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Improvements of the Viscosity Control and Reactivity of Dissolving Pulp by Using Heteropoly Acid-based Catalytic Hydrolysis of Cellulose Fibers
Received:November 30, 2020  
DOI：10.11980/j.issn.0254-508X.2021.04.002
Key Words:dissolving pulp  heteropoly acid  catalytic hydrolysis  viscosity  reactivity
Fund Project:国家自然科学基金青年基金（31700510）；国家留学基金委项目（201908610074）；陕西科技大学“生物质化学与材料”院士工作室项目（134090002）。
Author NameAffiliationPostcode
WANG Xinqi College of Bioresources Chemical and Materials Engineering， Shaanxi Provincal Key Lab of Papermaking Technology and Specialty Paper Development， National Demonstration Center for Experimental Light Chemistry Engineering Education， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 710021
DUAN Chao College of Bioresources Chemical and Materials Engineering， Shaanxi Provincal Key Lab of Papermaking Technology and Specialty Paper Development， National Demonstration Center for Experimental Light Chemistry Engineering Education， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 710021
QIN Xiaoyu College of Bioresources Chemical and Materials Engineering， Shaanxi Provincal Key Lab of Papermaking Technology and Specialty Paper Development， National Demonstration Center for Experimental Light Chemistry Engineering Education， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 710021
LU Wanli College of Bioresources Chemical and Materials Engineering， Shaanxi Provincal Key Lab of Papermaking Technology and Specialty Paper Development， National Demonstration Center for Experimental Light Chemistry Engineering Education， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 710021
ZHAO Yudong College of Bioresources Chemical and Materials Engineering， Shaanxi Provincal Key Lab of Papermaking Technology and Specialty Paper Development， National Demonstration Center for Experimental Light Chemistry Engineering Education， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 710021
XU Yongjian College of Bioresources Chemical and Materials Engineering， Shaanxi Provincal Key Lab of Papermaking Technology and Specialty Paper Development， National Demonstration Center for Experimental Light Chemistry Engineering Education， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 710021
NI Yonghao College of Bioresources Chemical and Materials Engineering， Shaanxi Provincal Key Lab of Papermaking Technology and Specialty Paper Development， National Demonstration Center for Experimental Light Chemistry Engineering Education， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 710021
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Abstract:In this work， four typical Keggin-type heteropoly acid （HPA）， including phosphotungstic acid （PTA）， silicotungstic acid （STA）， silimolybdic acid （SMA） and phosphomolybdic acid （PMA） were used to activate the PHK-based dissolving pulp. Through comparing the changes of the intrinsic viscosity of the pulp optimized the treatment conditions were H+ concentration of 0.01 mol/L at 90℃ for 30 min. Based on the changes of fiber accessibility in terms of micro morphology and structure， pore size， pore volume and water retention value， it was evident that PTA treatment was better than other treatments. As a result of optimized PTA treatment， the viscosity of the resultant dissolving pulp reduced from 561 mL/g to 437 mL/g and the reactivity correspondingly increased from 49.1% to 74.1%， which was the most significant one. The recovery rates of these HPAs were very high， more than 87% for PTA， STA and PMA， and 83.6% for SMA when the first recycling. Moreover， among those HPAs， PTA had the highest chemical stability， recyclability and reusability， and maintained a reuse rate of 87.1% after recycling six times.
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