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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 NameAffiliationPostcode
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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