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| Research on Nitric Acid Pulping of Populus X |
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| DOI：10.11981/j.issn.1000-6842.2018.03.9 |
| Key Words:Populus X; nitric acid; pulping; bleaching |
| Fund Project:中央高校基本科研业务基金项目（2572016CB02）；大学生创新项目（201610225179）。 |
| Author Name | Affiliation | | DUAN Xiao-yu1 | 1. Materials Science and Engineering College, Northeast Forestry University, Harbin, Heilongjiang Province, 150040 | | YANG Dong-mei1,* | 1.Materials Science and Engineering College, Northeast Forestry University, Harbin, Heilongjiang Province, 150040 | | QIAN Xue-ren1 | 1.Materials Science and Engineering College, Northeast Forestry University, Harbin, Heilongjiang Province, 150040 | | LI Jin-song2 | 2.Mudanjiang Hengfeng Paper Co.,Ltd.， Mudanjiang, Heilongjiang Province, 157013 | | XUE Shun-lan2 | 2.Mudanjiang Hengfeng Paper Co.,Ltd.， Mudanjiang, Heilongjiang Province, 157013 |
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| Abstract: |
| The pulping property of hardwood poplar （Populus X）using nitric acid aqueous solution as a cooking agent under atmospheric pressure was studied. Effects of the cooking temperature, nitric acid concentration, the cooking time and wood solid to liquid ratio on the pulp property were discussed, and the bleach ability of the pulp was studied. The results showed that the pulp yield reached 58.6% after cooking for 268 min with a maximum cooking temperature of 85℃, a nitric acid concentration of 10%, and a liquid ratio of 1∶10. The potassium permanganate value of the pulp was in the range of 4~8. The brightness of single stage bleaching with NaClO or H2O2 was lower than that of bleaching combined using NaOH, the brightness of NaOH-NaClO bleached pulp was 84.6% when NaClO bleaching for 3 h, and the bleaching effect was the best. |
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