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Subcritical liquefaction of lignocellulose for the production of bio-oils in ethanol/water system

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  • Wu, Xiao-Fei
  • Yin, Shuang-Shuang
  • Zhou, Qian
  • Li, Ming-Fei
  • Peng, Feng
  • Xiao, Xiao

Abstract

Lignocellulose (20–40 mesh) was converted into bio-oils in ethanol with different concentrations (0, 20%, 40%, 60%, 80%, and 100%). The products were separated to obtain solid residues, heavy and light oils, and they were comprehensively characterized with a series of both chemical and spectral methods. Results indicated that the addition of ethanol enhanced the penetration of solvent into the rigid structure of lignocellulose. The highest bio-oil yield of 36.62% was obtained when the lignocellulose was liquified with 60% ethanol. The higher heating value of heavy oil decreased whereas that of light oil increased when more ethanol was used. 1H NMR analysis revealed that the addition of ethanol resulted in a high proportion of alcohols, ethers and esters, together with less aldehydes in the heavy oil. Meanwhile, the proportions of aldehydes in the light oil decreased with the increase of ethanol concentration.

Suggested Citation

  • Wu, Xiao-Fei & Yin, Shuang-Shuang & Zhou, Qian & Li, Ming-Fei & Peng, Feng & Xiao, Xiao, 2019. "Subcritical liquefaction of lignocellulose for the production of bio-oils in ethanol/water system," Renewable Energy, Elsevier, vol. 136(C), pages 865-872.
    • Handle: RePEc:eee:renene:v:136:y:2019:i:c:p:865-872
    DOI: 10.1016/j.renene.2019.01.041
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    2. Du, Chongzhen & Yang, Tianhua & Li, Bingshuo & Cao, He & Liu, Zheng & Huang, Shengzhao, 2023. "Effect of alkali and alkaline earth metals on the liquefaction of lignocellulosic model compounds to prepare bio-oil in ethanol solvent," Energy, Elsevier, vol. 278(C).
    3. Biswas, Bijoy & Arun Kumar, Aishwarya & Bisht, Yashasvi & Krishna, Bhavya B. & Kumar, Jitendra & Bhaskar, Thallada, 2021. "Role of temperatures and solvents on hydrothermal liquefaction of Azolla filiculoides," Energy, Elsevier, vol. 217(C).
    4. Janakiraman, S. & Lakshmanan, T. & Raghu, P., 2021. "Experimental investigative analysis of ternary (diesel + biodiesel + bio-ethanol) fuel blended with metal-doped titanium oxide nanoadditives tested on a diesel engine," Energy, Elsevier, vol. 235(C).

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