Journal article Open Access

Lignocellulosic Ethanol Biorefinery: Valorization of Lignin-Rich Stream through Hydrothermal Liquefaction

Miliotti, Edoardo; Dell'Orco, Stefano; Lotti, Giulia; Rizzo, Andrea Maria; Rosi, Luca; Chiaramonti, David

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<oai_dc:dc xmlns:dc="" xmlns:oai_dc="" xmlns:xsi="" xsi:schemaLocation="">
  <dc:creator>Miliotti, Edoardo</dc:creator>
  <dc:creator>Dell'Orco, Stefano</dc:creator>
  <dc:creator>Lotti, Giulia</dc:creator>
  <dc:creator>Rizzo, Andrea Maria</dc:creator>
  <dc:creator>Rosi, Luca</dc:creator>
  <dc:creator>Chiaramonti, David</dc:creator>
  <dc:description>Hydrothermal liquefaction of lignin-rich stream from lignocellulosic ethanol production at an industrial scale was carried out in a custom-made batch test bench. Light and heavy fractions of the HTL biocrude were collected following an ad-hoc developed two-steps solvent extraction method. A full factorial design of experiment was performed, investigating the influence of temperature, time and biomass-to-water mass ratio (B/W) on product yields, biocrude elemental composition, molecular weight and carbon balance. Total biocrude yields ranged from 39.8% to 65.7% w/w. The Temperature was the main influencing parameter as regards the distribution between the light and heavy fractions of the produced biocrude: the highest amount of heavy biocrude was recovered at 300 °C, while at 350 and 370 °C the yield of the light fraction increased, reaching 41.7% w/w at 370 °C. Instead, the B/W ratio did not have a significant effect on light and heavy biocrude yields. Feedstock carbon content was mainly recovered in the biocrude (up to 77.6% w/w). The distribution between the light and heavy fractions followed the same trend as the yields. The typical aromatic structure of the lignin-rich stream was also observed in the biocrudes, indicating that mainly hydrolysis depolymerization occurred. The weight-average molecular weight of the total biocrude was strictly related to the process temperature, decreasing from 1146 at 300 °C to 565 g mol−1 at 370 °C.</dc:description>
  <dc:source>Energies 12(4)</dc:source>
  <dc:subject>lignin; biorefinery; hydrothermal liquefaction; biocrude; depolymerization</dc:subject>
  <dc:title>Lignocellulosic Ethanol Biorefinery: Valorization of Lignin-Rich Stream through Hydrothermal Liquefaction</dc:title>
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