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Hydrothermal Depolymerization of Biorefinery Lignin-Rich Streams: Influence of Reaction Conditions and Catalytic Additives on the Organic Monomers Yields in Biocrude and Aqueous Phase

Author

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  • Stefano Dell’Orco

    (RE-CORD, Viale Kennedy 182, Scarperia e San Piero, 50038 Florence, Italy
    Department of Industrial Engineering, University of Florence, Viale Morgagni 40, 50135 Florence, Italy)

  • Edoardo Miliotti

    (RE-CORD, Viale Kennedy 182, Scarperia e San Piero, 50038 Florence, Italy)

  • Giulia Lotti

    (RE-CORD, Viale Kennedy 182, Scarperia e San Piero, 50038 Florence, Italy)

  • Andrea Maria Rizzo

    (RE-CORD, Viale Kennedy 182, Scarperia e San Piero, 50038 Florence, Italy)

  • Luca Rosi

    (RE-CORD, Viale Kennedy 182, Scarperia e San Piero, 50038 Florence, Italy
    Chemistry Department “Ugo Schiff”, University of Florence, Via della Lastruccia, Sesto Fiorentino, 3-13 50019 Florence, Italy)

  • David Chiaramonti

    (RE-CORD, Viale Kennedy 182, Scarperia e San Piero, 50038 Florence, Italy
    “Galileo Ferraris” Energy Department, Polytechnic of Turin, Corso Duca degli Abruzzi 24, I-10129 Torino, Italy)

Abstract

Hydrothermal depolymerization of lignin-rich streams (LRS) from lignocellulosic ethanol was successfully carried out in a lab-scale batch reactors unit. A partial depolymerization into oligomers and monomers was achieved using subcritical water as reaction medium. The influence of temperature (300–350–370 °C) and time (5–10 minutes) was investigated to identify the optimal condition on the monomers yields in the lighter biocrude (BC1) and aqueous phase (AP) fractions, focusing on specific phenolic classes as well as carboxylic acids and alcohols. The effect of base catalyzed reactions (2–4 wt. % of KOH) was compared to the control tests as well as to acid-catalyzed reactions obtained with a biphasic medium of supercritical carbon dioxide (sCO 2 ) and subcritical water. KOH addition resulted in enhanced overall depolymerization without showing a strong influence on the phenolic generation, whereas sCO 2 demonstrated higher phenolic selectivity even though no effect was observed on the overall products mass yields. In conclusion, a comparison between two different biocrude collection procedures was carried out in order to understand how the selected chemical extraction mode influences the distribution of compounds between BC1 and AP.

Suggested Citation

  • Stefano Dell’Orco & Edoardo Miliotti & Giulia Lotti & Andrea Maria Rizzo & Luca Rosi & David Chiaramonti, 2020. "Hydrothermal Depolymerization of Biorefinery Lignin-Rich Streams: Influence of Reaction Conditions and Catalytic Additives on the Organic Monomers Yields in Biocrude and Aqueous Phase," Energies, MDPI, vol. 13(5), pages 1-22, March.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:5:p:1241-:d:329733
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    References listed on IDEAS

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    1. Azadi, Pooya & Inderwildi, Oliver R. & Farnood, Ramin & King, David A., 2013. "Liquid fuels, hydrogen and chemicals from lignin: A critical review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 21(C), pages 506-523.
    2. Sara Restrepo-Valencia & Arnaldo Walter, 2019. "Techno-Economic Assessment of Bio-Energy with Carbon Capture and Storage Systems in a Typical Sugarcane Mill in Brazil," Energies, MDPI, vol. 12(6), pages 1-13, March.
    3. Toor, Saqib Sohail & Rosendahl, Lasse & Rudolf, Andreas, 2011. "Hydrothermal liquefaction of biomass: A review of subcritical water technologies," Energy, Elsevier, vol. 36(5), pages 2328-2342.
    4. Naik, S.N. & Goud, Vaibhav V. & Rout, Prasant K. & Dalai, Ajay K., 2010. "Production of first and second generation biofuels: A comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(2), pages 578-597, February.
    5. Patel, Rajesh N. & Bandyopadhyay, Santanu & Ganesh, Anuradda, 2011. "Extraction of cardanol and phenol from bio-oils obtained through vacuum pyrolysis of biomass using supercritical fluid extraction," Energy, Elsevier, vol. 36(3), pages 1535-1542.
    6. Edoardo Miliotti & Stefano Dell’Orco & Giulia Lotti & Andrea Maria Rizzo & Luca Rosi & David Chiaramonti, 2019. "Lignocellulosic Ethanol Biorefinery: Valorization of Lignin-Rich Stream through Hydrothermal Liquefaction," Energies, MDPI, vol. 12(4), pages 1-27, February.
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    Cited by:

    1. Edoardo Miliotti & Luca Rosi & Lorenzo Bettucci & Giulia Lotti & Andrea Maria Rizzo & David Chiaramonti, 2020. "Characterization of Chemically and Physically Activated Carbons from Lignocellulosic Ethanol Lignin-Rich Stream via Hydrothermal Carbonization and Slow Pyrolysis Pretreatment," Energies, MDPI, vol. 13(16), pages 1-17, August.
    2. David Chiaramonti & Andrea Kruse & Marco Klemm, 2020. "Special Issue “Hydrothermal Technology in Biomass Utilization & Conversion II”," Energies, MDPI, vol. 14(1), pages 1-2, December.

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