Abstract
Lignin is the primary waste in pulp and paper industries. Its complex, large-molecule structure results in low reactivity, limiting its potential for high-value utilization. This paper introduces a novel method for rapid hydroxylation modification of lignin (M-EHL) that offers advantages in terms of processing temperature and time compared to conventional demethylation, hydroxy-methylation, and phenolation methods. Using single-factor and orthogonal experiments, the optimal reaction conditions were determined. The modified lignin was characterized using 1H-NMR, FTIR, GPC and potentiometric titration. The result shows that the reaction, with the molar ratio (boron acid and hydrogen peroxide) to lignin at 1:0.4, reacting for 1.5 h at 80 ℃ reaches the highest yields. The phenolic hydroxyl content increased from 3.2167 mmol/g to 17.95 mmol/g. FTIR analysis revealed little structural changes in lignin, except for an increase in hydroxyl absorption peaks, suggesting little side reactions. Compared to unmodified lignin, GPC result reveals that M-EHL exhibited increased molecular weight and narrower distribution.
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Acknowledgements
This work was supported by Basic Scientific Research Projects for Universities of Liaoning Education Department, No. LJKMZ20220883, Scientific research project of Liaoning Science and Technology Department, No. LJKQZ2021120, and the Natural Science Foundation of China, No. 22378036.
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Li, C., Zhang, Q., Shi, H., Wang, C. (2024). Rapid Hydroxylation Modification of Lignin Under H3BO3/H2O2 System. In: Song, H., Xu, M., Yang, L., Zhang, L., Yan, S. (eds) Innovative Technologies for Printing, Packaging and Digital Media. CACPP 2023. Lecture Notes in Electrical Engineering, vol 1144. Springer, Singapore. https://doi.org/10.1007/978-981-99-9955-2_58
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DOI: https://doi.org/10.1007/978-981-99-9955-2_58
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