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Study on Improving the Components Separation Efficiency of Eucalyptus by Alkali Pretreatment Coupled with Ternary DES System
Received:October 30, 2023  
DOI：10.11980/j.issn.0254-508X.2024.05.003
Key Words:DES  component separation  hemicellulose  lignin  response surface method
Fund Project:国家自然科学绿色溶剂体系中纤维细胞壁区域脱木素规律及反应机理研究（项目批准号：32271807）；广东省自然科学基金：基于官能团调控的工业木质素绿色溶剂中定向催化解聚机制研究（项目编号：2024A1515011941）。
Author NameAffiliationPostcode
ZHANG Xing State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640
Experimental Teaching Demonstration Center of Light Industry and Food Science， South China University of Technology， Guangzhou， Guangdong Province， 510640 		510640
WU Shubin* State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640
Experimental Teaching Demonstration Center of Light Industry and Food Science， South China University of Technology， Guangzhou， Guangdong Province， 510640 		510640
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Abstract:In this study， a method for potassium hydroxide （KOH） pretreatment coupled with ternary deep eutectic solvent （DES） two-stage treatment was explored for component separation of eucalyptus. Initially， the KOH pretreatment conditions for separating hemicellulose from eucalyptus were optimized using methods of single-factor and Box-Behnken design. Subsequently， the microscopic morphology， specific surface area， and crystallinity of eucalyptus treated by KOH prepretreatment coupled with the ternary DES two-stage treatment were investigated. The results showed that the optimized KOH pretreatment conditions were determined as treatment temperature of 76 ℃， treatment time of 5 h， KOH mass fraction of 15%， at which the hemicellulose removal rate could reach （77.1±0.2）%. Following the KOH pretreatment coupled with ternary DES two-stage treatment （solid-liquid ratio of 1∶20（g∶mL）， reaction time of 30 min， and reaction temperature of 90 ℃）， the dense structure formed by cellulose， hemicellulose， and lignin in eucalyptus was disrupted， while the removal rates of hemicellulose and lignin reached 83.3% and 96.5%， respectively， while the retention rate of cellulose reached 91.0%. The specific surface area and relative crystallinity reached 0.901 5 m2/g and 89.7%， respectively， which significantly improved the contact surface area of subsequent solvents or biological enzymes.
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