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| Research on the Pulping Process for Preparing Edgeworthia chrysantha Pulp with High Degree of Polymerization by AS-AQ Method |
| Received:March 26, 2025 |
| DOI：10.11980/j.issn.0254-508X.2025.06.016 |
| Key Words:Edgeworthia chrysantha AS-AQ method degree of polymerization cooking |
| Fund Project:国家科技基础资源调查专项（2019FY100900）。 |
| Author Name | Affiliation | Postcode | | JING Shaoyun* | School of Light Industry and Engineering, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | LI Hailong | School of Light Industry and Engineering, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | CHEN Dong | School of Light Industry and Engineering, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | HU Zihao | School of Light Industry and Engineering, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | LIU Mengru* | School of Light Industry and Engineering, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 |
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| Abstract:In this study， using Edgeworthia chrysantha as the raw material to prepare pulp with a high degree of polymerization， four differernt cooking methods were compared， including caustic soda （NaOH） method， caustic soda-anthraquinone （NaOH-AQ） method， kraft （KP） method and alkaline sodium sulfite-anthraquinone （AS-AQ） method. The results showed that the degree of polymerization of Edgeworthia chrysantha pulp after AS-AQ method cooking was the highest， and the pulp yield and whiteness were relatively high， with a large fiber length-to-width ratio. By the means of response surface analysis experiments， more suitable process conditions for preparing Edgeworthia chrysantha pulp with a high degree of polymerization were optimized as follows： the alkali dosage of 13.9%， the degree of sulfitation of 54.7%， the maximum temperature of 137 ℃， the heating-up time of 1.5 h， the holding time of 2.5 h， and the liquid-to-solid ratio of 1∶6. Under these conditions， the yield of R16 of Edgeworthia chrysantha pulp was 35.0%， the degree of polymerization reached up to 1 942， the fiber length-to-width ratio was 189， and the whiteness of the paper was 63.1%. Then the tensile index， burst index， and tear index were 42.0 N·m/g， 2.55 kPa·m²/g， and 22.0 mN·m²/g， respectively. Thus， it could be seen that AS-AQ method cooking here could effectively increase the degree of polymerization while ensuring the pulp yield， providing a technical basis for the development of pulp products with high added value. |
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