Journal
BIORESOURCE TECHNOLOGY
Volume 214, Issue -, Pages 496-503Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2016.04.135
Keywords
Cellulose hydrolysis; Hydrothermal process; Lignocellulosic waste; Multi-level dissolution; Semi-flow reaction system
Funding
- National Natural Science Foundation of China [51578071, 51208039]
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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. (C) 2016 Elsevier Ltd. All rights reserved.
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