Abstract
Cooking with active oxygen and solid alkali (CAOSA) is a mild and environmentally friendly method for separation of lignin components. The degradation mechanism of hemicellulose associated with this method has been investigated. It was found that the hemicellulose-derived polysaccharides were directly oxidized rather than hydrolyzed to monosaccharides for degradation. To avoid the undesirable degradation of hemicellulose components by CAOSA, the idea of separating hemicellulose first in the form of xylan to produce xylooligosaccharide was presented by this study. Although hydrothermal autocatalysis has been commonly used in hemicellulose separation, the effects of acid-enhanced hydrothermal method and alkali-suppressed hydrothermal method on hydrothermal autocatalysis were systematically compared for the first time, and it was found that the acid-enhanced method was beneficial for highly selective extraction of xylan. Then, the hemicellulose-removed bamboo was treated with CAOSA process to separate lignin from cellulose. It was found that solid alkali dosage of CAOSA could be evidently decreased for hemicellulose-removed bamboo, which was helpful to reduce the cost of CAOSA. Coupling hemicellulose pre-extraction and CAOSA lignin fractionation strategy, a comprehensive biorefinery case for bamboo biomass could be anticipated.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (21908075), the Natural Science Foundation of Jiangsu Province of China (BK20191056, BK20190105), the Natural Science Foundation of the Higher Education Institutions of Jiangsu Province (19KJB220006), the Natural Science Foundation of Huai’an City (HAB202057), the Open Project of Jiangsu Engineering Laboratory for Environmental Functional Materials (JSEFM201809), the Natural Science Fund for Colleges and Universities in Jiangsu Province (20KJA416004), and the College Students’ Innovative Entrepreneurial Training Plan Program (201918006XJ, 201918007XJ, 202010323081H).
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Jiang, Y., Wang, X., Wu, Z. et al. Integration of hemicellulose pre-extraction and solid alkali-oxygen cooking processes for lignocellulose fractionation with emphasis on xylan valorization. Korean J. Chem. Eng. 38, 788–796 (2021). https://doi.org/10.1007/s11814-020-0720-1
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DOI: https://doi.org/10.1007/s11814-020-0720-1