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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{
  "DOI": "10.3390/en12040723", 
  "container_title": "Energies", 
  "title": "Lignocellulosic Ethanol Biorefinery: Valorization of Lignin-Rich Stream through Hydrothermal Liquefaction", 
  "issued": {
    "date-parts": [
      [
        2019, 
        2, 
        22
      ]
    ]
  }, 
  "abstract": "<p>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 &deg;C, while at 350 and 370 &deg;C the yield of the light fraction increased, reaching 41.7% w/w at 370 &deg;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 &deg;C to 565 g mol&minus;1 at 370 &deg;C.</p>", 
  "author": [
    {
      "family": "Miliotti, Edoardo"
    }, 
    {
      "family": "Dell'Orco, Stefano"
    }, 
    {
      "family": "Lotti, Giulia"
    }, 
    {
      "family": "Rizzo, Andrea Maria"
    }, 
    {
      "family": "Rosi, Luca"
    }, 
    {
      "family": "Chiaramonti, David"
    }
  ], 
  "volume": "12", 
  "type": "article-journal", 
  "issue": "4", 
  "id": "2633038"
}
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