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Lignocellulosic fiber charge enhancement by catalytic oxidation during oxygen delignification.
MedLine Citation:
PMID:  17107682     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
A series of one-stage oxygen delignification treatments with a softwood (SW) kraft pulp were studied employing 0.0-0.5% of a bismuth ruthenium pyrochlore oxide catalyst. The results demonstrated that a 0.09-0.18% charge of catalyst in an oxygen stage provided a 52.2-116.0% increase of carboxylic acid groups in the cellulosic component of kraft pulps without a significant decrease in fiber viscosity. A 3-factor at 3-level (L(9)3(3)) orthogonal experimental design was used to identify the main factors influencing acid group formation in pulp carbohydrates. The relative significance of experimental parameters for polysaccharide acid group formation was the molar equivalent NaOH, oxygen pressure, and finally, reaction temperature under the experimental conditions studied. The optimized reaction parameters for fiber charge development were shown to be 85-100 degrees C, 2.5% NaOH, and 800-960 kPa oxygen pressure. Pulps with higher fiber carboxylic acid content introduced by catalytic oxidation during oxygen delignification yielded a 10.9-33.7% increase in fiber charge after elemental chlorine free (ECF) pulp bleaching. The enhanced fiber charge resulted in 6.7-17.1% increase in paper sheet tensile index at comparable pulp viscosity.
Authors:
Dongcheng Zhang; Xin-Sheng Chai; Yunqiao Pu; Arthur J Ragauskas
Publication Detail:
Type:  Journal Article     Date:  2006-10-26
Journal Detail:
Title:  Journal of colloid and interface science     Volume:  306     ISSN:  0021-9797     ISO Abbreviation:  J Colloid Interface Sci     Publication Date:  2007 Feb 
Date Detail:
Created Date:  2006-12-26     Completed Date:  2007-02-13     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0043125     Medline TA:  J Colloid Interface Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  248-54     Citation Subset:  -    
Affiliation:
School of Chemical and Biomolecular Engineering, Atlanta, GA 30332-0620, USA.
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