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| Effect of Hydrothermal Pretreatment on the Preparation of Eucalyptus Dissolving Pulp |
| Received:October 16, 2020 |
| DOI：10.11980/j.issn.0254-508X.2021.03.001 |
| Key Words:hydrothermal pretreatment sulfate cooking chlorine dioxide bleaching dissolving pulp |
| Fund Project:国家自然科学基金(21968004)。 |
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| Abstract:In this study， a hydrothermal pretreatment method was used to assist the preparation of eucalyptus dissolving pulp. The effects of maximum temperature， time at maximum temperature and pH value of hydrothermal pretreatment on the yield of sulfate pulping were studied. The results showed that the yield of unbleached pulp gradually decreased with the intensification of pretreatment. The dissolution of hemicellulose increased with the increase of the pH value of the hydrolysate. At higher pH values， it was dissolved mainly in the form of xylo-oligosaccharides， resulting in a significant effect of the pH value of the hydrolysate on the yield of unbleached pulp. The results also showed that the brightness and α-cellulose content of bleached pulp increased with the increase of pH value of the hydrolysate. The optimum hydrothermal pretreatment conditions were as follows： the maximum temperature was 170℃， holding time was 60 min， pH value was 4.9.After hydrothermal pre-hydrolysis， sulfate cooking and ECF bleaching， the brightness of the bleached pulp was 93.3% and the content of α-cellulose was 93.32%， which reached the quality requirement of dissolving pulp. FT-IR spectrum showed that the hemicellulose in raw materials could be removed well by hydrothermal pretreatment. |
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