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| Study on the Swelling Behavior and Component Separation Characteristics of Chemical Pulp in NMMO/H2O |
| Received:September 22, 2025 Revised:October 21, 2025 |
| DOI：10.11980/j.issn.0254-508X.2026.04.009 |
| Key Words:chemical pulp NMMO swelling hemicellulose component separation |
| Fund Project:国家自然科学基金（22208247，32171727）；天津市科技重大专项与工程 （25ZXZSSS00800）；天津市自然科学基金（24JCQNJC00330）。 |
| Author Name | Affiliation | Postcode | | CHEN Peisi* | 1School of Light Industry Science and Engineering, State Key Lab of Bio-based Fiber Materials, China Textile Industry Key Lab of High-performance Fibers Wet-laid Nonwoven Materials, Tianjin Key Lab of Pulp and Paper, Tianjin University of Science ＆ Technology, Tianjin, 300457 | 300457 | | ZHAO Jiawei | 1School of Light Industry Science and Engineering, State Key Lab of Bio-based Fiber Materials, China Textile Industry Key Lab of High-performance Fibers Wet-laid Nonwoven Materials, Tianjin Key Lab of Pulp and Paper, Tianjin University of Science ＆ Technology, Tianjin, 300457 | 300457 | | KONG Lingmei | 1School of Light Industry Science and Engineering, State Key Lab of Bio-based Fiber Materials, China Textile Industry Key Lab of High-performance Fibers Wet-laid Nonwoven Materials, Tianjin Key Lab of Pulp and Paper, Tianjin University of Science ＆ Technology, Tianjin, 300457 | 300457 | | CHENG Bowen | 1School of Light Industry Science and Engineering, State Key Lab of Bio-based Fiber Materials, China Textile Industry Key Lab of High-performance Fibers Wet-laid Nonwoven Materials, Tianjin Key Lab of Pulp and Paper, Tianjin University of Science ＆ Technology, Tianjin, 300457 | 300457 | | ZHANG Hongjie* | 2China National Pulp and Paper Research Institute Co., Ltd., Beijing, 100102
3National Engineering Lab for Pulp and Paper, Beijing, 100102 | 100102 | | YANG Shuo* | 1School of Light Industry Science and Engineering, State Key Lab of Bio-based Fiber Materials, China Textile Industry Key Lab of High-performance Fibers Wet-laid Nonwoven Materials, Tianjin Key Lab of Pulp and Paper, Tianjin University of Science ＆ Technology, Tianjin, 300457 | 300457 |
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| Abstract:This study took bleached broadleaf wood chemical pulp as the raw material and systematically investigated the variation patterns of fiber dimensions， swelling degree， solvent uptake， and component content of pulp in the N-methylmorpholine-N-oxide/water (NMMO/H₂O) system. The separation behavior and mechanisms of hemicellulose in chemical pulp under the NMMO/H₂O system were clarified. The results showed that NMMO content and temperature were the core parameters regulating the swelling behavior of pulp. The optimal swelling effect was achieved at 100 ℃ with an NMMO mass fraction of 70%. The NMMO pretreatment process exhibited significant selective separation of pulp components， with the hemicellulose removal process showing distinct time dependence. A substantial amount of hemicellulose was dissolved within the initial 2 min of treatment， reducing its content in the pulp from 20.29% to 11.37% and enriching it to 98.22% in the filtrate. Further analysis revealed that NMMO primarily promotes swelling through the physical disruption of the hydrogen bond network between cellulose molecules， while no significant changes were observed in the chemical structure or crystalline form of cellulose. |
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