Author:
LIU WEN,ZHOU SHUKE,QI XIAOHUA,PU JUNWEN
Abstract
In this investigation, alkaline pretreatment before kraft pulping and combined post-treatments with xylanase and alkali after bleaching were applied to obtain an acetate-grade dissolving pulp. Bleaching sequences using oxygen or hydrogen peroxide were also studied. The brightness, α-cellulose content, and degree of polymerization (DP) of the bleached pulps from different bleaching sequences were evaluated. Alkaline pretreatment resulted in a higher α-cellulose content in the pulp. When a D1ED2P bleaching sequence was applied, the pulp obtained had an ISO brightness of 87.5%, a DP of 1050, and an α-cellulose content of 92.7%. The requirements for an acetate-grade dissolving pulp can then be met when followed by combined post-treatments with xylanase and alkali under the optimal conditions of 120 IU•g–1 xylanase dosage and 4% sodium hydroxide concentration.
Subject
Mechanical Engineering,General Materials Science,Media Technology,General Chemical Engineering,General Chemistry
Reference13 articles.
1. Thomas, L.V., “The capacity of acetate-grade dissolving pulp is growing steadily worldwide [in Chinese],” July 25, 2010. Available [Online] http://www.zgxws.com/news/show-294.html.
2. Funaki, Y., Ueda, K., Saka, S., et al., J. Appl. Polym. Sci. 48(1): 419(1993).
3. Neal, J.L., J. Appl. Polym. Sci. 9(6): 947(1965).
4. He, Jianxin, Cui, Shizhong, and Wang, Shan-yuan, J. Appl. Polym. Sci. 107(2): 1029(2008).
5. Waleed, W.A. and Ulrike, W.T., TAPPI J. 7(6): 3(2008).
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