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| Study on Structures and Ultraviolet Absorption Capacity of Fractionated Lignin |
| Received:June 29, 2021 |
| DOI：10.11980/j.issn.0254-508X.2021.12.004 |
| Key Words:lignin solvent extraction structure ultraviolet absorption |
| Fund Project:宜宾市林竹产业高新技术创新平台建设与示范（2019YFN0029）。 |
| Author Name | Affiliation | Postcode | | LIU Bangcui | State Key Lab of Pulp and Paper Engineering, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | LI Bingyun* | State Key Lab of Pulp and Paper Engineering, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | FU Shiyu | State Key Lab of Pulp and Paper Engineering, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | HE Guanghua | Sichuan Yibin Paper Industry Co., Ltd., Yibin, Sichuan Province, 644000 | 644000 |
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| Abstract:Bamboo kraft lignin （KL） was fractionated with three organic solvents （ethyl acetate， butanone and acetone） sequentially and the lignin and lignin residues were obtained and characterized. The results showed that the organic solvent fractionation could effectively separate lignin according to the relative molecular quality and improve the accuracy of the analysis of the relationship between chemical structures of different levels of lignin and UV absorption capacity. The fractionation with ethyl acetate significantly improved the homogeneity of lignin， separated carbohydrate polymers impurity， and increased the content of structures conducive to UV absorption capacity， so that the overall UV absorption capacity of lignin was significantly improved. |
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