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| Study on Deep Prehydrolysis-kraft Pulping Treatment of Bamboo Dissolving Pulp |
| Received:November 22, 2024 |
| DOI：10.11980/j.issn.0254-508X.2025.04.013 |
| Key Words:prehydrolysis-kraft pulping bamboo hemicellulose lignin cellulose |
| Fund Project:国家重点研发计划 （2023YFD2201903）；福建省引导性项目 （2023H0008）。 |
| Author Name | Affiliation | Postcode | | LIN Kairui* | College of Materials Engineering, National Forestry & Grassland Administration Key Lab for Plant Fiber Functional Materials, Fujian Agriculture and Forestry University, Fuzhou, Fujian Province, 350108 | 350108 | | GUO Xuefang | College of Materials Engineering, National Forestry & Grassland Administration Key Lab for Plant Fiber Functional Materials, Fujian Agriculture and Forestry University, Fuzhou, Fujian Province, 350108 | 350108 | | NIU Shengyue | College of Materials Engineering, National Forestry & Grassland Administration Key Lab for Plant Fiber Functional Materials, Fujian Agriculture and Forestry University, Fuzhou, Fujian Province, 350108 | 350108 | | HUANG Liulian | College of Materials Engineering, National Forestry & Grassland Administration Key Lab for Plant Fiber Functional Materials, Fujian Agriculture and Forestry University, Fuzhou, Fujian Province, 350108 | 350108 | | HU Huichao | College of Materials Engineering, National Forestry & Grassland Administration Key Lab for Plant Fiber Functional Materials, Fujian Agriculture and Forestry University, Fuzhou, Fujian Province, 350108 | 350108 | | LI Jianguo | College of Materials Engineering, National Forestry & Grassland Administration Key Lab for Plant Fiber Functional Materials, Fujian Agriculture and Forestry University, Fuzhou, Fujian Province, 350108 | 350108 | | CHEN Lihui* | College of Materials Engineering, National Forestry & Grassland Administration Key Lab for Plant Fiber Functional Materials, Fujian Agriculture and Forestry University, Fuzhou, Fujian Province, 350108 | 350108 |
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| Abstract:Bamboo dissolving pulp was prepared from moso-bamboo using the prehydrolysis-kraft pulping treatment， and the effects of prehydrolysis time， cooking holding time， and alkali charge on the degradation/removal of hemicellulose and lignin from bamboo were investigated. The results showed that the prehydrolysis treatment could effectively dissolve the hemicellulose in bamboo， and extending the prehydrolysis time could significantly reduce the content of hemicellulose in bamboo， increase the mass concentration of monosaccharides and total sugars in the hydrolysate， and achieve the efficient hemicellulose removal. At the same time， dissolving hemicellulose increased the numbers of pore in bamboo and made the structure loose， which was conducive to the drug penetration and the degradation/removal of lignin during the cooking stage. After 160 min of prehydrolysis， the cellulose content of bamboo was 57.4%， the hemicellulose content was 7.2%， the yield was 66.8%， and the xylose and total xylo mass concentration of the hydrolysate reached the maximum value， which was 12.9 and 23.1 g/L， respectively. During the kraft cooking process， increasing the alkali charge and extending the cooking holding time both could enhance the removal of lignin and hemicellulose in bamboo dissolving pulp， thus reducing the Kappa value and the content of pentosan and increasing the α-cellulose content of bamboo dissolving pulp. Under the conditions of alkali charge of 20%（based on NaOH）， sulfidity of 27%， liquid ratio of 1∶4， cooking temperature of 170 ℃， and cooking holding time of 90 min， the Kappa value of bamboo dissolving pulp was 7.5， the content of pentose was 2.1%， the content of α-cellulose was 90.8%， and the viscosity was 740 mL/g. |
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