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    Thermal decomposition of pyrolytic lignin under inert conditions at low temperatures

    Access Status
    Fulltext not available
    Authors
    Chua, Yee Wen
    Yu, Yun
    Wu, Hongwei
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Chua, Y.W. and Yu, Y. and Wu, H. 2017. Thermal decomposition of pyrolytic lignin under inert conditions at low temperatures. Fuel. 200: pp. 70-75.
    Source Title
    Fuel
    DOI
    10.1016/j.fuel.2017.03.035
    Additional URLs
    http://www.sciencedirect.com/science/article/pii/S0016236117303113
    ISSN
    0016-2361
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/58624
    Collection
    • Curtin Research Publications
    Abstract

    Abstract A pyrolytic lignin, separated from the bio-oil generated from biomass fast pyrolysis bio-oil at 500 °C via cold-water extraction, was thermally decomposed in a drop-tube/fixed-bed reactor under inert conditions at 100–350 °C. It is found that the char yield of the pyrolytic lignin under such fast pyrolysis conditions decreases rapidly from ~82% at 100 °C to ~23% at 350 °C. The majority of the weight loss is contributed by the significant reduction in the fraction of light aromatic oligomers (i.e., the CH2Cl2-soluble fraction) retained in the pyrolytic lignin chars, with such reductions increasing with temperature. On the contrary, there is insignificant change in the fraction of heavy aromatic oligomers (i.e., the CH2Cl2-insoluble fraction) retained in the pyrolytic lignin chars during pyrolysis at such low temperatures. It is evident that there are strong interactions between the light and heavy aromatic oligomers during thermal decomposition of the pyrolytic lignin, leading to the observed additional char formation. The main reactions during thermal decomposition of the pyrolytic lignin are the release of aliphatic and small phenolic compounds (i.e., via demethylation and decarbonylation reactions), mainly due to the breaking of ether bonds in the pyrolytic lignin structure. The char structure becomes more aromatic as temperature increases, due to the enhanced polymerization reactions at high temperatures (>250 °C).

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