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| Effects of Lignin Parent Small Molecules on Cellulose Esterification and Pulp Bleachability in Formic Acid Systems |
| Received:April 28, 2025 Revised:May 21, 2025 |
| DOI：10.11980/j.issn.0254-508X.2025.10.005 |
| Key Words:formic acid lignin parent small molecules cellulose formate bleaching |
| Fund Project:国家自然科学基金青年科学基金项目（02056294，32271821）；全国重点实验室建设重大科研专项（2025ZDGZ02）；济南高校二十条创新团队项目（202228076）。 |
| Author Name | Affiliation | Postcode | | ZHANG Hongyu* | State Key Lab of Green Papermaking and Resource Recycling, Qilu University of Technology （Shandong Academy of Sciences）, Ji’nan, Shandong Province, 250353
School of Chemistry and Chemical Engineering, Qilu Normal University, Ji’nan, Shandong Province, 250200 | 250200 | | NI Shuzhen* | State Key Lab of Green Papermaking and Resource Recycling, Qilu University of Technology （Shandong Academy of Sciences）, Ji’nan, Shandong Province, 250353
School of Chemistry and Chemical Engineering, Qilu Normal University, Ji’nan, Shandong Province, 250200 | 250200 | | ZHANG Yongchao* | State Key Lab of Green Papermaking and Resource Recycling, Qilu University of Technology （Shandong Academy of Sciences）, Ji’nan, Shandong Province, 250353
School of Chemistry and Chemical Engineering, Qilu Normal University, Ji’nan, Shandong Province, 250200 | 250200 | | CHEN Xiaoqian | State Key Lab of Green Papermaking and Resource Recycling, Qilu University of Technology （Shandong Academy of Sciences）, Ji’nan, Shandong Province, 250353
School of Chemistry and Chemical Engineering, Qilu Normal University, Ji’nan, Shandong Province, 250200 | 250200 | | WANG Zhaojiang | State Key Lab of Green Papermaking and Resource Recycling, Qilu University of Technology （Shandong Academy of Sciences）, Ji’nan, Shandong Province, 250353
School of Chemistry and Chemical Engineering, Qilu Normal University, Ji’nan, Shandong Province, 250200 | 250200 | | QIN Menghua* | School of Chemistry and Chemical Engineering, Qilu Normal University, Ji’nan, Shandong Province, 250200 | 250200 |
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| Abstract:In this study， the cooking system composed of lignin-like parent small molecules and formic acid was used to explore the effect of cooking reaction on cellulose structure. At the same time， the microcrystalline cellulose simulation micro-experiment was used to characterize the cellulose structure after cooking. The content of cellulose ester bond in formic acid system was explored， the position of esterification reaction was speculated， and the relationship between pulp whiteness and pH of bleaching system was constructed. The results showed that the esterification rate of cellulose was about 7.01% under a single formic acid system， in the cooking system with different types of lignin parent small molecules and formic acid. According to NMR analysis， it was speculated that cellulose esterification occurred in C2，C3 and C6 bonds. After conducting bleaching on the cooked pulp， it was discovered that compared with the unbleached pulp， after adding 6% NaOH and 2% H2O2， the brightness of the pulp increased from 71.3% to 81.4%， and the tensile index decreased from 31.5 N·m/g to 26.9 N·m/g. At the same time， it was found that the pulp obtained by adding lignin-like parent small molecules had a relatively small contact angle compared with the pulp obtained by single formic acid cooking， indicating that single formic acid cooking would generate more ester bonds on the cellulose surface. |
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