Multi-level dissolution and hydrolysis of lignocellulosic waste with a semi-flow hydrothermal system
Multi-level dissolution and hydrolysis of lignocellulosic waste with a semi-flow hydrothermal system
复制标题
半流水热系统对木质纤维素废物进行多级溶解和水解
DOI：
10.1016/j.biortech.2016.04.135
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发表时间：
2016
影响因子：
11.4
通讯作者：
Lei Zou
中科院分区：
文献类型：
--
作者：
Yan Zhao;Haobo Tan;Yingjie Xu;Lei Zou
水热工艺能有效地转化木质纤维，有利于潜在的生物乙醇生产。在间歇式和流程式过程中，木质纤维素的同时溶解和水解会导致产物损失和抑制中间体。因此，利用半流动系统实现了玉米秸秆的多级水热转化，为不溶化合物提供不同的停留时间，并在各自的最佳条件下促进溶解或水解。在195~200℃的温度下，无定形半纤维素和木质素在第一阶段溶解，木聚糖、酸溶木质素和部分Klason木质素溶解，不影响葡聚糖。在第二阶段溶解中，未溶解物质的结晶度在245-250℃时突然下降，纤维素的溶解比率高于75%。在280℃的温度下，溶解的纤维素被水解，得到了可溶的糖。这一结果为多级水热过程及其在从木质纤维废料中回收有价值的化学品的潜在应用提供了重要的信息。
The hydrothermal process is efficient in lignocellulosic conversion and is beneficial to potential bioethanol production. In batch- and flow-type processes, concurrent dissolution and hydrolysis of lignocellulose result in product loss and inhibitory intermediates. Therefore, multi-level hydrothermal conversion of corn stalks was implemented with a semi-flow system to provide different residence times to undissolved compounds and facilitate dissolution or hydrolysis at respective optimal conditions. First-stage dissolution dissolved amorphous hemicellulose and lignin at 195–200 °C. Xylan, acid soluble lignin, and part of Klason lignin were dissolved without affecting glucan. In second-stage dissolution, the crystallinity of the undissolved materials suddenly decreased at 245–250 °C. The cellulose dissolution ratio was higher than 75%. Soluble sugars were obtained after the hydrolysis of dissolved cellulose at 280 °C. The results provide significant information on the multi-level hydrothermal process and its potential applications for recovering valuable chemicals from lignocellulosic waste.