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    Ternary System of Pyrolytic Lignin, Mixed-Solvent and Water: Phase Diagram and Implications

    258819.pdf (3.788Mb)
    Access Status
    Open access
    Authors
    Li, M.
    Zhang, M.
    Yu, Yun
    Wu, Hongwei
    Date
    2018
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Li, M. and Zhang, M. and Yu, Y. and Wu, H. 2018. Ternary System of Pyrolytic Lignin, Mixed-Solvent and Water: Phase Diagram and Implications. Energy and Fuels. 32 (1): pp. 465-474.
    Source Title
    Energy and Fuels
    DOI
    10.1021/acs.energyfuels.7b02943
    ISSN
    0887-0624
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    Remarks

    Copyright © 2017 American Chemical Society

    URI
    http://hdl.handle.net/20.500.11937/60900
    Collection
    • Curtin Research Publications
    Abstract

    Bio-oil from biomass fast pyrolysis is considered as an important feedstock for the production of renewable fuels and green chemicals. Fast pyrolysis bio-oil generally contains water-soluble fraction, water-insoluble fraction (i.e., pyrolytic lignin, PL) and water in a single phase. However, phase separation can take place during bio-oil transport, storage and processing. In this study, a mixed solvent (MS) is developed based on the compositions of various fast pyrolysis bio-oils produced from a wide range of feedstocks and reactor systems. Experiments are then carried out to investigate the phase behaviour of the PL/MS/water ternary system. Several ternary phase diagrams are constructed for PL and its fractions, and the PL solubilities in various MS/water mixtures are also estimated. The PL solubility in the MS is high, i.e., ~112 g per 100 g of MS. In the PL/MS/water system, an increase in water content to ~17 wt % in the MS/water mixture leads to a slight increase in the PL solubility to a maximal value of ~118 g per 100 g of MS/water mixture, followed by a gradual decrease in the PL solubility when the water content further increases. It is found that the phase stability of the PL/MS/water system is strongly determined by the composition of the system. For example, the PL/MS/water system is always stable when the MS content is > 50 wt %, while the system is always phase separated when the PL content is > 54 wt %. A comparison of the results for various PL fractions indicates that the molecular weight of PL can affect the ternary phase diagram, with the PL of a lower molecular weight having a higher solubility in the same MS/water mixture. The presence of free sugar (i.e., levoglucosan, present in bio-oil as solute) also influences the ternary phase diagram of the PL/MS/system, but only at a low water content (i.e., < 20 wt %). The results suggest that such ternary diagrams may be potentially an important tool for predicting phase separation of bio-oil as results of changes in bio-oil chemistry in various processes (e.g., cold-water precipitation and ageing).

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