The effect of different pre-treatments to improve delignification of eucalypt stumps in a biorefinery context

E. globulus stumps are recently considered as feedstock for pulp industries. Pre-treatments may improve delignification, increase pulp quality and promote other cellulosic applications. Five environmentally friendly pre-treatments were studied: liquid hot water (LHW), oxalic acid (OA), alkaline pero...

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Bibliographic Details
Published inBioresource technology reports Vol. 6; pp. 89 - 95
Main Authors Gominho, J., Costa, R., Lourenço, A., Neiva, D.M., Pereira, H.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.06.2019
Subjects
Biomass
Biorefinery
Bleaching
Delignification
Pre-treatments
Pulps
Pre-treatments
Delignification
Biorefinery
Biomass
Pulps
Bleaching
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Summary:E. globulus stumps are recently considered as feedstock for pulp industries. Pre-treatments may improve delignification, increase pulp quality and promote other cellulosic applications. Five environmentally friendly pre-treatments were studied: liquid hot water (LHW), oxalic acid (OA), alkaline peroxide (AHP), sodium xylenesulfonate (SXS) and iron (III) chloride (FeCl3). The pre-treatments presented different yields: 94.7% (LHW), 92.7% (OA), 79.0% (AHP), 74.8% (SXS) and 78.9% (FeCl3). The chemical composition and FTIR analysis, including infrared structural ratios, of the pre-treated solids showed changes in cell wall structure. OA, SXS and FeCl3 pre-treatments were more selective for hemicelluloses extraction. Mass loss and pulp yield occurred considerably with AHP (21.0%; 53.9%), SXS (25.2%; 46.0%) and FeCl3 (21.1%; 30.7%). The pre-treated material was delignified by the kraft process, bleached using an ECF sequence (D0E1D1E2D2), and the pulp properties were evaluated. LHW improved the pulp physical properties while OA, AHP and SXS showed potential for production of dissolving pulps. •Eucalyptus globulus stumps are a feedstock for pulping under a biorefinery context.•Five pre-treatments were assessed showing different solubilisation and selectivity.•LHW pre-treatment improves pulping and increases the pulp physical properties.•SXS and AHP pre-treatments are promising for dissolving pulps.•FeCl3 pre-treatment followed by delignification allow a large chemical fractionation.
ISSN:2589-014X
2589-014X
DOI:10.1016/j.biteb.2019.02.004