key words: straw, molten salt hydrate, pretreatment, xylose, enzyme hydrolysis

摘要:

秸秆预处理的目的是提高组分拆解以及酶解效率。本研究提出一种绿色温和、可循环使用的酸性熔盐水合物预处理农业秸秆的方法,能实现小麦秸秆中半纤维素的选择性拆解并定向解聚为木糖,同时保持较高的纤维素保留率。预处理体系以氯化锌熔盐水合物为溶剂协同酸作催化剂,研究了反应温度、反应时间与硫酸浓度对组分拆解效率的影响,最优反应条件为:温度97℃,时间19.0min,硫酸质量分数3.3%。在此条件下木糖得率达到90.85%,纤维素保留率为85.87%。将预处理后残渣经过酶水解72h后,葡萄糖酶解得率最高可达77.81%。此外,还研究了该体系中氯化锌的循环利用情况,5次循环利用后,在保持氯化锌固体较高回收率的情况下(质量分数为80%),预处理木糖得率达87.69%,依然表现出良好的预处理效果。

关键词: 麦秆, 熔盐水合物, 预处理, 木糖, 酶水解

CLC Number: 

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