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Improving the Cellulose Purity of Dissolving Pulp by Cold Caustic Extraction
  
DOI:10.11980/j.issn.0254-508X.2015.04.001
Key Words:dissolving pulp  α-cellulose  cold caustic extraction (CCE)  hemicellulose  xylanase
Author NameAffiliation
TIAN Chao1,2,3,4,* China National Pulp and Paper Research Institute, Beijing, 100102
National Engineering Lab for Pulp and Paper, Beijing, 100102
Tianjin Key Lab of Pulp and Paper, Tianjin University of Science and Technology, Tianjin,300457
Limerick Pulp and Paper Center, University of New Brunswick, Fredericton, Canada, E3B5A3
 
ZHENG Lin-qiang4 Limerick Pulp and Paper Center, University of New Brunswick, Fredericton, Canada, E3B5A3 
MIAO Qing-xian5 Fujian Agriculture and Forestry University, Fuzhou, Fujian Province, 350002 
NI Yong-hao3,4 Tianjin Key Lab of Pulp and Paper, Tianjin University of Science and Technology, Tianjin,300457
Limerick Pulp and Paper Center, University of New Brunswick, Fredericton, Canada, E3B5A3
 
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Abstract:Cellulose purity is of critical importance for dissolving pulp. The cold caustic extraction (CCE) process was employed to purify dissolving pulps in this study. When a pre hydrolysis kraft based hardwood dissolving pulp was treated under the CCE conditions of 22% NaOH solution, 20% pulp consistency, 35℃, and 1 h duration, its α cellulose content was increased from the original 94.84% to 98.51%.NaOH concentration was proved the dominator affecting the CCE result. CCE showed very high selectivity in extracting the xylan hemicellulose from pulp samples, while the glucomannan hemicellulose could only be removed under the NaOH concentrations above 10%. CCE was more effective than xylanase treatment in purifying dissolving pulp.
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