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Production of high-quality biofuel via ethanol liquefaction of pretreated natural microalgae

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  • Zhou, Yingdong
  • Chen, Yaguang
  • Li, Mingyu
  • Hu, Changwei

Abstract

The conversion of algal lipids to fatty acid alkyl esters is a promising way for the production of high-grade biofuel, due to the lower oxygen content of lipids than that of saccharides and proteins. Herein, a catalyst-free conversion process of natural microalgae cyanobacteria was developed for biodiesel production. The conversion involved two steps: (1) pretreatment of raw microalgae by Soxhlet extraction of lipids or hydrothermal treatment for extraction of saccharides and part of proteins at 200 °C; (2) liquefaction of raw and pretreated samples in sub/supercritical ethanol. In the first step, a maximum lipid yield of 6.5 wt% was extracted by Soxhlet extraction, while the hydrothermal treatment dissolved saccharides and a part of proteins. The composition of biocrude obtained from raw algae was complex, containing hydrocarbons, N-containing compounds, esters, fatty acids and other oxy-compounds. The biocrude from lipid extracted algae had a poor quality, from which the degradation of proteins was facilitated. Better yet, the extraction of saccharides and part of proteins by hydrothermal pretreatment simplified the composition (mainly fatty acid ethyl esters), reduced the nitrogen content (<4%) and improved the higher heating value (∼41 MJ kg−1) for biocrude.

Suggested Citation

  • Zhou, Yingdong & Chen, Yaguang & Li, Mingyu & Hu, Changwei, 2020. "Production of high-quality biofuel via ethanol liquefaction of pretreated natural microalgae," Renewable Energy, Elsevier, vol. 147(P1), pages 293-301.
    • Handle: RePEc:eee:renene:v:147:y:2020:i:p1:p:293-301
    DOI: 10.1016/j.renene.2019.08.136
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    References listed on IDEAS

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    3. Aljabri, Hareb & Das, Probir & Khan, Shoyeb & AbdulQuadir, Mohammad & Thaher, Mahmoud & Hawari, Alaa H. & Al-Shamary, Noora Mahmoud, 2022. "A study to investigate the energy recovery potential from different macromolecules of a low-lipid marine Tetraselmis sp. biomass through HTL process," Renewable Energy, Elsevier, vol. 189(C), pages 78-89.
    4. Huang, Yingying & Chen, Xuechu & Liu, Silu & Lu, Jinzhong & Shen, Yingshi & Li, Lei & Peng, Lin & Hong, Jingjie & Zhang, Qiuzhuo & Ostrovsky, Ilia, 2021. "Converting of nuisance cyanobacterial biomass to feedstock for bioethanol production by regulation of intracellular carbon flow: Killing two birds with one stone," Renewable and Sustainable Energy Reviews, Elsevier, vol. 149(C).
    5. Liu, Xu & Guo, Yang & Dasgupta, Anish & He, Haoran & Xu, Donghai & Guan, Qingqing, 2022. "Algal bio-oil refinery: A review of heterogeneously catalyzed denitrogenation and demetallization reactions for renewable process," Renewable Energy, Elsevier, vol. 183(C), pages 627-650.

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