Effect of ［BMIM］HSO4 on physicochemical structure and thermal behavior of regenerated lignin

doi:10.3969/j.issn.1000-1565.2024.03.007

Abstract

Abstract: The effect of ionic liquid dissolution treatment on the thermal behavior of regenerated lignin was investigated. Taken regenerated lignin pretreated by 1-butyl-3-methylimidazole hydrogen sulfate(［BMIM］HSO₄)as the research object, the structure and composition of regenerated lignin were characterized by elemental analysis, XRD, FTIR, SEM. The thermal weight loss process of regenerated lignin was analyzed using a thermogravimetric analyzer and a distributed activation energy model. The effects of dissolution temperature and time on the structure and thermal weight loss process of ［BMIM］HSO₄ regenerated lignin were investigated. The results showed that the arrangement of lignin molecules is effectively adjusted during the lignin regeneration process, due to the occupying effect of ［BMIM］HSO₄. Compared with lignin raw materials, the thermal behavior of ［BMIM］HSO₄ regenerated lignin all shift towards the high-temperature range. Based on the calculation and analysis of the distributed activation energy model, the activation energy during the thermal weight loss process of regenerated lignin is higher than that of lignin raw materials. After the dissolution treatment of ［BMIM］HSO₄, the thermal stability of lignin is improved. The theoretical reference is provided for the development of lignin resource utilization technology.

Key words: lignin, 1-butyl-3-methylimidazole hydrogen sulfate, thermal behavior, physicochemical structure

CLC Number:

YANG Huamei, CHEN Ziqin, LUO Kai, WANG Beilei, YU Mengjun. Effect of ［BMIM］HSO₄ on physicochemical structure and thermal behavior of regenerated lignin[J]. Journal of Hebei University(Natural Science Edition), 2024, 44(3): 281-289.

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Effect of ［BMIM］HSO₄ on physicochemical structure and thermal behavior of regenerated lignin

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