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Study on extraction of lignin and synthesis of lignin-based epoxy resins using ionic liquid

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Abstract

Lignin molecules contain alcohol hydroxyl and phenolic hydroxyl, so lignin can be used instead of toxic bisphenol A (BPA) to synthesize epoxy resin, which can not only reduce the amount of formaldehyde emission but also achieve the purpose of waste utilization and environmental protection. In this study, the lignin of Eucalyptus urophylla was extracted with ionic liquid as the extraction agent, and subsequently phenolated by methylphenol as phenolic agent with concentrated sulfuric acid as catalyst to prepare phenolated lignin (PLG). Then, using NaOH as catalyst, the PLG was epoxidized with epoxy chloropropane (ECH) to synthesize the lignin-based epoxy resin (LGEP). The extraction of lignin and the synthesis of LGEP were investigated by the single-factor and orthogonal test, and the Eucalyptus urophylla raw materials, lignin, PLG, and LGEP were characterized by UV, FTIR, XRD, SEM, and TGA. The results demonstrated that when the ionic liquid was [ChCl][Gly], the temperature was 90 °C, the time was 4 h, and the liquid-solid ratio was 20:1; the extraction rate of lignin reached 93.73%, and the purity of the regenerated lignin was 96.3%. The mass ratio of PLG to ECH was 1:2.5, the mass fraction of NaOH was 20% of the mass of PLG, the reaction time was 3 h, and the reaction temperature was 95 °C. Under this condition, the epoxy value of LGEP was 0.364.

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Funding

This work was supported by the financial funds received from the Guangdong science project (2015B020241002), National Key R&D Program(2017YFD0601003), and National Natural Science Foundation of China (NSFC) (21506217).

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Authors and Affiliations

  1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640, China

    Changlin Miao, Zhuang Xinshu, Lingmei Yang, Huiwen Li, Pengmei Lv & Wen Luo

  2. Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou, 510640, China

    Changlin Miao, Zhuang Xinshu, Lingmei Yang, Huiwen Li, Pengmei Lv & Wen Luo

  3. Guangdong Key Laboratory of New and Renewable Energy Research and Development, Guangzhou, 510640, China

    Changlin Miao, Zhuang Xinshu, Lingmei Yang, Huiwen Li, Pengmei Lv & Wen Luo

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  1. Changlin Miao
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  2. Zhuang Xinshu
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  4. Huiwen Li
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Correspondence to Huiwen Li.

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Miao, C., Xinshu, Z., Yang, L. et al. Study on extraction of lignin and synthesis of lignin-based epoxy resins using ionic liquid. Biomass Conv. Bioref. 13, 1115–1126 (2023). https://doi.org/10.1007/s13399-021-01295-2

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  • DOI: https://doi.org/10.1007/s13399-021-01295-2

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