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<p>Rice husk, a by-product of rice mills, is abundantly available at low cost and holds the potential for bio-oil and biogenic silica production. This research explores the direct thermal liquefaction of rice husk using guaiacol as a solvent at temperatures of 240 ℃, 250 ℃, and 260 ℃, with reaction times of up to 120&#xa0;min. The results showed that liquid yields increased with time and temperature, reaching a maximum of ~ 90 wt.% (ash-free basis). These findings enabled the creation of a reaction network for the direct thermal liquefaction of rice husk, which was further used to develop a quantitative kinetic model, with parameters estimated from experimental data at different temperatures and times. The kinetic model revealed that at 240 ℃, the liquid formation pathway from rice husk was about seventy times faster than the gas formation pathway, decreasing to fourteen times faster at 260 ℃, indicating that the gas formation pathway is more enhanced with increasing temperature compared to the route for liquid formation. The activation energies for the liquid and gas formation pathways from rice husk were determined to be 112 and 295&#xa0;kJ/mol, respectively. This study provides valuable insights for optimizing process parameters to maximize bio-oil yield.</p>

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Kinetic modeling and bio-oil production from rice husk through direct thermal liquefaction using guaiacol and water as solvent

  • 期刊论文

  • 发表日期：

    2025年1月29日

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  • Ankit Chauhan,
  • Manvendra Singh,
  • Shushil Kumar,
  • Sivamohan N. Reddy

摘要

Rice husk, a by-product of rice mills, is abundantly available at low cost and holds the potential for bio-oil and biogenic silica production. This research explores the direct thermal liquefaction of rice husk using guaiacol as a solvent at temperatures of 240 ℃, 250 ℃, and 260 ℃, with reaction times of up to 120 min. The results showed that liquid yields increased with time and temperature, reaching a maximum of ~ 90 wt.% (ash-free basis). These findings enabled the creation of a reaction network for the direct thermal liquefaction of rice husk, which was further used to develop a quantitative kinetic model, with parameters estimated from experimental data at different temperatures and times. The kinetic model revealed that at 240 ℃, the liquid formation pathway from rice husk was about seventy times faster than the gas formation pathway, decreasing to fourteen times faster at 260 ℃, indicating that the gas formation pathway is more enhanced with increasing temperature compared to the route for liquid formation. The activation energies for the liquid and gas formation pathways from rice husk were determined to be 112 and 295 kJ/mol, respectively. This study provides valuable insights for optimizing process parameters to maximize bio-oil yield.