Multi-level dissolution and hydrolysis of lignocellulosic waste with a semi-flow hydrothermal system

作者：Zhao, Yan^*; Tan, Haobo; Xu, Yingjie; Zou, Lei

来源：Bioresource Technology, 2016, 214: 496-503.

DOI：10.1016/j.biortech.2016.04.135

• Cellulose hydrolysis
• Hydrothermal process
• Lignocellulosic waste
• Multi-level dissolution
• Semi-flow reaction system

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 degrees 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 degrees C. The cellulose dissolution ratio was higher than 75%. Soluble sugars were obtained after the hydrolysis of dissolved cellulose at 280 degrees C. The results provide significant information on the multi-level hydrothermal process and its potential applications for recovering valuable chemicals from lignocellulosic waste.

• 出版日期2016-8
• 单位北京师范大学