Optimizing hemicelluloses pre-extraction in eucalyptus kraft pulping:A pathway towards enhancing pulp mill biorefineries  

作　　者：Yuhan Wang Danqi Xue Jingjing Zhuo Zhouyang Xiang 

机构地区：[1]State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640,China

出　　处：《Chinese Journal of Chemical Engineering》2024年第6期162-172,共11页中国化学工程学报（英文版）

基　　金：supported by the Natural Science Foundation of Guangdong Province(2023A1515030211);the National Natural Science Foundation of China(22278157);Guangzhou Science and Technology Program(2023B03J1365).

摘　　要：A critical pathway towards enhancing pulp mill biorefineries is to integrate the extraction and utilization of hemicelluloses into the pulping processes.Hence,an industrial pre-extraction strategy for hemicelluloses targeting eucalyptus kraft pulping process was developed.Alkaline solution or pulping white liquor was used to pre-extract hemicelluloses before the actual pulping process.The response surface methodology(RSM)technique was applied to investigate the most suitable conditions to maximize the yield of these hemicelluloses while simultaneously minimizing the damage to pulp yields and properties.Temperature(105 to 155℃),alkali concentration(3%to 8%),sulfidity(20%to 30%)and retention time(19 to 221 min)were combined to evaluate their effects on hemicellulose yields and chemical structures.The optimal pre-extraction conditions identified in this work(5.75%NaOH concentration,25%sulfidity at 135℃for 60 min)successfully allowed recovering 4.8%of hemicelluloses(based on the wood dry mass)and limited damages to pulp yields and properties.The cellulose content in pulp can even be increased by about 10%.Hemicellulose emulsification properties were also evaluated,which were comparable to synthetic emulsifiers.This study provides an industrial pathway to effectively separate and utilize wood hemicelluloses from the pulping process,which has the potential to improve the economy and material utilization of pulp and paper mills.

关 键 词：Hemicelluloses XYLAN Pre-extraction Kraft pulping EMULSIFYING Response surface methodology(RSM) 

分 类 号：TS72[轻工技术与工程—制浆造纸工程]