Effect of Eucalypt Pulp Pretreatment with Hot Acid Hydrolysis on (aZe)DP and (aZe)(EP)P Bleaching Performance

The effect of pulp pretreatment with hot acid hydrolysis on high consistency ozone bleaching was evaluated. An experimental plan was set up involving the full optimization of the A-stage and its application in Elemental Chlorine Free–ECF–[A/(aZe)DP and A(aZe)DP] and Total Chlorine Free–TCF–[A/(aZe)(...

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Bibliographic Details
Published in:Journal of wood chemistry and technology 2015-11, Vol.35 (6), p.424-437
Main Authors: Gomes, Valéria J., Guimarães, André L.S., Colodette, Jorge L., Métais, Alexis, Wennerström, Maria, Silva, Marcelo R., Sjodin, Lars, Hostachy, Jean-Christophe
Format: Article
Language:English
Subjects:
Bleaching
Chlorine
Consistency
Eucalypt
Fibers
hexenuronic acid
hot acid hydrolysis
Hydrolysis
Kraft pulp
Lignin
Optimization
ozone
Pulpwood
Strength
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Summary:The effect of pulp pretreatment with hot acid hydrolysis on high consistency ozone bleaching was evaluated. An experimental plan was set up involving the full optimization of the A-stage and its application in Elemental Chlorine Free–ECF–[A/(aZe)DP and A(aZe)DP] and Total Chlorine Free–TCF–[A/(aZe)(EP)P and A(aZe)(EP)P] sequences for eucalypt kraft pulp bleaching. The A-stage removed a significant amount of lignin and HexA from the pulp, and the subsequent Z-stage remained efficient after completion of the A-stage. The chemical savings caused by the A-stage were significant (∼7 kg ClO ₂/adt). The optimum conditions for the A-stage were pH 3.0, 90°C for 120 min, and 10% consistency. The strength properties of pulps bleached with the (aZe)DP (reference) and A/(aZe)DP ECF sequences were similar, but the TCF sequence A/(aZe)(EP)P delivered slightly lower strength properties than the ECF sequences. Fiber peeling studies indicated that the HexA present in the kraft pulp is not concentrated on the fiber surface, as previously thought.
ISSN:1532-2319
0277-3813
1532-2319
DOI:10.1080/02773813.2015.1025283