Cascade temperature-arising strategy for xylo-oligosaccharide production from lignocellulosic biomass with acetic acid catalyst recycling operation

Jianming Guo, Yuanjie Gu, Xin Zhou, Bin Xu, Huan Wang and Yong Xu

Renewable Energy, 2021, vol. 175, issue C, 625-637

Abstract: Acetic acid acidolysis had so far been performed as a green technology to produce high value-added xylo-oligosaccharide from lignocellulosic residues while around 30% inert xylan-constitute is still retained. For improving economic and environmental benefits, a cascade temperature-arising technical strategy was designed and developed for the co-production of xylo-oligosaccharide and enzymatic-hydrolyzed glucose by a continuous two-step acidolysis mode with the recyclable acetic acid catalyst. The combined process was optimized by uniform design experiments and temperature plays the key factor for xylo-oligosaccharide yield and xylose-chemicals degradation. We obtained respectively 63.41% and 61.44% xylo-oligosaccharide yield from corncob and wheat straw during continuous two-step acidolysis with acetic acid recycling operation at 140 °C and 190 °C, which increased by 52.03% and 76.55% than the one-step process. Meanwhile, the corresponding enzymatic hydrolysis yield was increased to 100% and 98.2%. In short, the two-step cascade temperature-rising acidolysis technology can maximize the utilization of hemicellulose and cellulose constitutes and fully explore the value-added utilization of lignocellulosic biomass. The cascade temperature-arising technical strategy does therefore demonstrate something for the more efficient and green utilization of lignocellulosic biomass.

Keywords: Xylo-oligosaccharide; Corncob; Wheat straw; Cascade temperature-arising technical strategy; Recyclable acetic acid catalyst (search for similar items in EconPapers)
Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:175:y:2021:i:c:p:625-637

DOI: 10.1016/j.renene.2021.05.066

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