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Microwave-assisted Choline Chloride/Lactic Acid Deep Eutectic Solvents Pulping to Produce Wood Fibers with High Degree of Polymerization
Received:April 03, 2024  
DOI：10.11980/j.issn.0254-508X.2024.09.011
Key Words:microwave  deep eutectic solvents  cellulose DP  mechanical properties
Fund Project:制浆造纸工程国家重点实验室（2023C05，2022C01）；国家自然科学基金项目 （U23A6005）；广东省基础与应用基础研究基金（2023B1515040013）。
Author NameAffiliationPostcode
HUANG Pan School of Chemistry and Chemical Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
YANG Dongjie School of Chemistry and Chemical Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
ZHOU Jie School of Chemistry and Chemical Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
LI Yujie State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640） （*E-mail： mszhqfang@scut.edu.cn 510640
FANG Zhiqiang* State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640） （*E-mail： mszhqfang@scut.edu.cn 510640
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Abstract:Wood fibers with high cellulose polymerization degree （DP） were prepared via microwave-assisted deep eutectic solvents pulping method using spruce wood chips as material and choline chloride/lactic acid as reaction liquid， and the effects of molar ratio of choline chloride to lactic acid， reaction temperature， reaction time， and water content on cellulose DP were investigated. The results showed that microwave heating shortened the time for delignification， which decreased the acid hydrolysis of cellulose in the acidic medium and maintained high cellulose DP of wood fiber. The as-prepared wood fibers had cellulose DP of 1 998 under conditions， which were molar ratio of choline chloride to lactic acid of 1∶11， reaction temperature of 140 ℃， reaction time of 45 min， water content of 3%， as well as zero-distance tensile strength of 261.9 N·m/g， and the paper made by these fibers also exhibited excellent tensile strength of 51.6 MPa and toughness of 2.0 MJ/m3.
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