Journal
BIORESOURCE TECHNOLOGY
Volume 99, Issue 17, Pages 8453-8457Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2008.02.055
Keywords
kraft pulping; non-sulfur pulping; prehydrolysis; oxygen delignification; ClO2 bleaching
Funding
- Empire State Paper Research Associates (ESPRA)
- US Forest Service [03-JV-11231300-048]
- NSF [CHE 0553323]
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The positive aspects of the non-sulfur soda/anthraquinone (SAQ) process are mostly tied to improved energy efficiency while lower pulp brightness after bleaching is its most significant drawback. A credible method that quantifies bleachability as well as an approach that solves the problem for SAQ pulps from hardwoods will be described. A straight line correlation (R-2 = 0.904) was obtained between O-2 kappa number and final light absorption coefficient (LAC) value after standardized OD0EpD1 bleaching of nine hardwood kraft pulps from three laboratories and one pulp mill. The bleachability of pulps from four different soda processes catalyzed by anthraquinone (AQ) and 2-methylanthraquinone (MAC) was compared to that of conventional kraft pulps by comparing O-2 kappa number decrease and final LAC values. It was observed that a mild hot water pre-hydrolysis improved the bleachability of SAQ pulps to a level equal to that of kraft. (c) 2008 Elsevier Ltd. All rights reserved.
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