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首页> 外文期刊>Journal of Wood Chemistry and Technology >Variation of Lignin Monomeric Composition During Kraft Pulping of Eucalyptus globulus Heartwood and Sapwood
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Variation of Lignin Monomeric Composition During Kraft Pulping of Eucalyptus globulus Heartwood and Sapwood

机译：桉树心材和边材牛皮纸制浆过程中木质素单体组成的变化

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摘要

Heartwood and sapwood samples from Eucalyptus globulus were characterized by Py-GC/MS and GC-FID in respect to composition and content of lignin. The pyrolysis lignin-derived compounds were assembled by groups: "syringol," "S-aldehydes," "S-ketones," "S-alcohols," and "C_(11)H_(12)O_3" (S-units); "guaiacol," "eugenol," "G-aldehydes," "G-ketones," "G-alcohols," and "others" (G-units); "phenol " and "H-aldehydes " (H-units). Heartwood and sapwood had similar lignin content in an extractive-free basis (23.7% and 23.0%, respectively) and in lignin composition (S-units, 76.0% vs. 76.3%; G-units, 22.0% vs. 21.0%; H-units, 1.9% vs. 2.7%; S/G ratio 3.5 and 3.6). The wood samples were kraft pulped under isothermal conditions at 130℃, 150℃ and 170℃ and several cooking times. Heartwood and sapwood behaved similarly. At 130℃ the delignification was slow with no significant selectivity in respect to lignin composition. At 150℃ and 170℃ the S-units were more susceptible to reaction and comparatively more removed, inducing a decrease of S/G ratio to 0.6. The main products to be extracted belong to "syringol" and "S-aldehydes," while the residual lignin in pulps was enriched in "guaiacol," "eugenol" (G-units), and "phenol" (H-units).
机译：通过木质素的组成和含量，通过Py-GC / MS和GC-FID对来自桉树的心材和边材样品进行了表征。热解木质素衍生的化合物按组组装：“丁香酚”，“ S-醛”，“ S-酮”，“ S-醇”和“ C_（11）H_（12）O_3”（S单元） ; “愈创木酚”，“丁香酚”，“ G-醛”，“ G-酮”，“ G-醇”和“其他”（G单元）； “苯酚”和“ H-醛”（H单元）。在无提取基础上，心材和边材的木质素含量相近（分别为23.7％和23.0％），在木质素组成方面（S单位为76.0％，而76.3％； G单位为22.0％，而21.0％； H） -单位，分别为1.9％和2.7％；信噪比分别为3.5和3.6）。将木材样品在130℃，150℃和170℃等温条件下牛皮纸制浆，并蒸煮几次。心材和边材的表现相似。在130℃下，木质素的去木质素作用缓慢，对木质素组成没有明显的选择性。在150℃和170℃下，S-单元更容易发生反应，并且相对被去除，导致S / G比降低至0.6。提取的主要产品为“丁香酚”和“ S-醛”，而纸浆中残留的木质素富含“愈创木酚”，“丁香酚”（G单元）和“苯酚”（H单元）。

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  • 来源
    《Journal of Wood Chemistry and Technology》 |2013年第1期|1-18|共18页
  • 作者

    ANA LOUREN?O; JORGE GOMINHO; ANTONIO VELEZ MARQUES; HELENA PEREIRA;

  • 作者单位

    Forest Research Center, School of Agriculture, Technical University of Lisbon, Tapada da Ajuda 1349 017, Lisbon, Portugal;

    Forest Research Center, School of Agriculture, Technical University of Lisbon, Lisbon, Portugal;

    Research Center for Chemical Engineering and Biotechnology, Superior Institute of Engineering of Lisbon, Lisbon, Portugal;

    Forest Research Center, School of Agriculture, Technical University of Lisbon, Lisbon, Portugal;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    eucalyptus globulus; heartwood; pyrolysis; S/G ratio; lignin composition;

    机译：桉树心材;热解信噪比木质素组成;

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