Viscosity control and reactivity improvements of cellulose fibers by cellulase treatment

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• 作者：Chao Duan ; Saurabh Kumar Verma ; Jianguo Li ; Xiaojuan Ma ; Yonghao Ni
• 关键词：Cellulase treatment ; Viscosity ; Reactivity ; Accessibility ; Dissolving pulp
• 刊名：Cellulose
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：23
• 期：1
• 页码：269-276
• 全文大小：1,716 KB
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• 作者单位：Chao Duan (1) (2)
  Saurabh Kumar Verma (2) (3)
  Jianguo Li (1) (2)
  Xiaojuan Ma (2) (4)
  Yonghao Ni (1) (2)
  
  1. Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science and Technology, Tianjin, 300457, China
  2. Limerick Pulp and Paper Centre, University of New Brunswick, Fredericton, NB, E3B 5A3, Canada
  3. Department of Chemistry, Indian Institute of Technology, Guwahati, 781039, India
  4. College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Bioorganic Chemistry
  Physical Chemistry
  Organic Chemistry
  Polymer Sciences
  
• 出版者：Springer Netherlands
• ISSN：1572-882X

文摘

Cellulase treatment for decreasing viscosity of cellulose (dissolving pulp) is a promising approach to reduce the use of toxic chemicals, such as hypochlorite in the dissolving pulp manufacturing process. In this study, the use of an endoglucanase-rich cellulase to replace the hypochlorite for this purpose and its improvements of the Fock reactivity were investigated. The results showed that at a given viscosity level, the replacement of hypochlorite treatment with a cellulase treatment in the bleach plant under otherwise the same conditions led to a higher Fock reactivity (72.0 vs 46.7 %). These results were due to the enzymatic peeling/etching mechanism, which partially peeled the primary wall of the fibers, thus improving the accessibility of fibers. The improved accessibility of the enzymatic treated pulp was supported by the positive fiber morphological changes determined, based on the SEM, BET and WRV methods. The alkali solubility results further supported the conclusion. Keywords Cellulase treatment Viscosity Reactivity Accessibility Dissolving pulp