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Reactivity of syringyl and guaiacyl lignin units and delignification kinetics in the kraft pulping of Eucalyptus globulus wood using Py-GC–MS/FID
- Source :
- Repositório Científico de Acesso Aberto de Portugal, Repositório Científico de Acesso Aberto de Portugal (RCAAP), instacron:RCAAP
- Publication Year :
- 2012
- Publisher :
- Elsevier BV, 2012.
-
Abstract
- 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 °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%.
- Subjects :
- Paper
Environmental Engineering
Kinetics
Residual lignin
Bioengineering
engineering.material
S/G Ratio
Lignin
Gas Chromatography-Mass Spectrometry
chemistry.chemical_compound
Lignin Composition
Eucalyptus Globulus
Waste Management and Disposal
Flame Ionization
Eucalyptus
biology
Renewable Energy, Sustainability and the Environment
Pulp (paper)
Temperature
General Medicine
biology.organism_classification
Pulp and paper industry
Wood
Delignification
Models, Chemical
chemistry
Kraft process
Eucalyptus globulus
engineering
Gas chromatography–mass spectrometry
Pyrolysis
Subjects
Details
- ISSN :
- 09608524
- Volume :
- 123
- Database :
- OpenAIRE
- Journal :
- Bioresource Technology
- Accession number :
- edsair.doi.dedup.....09b8f8b64d2caab2194c74b82caffa51