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Effective Mild Ethanol-Based Organosolv Pre-Treatment for the Selective Valorization of Polysaccharides and Lignin from Agricultural and Forestry Residues

Author

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  • Florbela Carvalheiro

    (LNEG-Laboratório Nacional de Energia e Geologia, Unidade de Bioenergia e Biorrefinarias, Estrada do Paço do Lumiar, 22, 1649-038 Lisboa, Portugal)

  • Luís C. Duarte

    (LNEG-Laboratório Nacional de Energia e Geologia, Unidade de Bioenergia e Biorrefinarias, Estrada do Paço do Lumiar, 22, 1649-038 Lisboa, Portugal)

  • Filipa Pires

    (LNEG-Laboratório Nacional de Energia e Geologia, Unidade de Bioenergia e Biorrefinarias, Estrada do Paço do Lumiar, 22, 1649-038 Lisboa, Portugal)

  • Vanmira Van-Dúnem

    (LNEG-Laboratório Nacional de Energia e Geologia, Unidade de Bioenergia e Biorrefinarias, Estrada do Paço do Lumiar, 22, 1649-038 Lisboa, Portugal)

  • Luís Sanfins

    (LNEG-Laboratório Nacional de Energia e Geologia, Unidade de Bioenergia e Biorrefinarias, Estrada do Paço do Lumiar, 22, 1649-038 Lisboa, Portugal)

  • Luísa B. Roseiro

    (LNEG-Laboratório Nacional de Energia e Geologia, Unidade de Bioenergia e Biorrefinarias, Estrada do Paço do Lumiar, 22, 1649-038 Lisboa, Portugal)

  • Francisco Gírio

    (LNEG-Laboratório Nacional de Energia e Geologia, Unidade de Bioenergia e Biorrefinarias, Estrada do Paço do Lumiar, 22, 1649-038 Lisboa, Portugal)

Abstract

Organosolv pre-treatments aiming to selectively remove and depolymerise lignin and hemicellulose and yield an easily digestible cellulose fraction are one of the potential options for industrial implementation within the biorefinery concept. However, the use of high temperatures and/or high catalyst concentrations is still hindering its wide adoption. In this work, mild temperature organosolv processes (140 °C) that were either non-catalysed or catalysed with sulphuric or acetic acid were compared to standard similar conditions using ethanol-based organosolv for both wheat straw (WS) and eucalyptus wood residues (ERs) as agricultural and forestry-derived model raw materials, respectively. The experimental results demonstrated that high cellulose purities could be obtained for the catalysed ethanol-based processing of the WS, which resulted in high saccharification yields (>80%), conversely to the non-catalysed process, which only reached values close to 70%. For eucalyptus residues (ERs), the pulp yields obtained were lower than the values obtained for the WS, suggesting that the ERs were a more reactive material. Cellulose purity was higher than that obtained for the corresponding treatment for the WS, with the highest cellulose purity being obtained for the ethanol-based process catalysed with sulphuric acid. Both materials presented high lignin yield recovery in the liquid stream.

Suggested Citation

  • Florbela Carvalheiro & Luís C. Duarte & Filipa Pires & Vanmira Van-Dúnem & Luís Sanfins & Luísa B. Roseiro & Francisco Gírio, 2022. "Effective Mild Ethanol-Based Organosolv Pre-Treatment for the Selective Valorization of Polysaccharides and Lignin from Agricultural and Forestry Residues," Energies, MDPI, vol. 15(15), pages 1-19, August.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:15:p:5654-:d:880076
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    References listed on IDEAS

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    1. Romaní, Aloia & Ruiz, Héctor A. & Teixeira, José A. & Domingues, Lucília, 2016. "Valorization of Eucalyptus wood by glycerol-organosolv pretreatment within the biorefinery concept: An integrated and intensified approach," Renewable Energy, Elsevier, vol. 95(C), pages 1-9.
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    Cited by:

    1. Maria El Hage & Nicolas Louka & Sid-Ahmed Rezzoug & Thierry Maugard & Sophie Sablé & Mohamed Koubaa & Espérance Debs & Zoulikha Maache-Rezzoug, 2023. "Bioethanol Production from Woody Biomass: Recent Advances on the Effect of Pretreatments on the Bioconversion Process and Energy Yield Aspects," Energies, MDPI, vol. 16(13), pages 1-31, June.

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