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Investigation of the Effect of Combined PFI/Ultrasonic Treatment on the Solubility Performance of Dissolving Pulp in NMMO Solution
Received:December 21, 2023  
DOI：10.11980/j.issn.0254-508X.2024.06.005
Key Words:ultrasound  PFI  dissolving pulp  N-methylmorpholine-N-oxide  solubility property
Fund Project:国家自然科学基金面上项目（32171727）。
Author NameAffiliationPostcode
ZHANG Jiaolong Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials， Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery， Dalian Polytechnic University， Dalian， Liaoning Province， 116034
China National Pulp and Paper Research Institute Co.， Ltd.，Beijing， 100102
National Engineering Lab for Pulp and Paper， Beijing， 100102 		100102
HOU Leilei China National Pulp and Paper Research Institute Co.， Ltd.，Beijing， 100102
National Engineering Lab for Pulp and Paper， Beijing， 100102 		100102
ZHANG Hongjie ‍* China National Pulp and Paper Research Institute Co.， Ltd.，Beijing， 100102
National Engineering Lab for Pulp and Paper， Beijing， 100102 		100102
ZHANG Xue China National Pulp and Paper Research Institute Co.， Ltd.，Beijing， 100102
National Engineering Lab for Pulp and Paper， Beijing， 100102 		100102
LI Haiming ‍* Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials， Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery， Dalian Polytechnic University， Dalian， Liaoning Province， 116034 116034
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Abstract:A sequential treatment consisting of initial PFI refining， followed by ultrasonic treatment was performed on pre-hydrolyzed sulfate dissolving pulp fibers in this study. The results showed that after the PFI/ultrasonic synergistic treatment， the surface morphology of dissolving pulp fibers was destroyed， most of the primary wall and S1 layer of the secondary wall were removed， and the specific surface area， pore volume， and pore diameter became larger. Softwood dissolving pulp pore diameter increased from 16.76 nm to 21.85 nm from the untreated treatment and from 16.74 nm to 21.61 nm for hardwood dissolving pulp. The changes in fiber morphology characteristics caused a significant increase in the water retention value and absorbency of dissolving pulp fibers. Softwood and hardwood dissolving pulp water retention values increased by 205.0% and 78.5%， respectively， while the cellulose crystallinity， intrinsic viscosity and molecular weight were reduced. The PFI/ultrasonic synergistic treatment could effectively improve the solubility of dissolving pulp in NMMO solution.
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