Effects of lignin chemistry on oxygen delignification performance

July 2018 Pub Date : 2018-08-01 DOI:10.32964/TJ17.07.373

Valéria J. Gomes, H. Jameel, Hou‐min Chang, R. Narron, J. Colodette, P. Hart

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引用次数: 5

Abstract

The present work focused on characterizing the chemical and structural properties of isolated lignin from six hardwoods and their kraft pulps in an attempt to better understand the relationship between lignin’s chemical properties and resultant oxygen delignification performance. Several hardwood samples were cooked under the same conditions with varying alkali charges to obtain unbleached pulps with kappa numbers between 19 and 20. These pulps were then subjected to an oxygen delignification stage. Both processes were evaluated for pulp quality, residual lignin, and O-stage delignification efficiency. The oxygen delignification stage was carried out under fixed conditions and evaluated with regards to kappa number, which was corrected for hexenuronic acid (HexA) contributions.Results revealed that different hardwood species exhibited differing oxygen delignification efficiencies. A high correlation was found between the O-stage delignification efficiency and the content of phenolic groups in the unbleached lignin, which confirmed that free phenolic groups are the reactive site for molecular oxygen attack. When different hardwood species were compared, the HexA contents were not found to affect O-stage delignification efficiencies.

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木质素化学对氧脱木质素性能的影响

本文研究了从六种阔叶树及其硫酸盐浆中分离得到的木质素的化学性质和结构性质，以期更好地了解木质素的化学性质与氧脱木质素性能之间的关系。几个硬木样品在相同的条件下用不同的碱电荷煮熟，得到kappa值在19到20之间的未漂白纸浆。然后将这些纸浆置于氧气脱木质素阶段。对两种工艺的纸浆质量、残留木质素和o级脱木质素效率进行了评估。氧脱木质素阶段在固定条件下进行，并根据kappa数进行评估，并根据己醛酸(HexA)的贡献进行校正。结果表明，不同硬木种的氧脱木质素效率不同。未漂白木质素中酚基含量与o期脱木质素效率呈高度相关，证实游离酚基是分子氧攻击的活性位点。对不同硬木种进行比较，发现HexA含量对o期脱木质素效率没有影响。

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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July 2018

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