Abstract
Using wet-storage pretreatment coupled with oxygen-alkali cooking technique can achieve the high efficiency, energy-saving and clean extraction of bagasse fibers. Based on this view, the delignification and carbohydrate degradation behaviors of wet-storage bagasse under different pulping conditions (cooking time, alkali charge, MgSO4 dosage, and initial pressure of oxygen) were investigated in detail. The results showed that the bagasse could form pulp after wet-storage pretreatment at a lower temperature (90 °C) and lower alkali charge (24%). In addition, the kinetic models of oxygen delignification and two-step degradation of carbohydrate (bulk fiber to individual fiber bundles, and then to degradable cellulose) were established to control the process of oxygen-alkali pulping. The activation energy for oxygen delignification and two-step degradation of carbohydrates was 31.45, 33.17 and 28.07 kJ/mol, respectively, indicating that the screened pulp fibers were more susceptible to degradation during oxygen delignification for bagasse after wet-storage. Therefore, the cooking end-point needs to be accurately controlled to reduce the significant degradation of carbohydrates in the later stage of cooking for oxygen alkali pulping of bagasse after wet-storage pretreatment.
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The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Acknowledgments
This work is supported by the National Natural Science Foundation of China (Grant No. 21968014, 22008097), the National Key Research and Development Program of China (Grant No. 2019YFC1805904), the Scientific Research Fund of Yunnan Provincial Department of Education (Grant No. 2021J0051) and the Analysis and Testing Foundation of Kunming University of Science and Technology (No. 2019T20170031).
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Li, J., Miao, G., He, L. et al. Analyzing the delignification, carbohydrate degradation kinetics, and mechanism of wet-storage bagasse in oxygen-alkali cooking. Cellulose 29, 9421–9435 (2022). https://doi.org/10.1007/s10570-022-04843-9
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DOI: https://doi.org/10.1007/s10570-022-04843-9