Reactivity of syringyl and guaiacyl lignin units and delignification kinetics in the kraft pulping of Eucalyptus globulus wood using Py-GC-MS/FID

被引：39

作者：

Lourenco, Ana ^{[1
]}

Gominho, Jorge ^{[1
]}

Marques, Antonio Velez ^{[2
]}

Pereira, Helena ^{[1
]}

机构：

[1] Univ Tecn Lisboa, Sch Agr, Forest Res Ctr, P-1349017 Lisbon, Portugal

[2] Super Inst Engn Lisbon, Res Ctr Chem Engn & Biotechnol, P-1959007 Lisbon, Portugal

来源：

BIORESOURCE TECHNOLOGY | 2012年 / 123卷

关键词：

Eucalyptus globulus; Lignin composition; S/G ratio; Pyrolysis; Delignification; THERMAL-DEGRADATION PRODUCTS; RESIDUAL LIGNIN; PYROLYSIS; DISSOLUTION; HARDWOODS;

D O I：

10.1016/j.biortech.2012.07.092

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

Eucalyptus globulus sapwood and heartwood showed no differences in lignin content (23.0% vs. 23.7%) and composition: syringyl-lignin (17.9% vs. 18.0%) and guaiacyl-lignin (4.8% vs. 5.2%). Delignification kinetics of S- and G-units in heartwood and sapwood was investigated by Py-GC-MS/FID at 130, 150 and 170 degrees C and modeled as double first-order reactions. Reactivity differences between S and G-units were small during the main pulping phase and the higher reactivity of S over G units was better expressed in the later pulping stage. The residual lignin composition in pulps was different from wood or from samples in the initial delignification stages, with more G and H-units. S/G ratio ranged from 3 to 4.5 when pulp residual lignin was higher than 10%, decreasing rapidly to less than 1. The S/H was initially around 20 (until 15% residual lignin), decreasing to 4 when residual lignin was about 3%. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：296 / 302

页数：7

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