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Optimization of Process Conditions for Preparing Nanocellulose Crystals by Oxalic Acid Hydrolysis
  
DOI：10.11980/j.issn.0254-508X.2019.01.004
Key Words:oxalic acid  nanocellulose crystal  response surface method  optimum process
Fund Project:国家自然科学基金项目（No.31570569）；广东省基金博士启动纵向协同创新项目（No.2017A030310341）；制浆造纸工程国家重点实验室项目（No.2017QN01）。
Author NameAffiliation
LI Bingyun State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 
GENG Qingjie State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 
WANG Ranran State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 
FU Shiyu* State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 
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Abstract:The response surface method was used to design the conditions for preparing nanocellulose crystals by oxalic acid hydrolysis and three important affecting factors oxalic acid mass fraction，reaction temperature and time were designed by Design-Export software. The codinge quation was obtained by software optimization, the optimal reaction conditions were as follows: reaction temperature was 112℃， oxalic acid concentration was 36%， reaction time was 2.5 h， the homogenization time was 50 min,the crystallinity of nanocellulose obtained under the optimal process condition in the experiment was 65%， and nanocellulose crystals accounted for 91.6% of the yield of nanocellulose products， which was consistent with the predicted value of 91.4%. The results indicated that the coding equation was reasonable and effective．
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