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Effect of Phosphoric Acid Addition in the Pre-hydrolysis Stage on the Main Component Contents of Bamboo-willow
  
DOI：10.11980/j.issn.0254-508X.2018.04.006
Key Words:bamboo-willow  pre-hydrolysis  phosphoric acid  pentosan
Fund Project:国家重点研发计划（2017YFB0307900）；山东省自然科学基金（ZR2017LC016）。
Author NameAffiliation
ZHANG Jin-chao Key Lab of Pulp and Paper Science and Technology of Ministry of Education， Qilu University of Technology（Shandong Academy of Sciences）， Ji′nan， Shandong Province，250353 
WU Chao-jun* Key Lab of Pulp and Paper Science and Technology of Ministry of Education， Qilu University of Technology（Shandong Academy of Sciences）， Ji′nan， Shandong Province，250353 
YU Dong-mei Key Lab of Pulp and Paper Science and Technology of Ministry of Education， Qilu University of Technology（Shandong Academy of Sciences）， Ji′nan， Shandong Province，250353 
TONG Rui-ping Key Lab of Pulp and Paper Science and Technology of Ministry of Education， Qilu University of Technology（Shandong Academy of Sciences）， Ji′nan， Shandong Province，250353 
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Abstract:Pre-hydrolysis is a critical step in the production of dissolving pulp from the kraft process， and its main purpose is to hydrolyze the hemicelluloses as much as possible from cellulose fibers before subsequent pulping. In this paper， the effects of addition of phosphoric acid in the pre-hydrolysis process on the main component contents of bamboo-willow were explored. The result showed that with the addition of phosphoric acid in the pre-hydrolysis process of bamboo-willow and increasing the time at max temperature could help the removal of pentosan， but this was not conducive to the retention of α-cellulose. When the phosphoric acid dosage was 3% （based on oven dried bamboo-willow）， the max temperature was 165℃， the time at max temperature was 60 min， the pentosan content in the pre-hydrolyzed bamboo-willow was gradually decreasing， the α-cellulose content obviously increased as the liquid-to-wood ratio was 6∶1．
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