Influences of 2-ethylanthraquinone on lignin degradation in alkaline cooking of Eucalyptus pellita wood

IF 2.2 3区 农林科学 Q2 FORESTRY
Ke Luo, Taiki Nishimoto, Yasuyuki Matsushita
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Abstract

The impact of 2-ethylanthraquinone (2-EAQ) on alkaline cooking of Eucalyptus pellita wood was examined by analyzing pulp yield, kappa number, the structure and weight-averaged molecular weight (Mw) of dissolved lignin in black liquor and residual lignin in pulp (RL). During soda cooking under 23% of active alkaline (AA) condition, adding 0.06% 2-EAQ reduced the kappa number by 12 points compared to cooking without it. The addition of 0.06% 2-EAQ to kraft cooking increased pulp yield by about 4% at about 19 of kappa number compared to the no addition. The analysis of lignin structure by using semiquantitative heteronuclear single quantum correlation nuclear magnetic resonance (HSQC NMR) showed that the addition of 2-EAQ promoted β-ether cleavage during alkaline cooking and reduced peeling reaction of polysaccharides and prevention of the elimination of γ-OH of lignin to form enol ethers and stilbenes. Overall, the addition of 2-EAQ promoted the degradation of lignin to lower molecular weight compounds, with a more pronounced effect observed in soda cooking than in kraft cooking. Under optimal conditions, the delignification efficiency and pulp yield of soda-EAQ pulping were comparable to kraft cooking.
2- 乙基蒽醌对桉树木材碱煮木质素降解的影响
通过分析纸浆得率、卡帕数、黑液中溶解木质素的结构和重量平均分子量(Mw)以及纸浆中残留木质素(RL),研究了 2-乙基蒽醌(2-EAQ)对桉树木材碱蒸煮的影响。在 23% 活性碱(AA)条件下的苏打蒸煮过程中,添加 0.06% 2-EAQ 比不添加 2-EAQ 的蒸煮过程降低了 12 个 kappa 值。在牛皮纸蒸煮过程中添加 0.06% 的 2-EAQ 可使纸浆得率提高约 4%,与不添加相比,kappa 值降低约 19。利用半定量异核单量子相关核磁共振(HSQC NMR)对木质素结构进行的分析表明,添加 2-EAQ 可促进碱性蒸煮过程中的β-醚裂解,减少多糖的剥离反应,防止木质素中的γ-OH 消除形成烯醇醚和二苯乙烯。总之,添加 2-EAQ 可促进木质素降解为低分子量化合物,苏打蒸煮比牛皮纸蒸煮的效果更明显。在最佳条件下,苏打-EAQ 制浆的脱木素效率和纸浆产量与牛皮纸蒸煮相当。
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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来源期刊
Journal of Wood Science
Journal of Wood Science 工程技术-材料科学:纸与木材
CiteScore
5.40
自引率
10.30%
发文量
57
审稿时长
6 months
期刊介绍: The Journal of Wood Science is the official journal of the Japan Wood Research Society. This journal provides an international forum for the exchange of knowledge and the discussion of current issues in wood and its utilization. The journal publishes original articles on basic and applied research dealing with the science, technology, and engineering of wood, wood components, wood and wood-based products, and wood constructions. Articles concerned with pulp and paper, fiber resources from non-woody plants, wood-inhabiting insects and fungi, wood biomass, and environmental and ecological issues in forest products are also included. In addition to original articles, the journal publishes review articles on selected topics concerning wood science and related fields. The editors welcome the submission of manuscripts from any country.
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