Does the kappa number method accurately reflect lignin content in nonwood pulps?

S. Burkhardt
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引用次数: 1

Abstract

The traditional kappa number method was developed in 1960 as a way to more quickly determine the level of lignin remaining in a completed or in-progress pulp. A significantly faster approach than the Klason lignin procedure, the kappa number method is based on the reaction of a strong oxidizing agent (KMnO4) with lignin and small amounts of other organic functional groups present in the pulp, such as hexenuronic acid. While the usefulness of the kappa number for providing information about bleaching requirements and pulp properties has arguably transformed the pulp and paper industry, it has been mostly developed for kraft, sulfite, and soda wood pulps. Nonwood species have a different chemical makeup than hardwood or softwood sources. These chemical differ-ences can influence kappa and Klason measurements on the pulp and lead to wide ranges of error. Both original data from Sustainable Fiber Technologies’ sulfur and chlorine-free pulping process and kappa and Klason data from various nonwood pulp literature sources will be presented to challenge the assumption that the kappa number accurately represents lignin content in nonwood pulps.
卡帕数法能准确反映非木浆中的木质素含量吗?
传统的卡帕数法是在1960年发展起来的,作为一种更快速地确定完成或正在进行的纸浆中剩余木质素水平的方法。kappa数法是一种比Klason木质素法快得多的方法,它是基于一种强氧化剂(KMnO4)与木质素和纸浆中存在的少量其他有机官能团(如己醛酸)的反应。虽然卡帕数在提供有关漂白要求和纸浆性能的信息方面的有用性已经改变了纸浆和造纸工业,但它主要是为硫酸盐、亚硫酸盐和苏打木浆开发的。非木材种类与硬木或软木来源具有不同的化学组成。这些化学差异会影响纸浆的kappa和Klason测量,并导致较大的误差范围。来自Sustainable Fiber Technologies的无硫和无氯制浆过程的原始数据以及来自各种非木浆文献来源的kappa和Klason数据将被提出,以挑战kappa数准确代表非木浆中木质素含量的假设。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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