Startseite Elucidating carboxylic acid profiles for extended oxygen delignification of high-kappa softwood kraft pulps
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Elucidating carboxylic acid profiles for extended oxygen delignification of high-kappa softwood kraft pulps

  • Dongcheng Zhang , Yunqiao Pu , Xing-Sheng Chai , Ved Naithani , Hasan Jameel und Arthur J. Ragauskas
Veröffentlicht/Copyright: 7. März 2006
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Holzforschung
Aus der Zeitschrift Band 60 Heft 2

Abstract

Two laboratory high-lignin-content softwood (SW) kraft pulps with kappa values of 48.0 and 49.5, prepared by cooking at high and low active alkali (AA), were used for the study of fiber charge development during two-stage oxygen delignification with inter-stage washing (OwO). It was established that the first oxygen delignification (O) stage increased total fiber charge by 2–4%, and further O-delignification via a second O-stage led to a 3–18% decrease in total fiber charge. Carboxylic acid content in pulp holocelluloses decreased by 12–26% with respect to a 35–70% kappa number reduction due to an O and OwO stage of delignification for high and low AA cooked SW kraft pulps. After an OwO-stage delignification, the residual lignin was found to exhibit a 50–100% increase in carboxylic acid content. 13C NMR spectral data for the residual lignin samples indicated that the unconjugated/conjugated acid ratio was approximately (3–4):1. Generally, the carboxylic acid content in low AA cooked softwood kraft pulp and the corresponding oxygen-delignified pulps was systematically higher (13–23%) than that in high AA cooked SW kraft pulp and the corresponding oxygen-delignified pulps. The experimental results also demonstrated that maximum acid-group content in total fiber occurred after 45–50% oxygen delignification of the SW kraft pulps studied.

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Corresponding author. Arthur J. Ragauskas, Institute of Paper Science and Technology, Georgia Institute of Technology, 500 10th Street, Atlanta, GA 30332-0620, USA Fax: +1-404-8944778

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Published Online: 2006-03-07
Published in Print: 2006-03-01

©2006 by Walter de Gruyter Berlin New York

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