The impact of bleaching on the yield of softwood kraft pulps obtained by high alkali impregnation
Source abstract
Abstract
Abstract High alkali impregnation (HAI) increases the total yield of softwood pulps following kraft cooking. This yield improvement is also maintained after oxygen delignification. This study evaluates how bleaching with either chlorine dioxide or hydrogen peroxide affects the final yield of samples obtained with standard and HAI. The chemical composition, viscosity, brightness, mechanical and morphological properties were studied. Compared to cooking after standard impregnation the yield improvement achieved by HAI was preserved in both types of bleaching sequences (2 % units for chlorine dioxide and 4 % units for hydrogen peroxide). The introduction of charged groups into the cellulose fibers was higher with hydrogen peroxide bleaching than with chlorine dioxide however, no significant impact was seen on the swelling or mechanical properties. The brightness was higher for the pulps bleached with chlorine dioxide compared with hydrogen peroxide. Hydrogen peroxide bleaching resulted in similar brightness development for both standard and HAI. Fibers bleached with chlorine dioxide had the highest curl index (16–17 %) compared to the fibers bleached with hydrogen peroxide (15 %).
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Research context
OpenAlex topics: Lignin and Wood Chemistry · Advanced Cellulose Research Studies · Wood Treatment and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
388792 RISE Research Institutes of Sweden , Bioeconomy and Health, Pulp, Paper and Packaging , Drottning Kristinas väg 61 , Stockholm , Sweden
KTH Royal Institute of Technology , Department of Fiber and Polymer Technology , Stockholm , Sweden
166474 KTH Royal Institute of Technology , Department of Engineering Mechanics, Solid Mechanics , Stockholm , Sweden
References (46)
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