Abstract
This study proposed a recyclable p-toluenesulfonic acid (p-TsOH) fractionation process for co-producing lignin nanoparticles (LNPs) and fermentable sugars from lignocellulosic biorefinery biowaste (enzymatic hydrolysis residue (EHR)). The prepared LNPs were used to detoxify the inhibitors in the xylose-rich prehydrolyzate for improving ethanol production. Results showed that the EHR was fractionated into a cellulose-rich water-insoluble solid (WIS) fraction and a lignin-rich spent liquor (SL) fraction. Cellulase hydrolysis of WIS produced 97.7% of glucose yield, while the LNPs of an average particle size of 98.0 nm with 76.3 % yield (based on the untreated EHR) were obtained from the diluted SL. LNPs demonstrated higher detoxification ability than EHR at the same dosage. Moreover, the fermentability of the detoxified xylose-rich prehydrolyzate was significantly improved. The sugar utilization ratio was 94.8%, and the ethanol yield reached its peak value of 85.4% after 36 h of fermenting the detoxified xylose-rich prehydrolyzate.
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Acknowledgements
The research was supported by the National Key Research and Development Program of China (2017YFD0601001) and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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The National Key Research and Development Program of China, 2017YFD0601001.
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Zhu, J., Jiao, N., Zhang, H. et al. Detoxification of lignocellulosic prehydrolyzate by lignin nanoparticles prepared from biorefinery biowaste to improve the ethanol production. Bioprocess Biosyst Eng 45, 1011–1018 (2022). https://doi.org/10.1007/s00449-022-02720-0
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DOI: https://doi.org/10.1007/s00449-022-02720-0