Solubility Characteristics and Selective Extraction of Jatropha Oil by Super- and Subcritical CO₂ Extraction

  • Tsuchiya Yooko
    Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry
  • Sako Takeshi
    Department of Materials Science and Chemical Engineering, Faculty of Engineering, Shizuoka University
  • Okajima Idzumi
    Department of Materials Science and Chemical Engineering, Faculty of Engineering, Shizuoka University
  • Yamamoto Akira
    Department of Materials Science and Chemical Engineering, Faculty of Engineering, Shizuoka University

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  • Solubility Characteristics and Selective Extraction of <i>Jatropha</i> Oil by Super- and Subcritical CO<sub>2</sub> Extraction

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With the aim of promoting bio-fuel production technologies, particularly those using bio-oil as a fuel for thermal power generation, we have developed a technique for bio-fuel extraction from Jatropha. The selective extraction of triglycerides from Jatropha seeds (a mixture of moisture, free fatty acids, and phosphorus) is required for developing new less-costly processes that avoid the oil refining treatment typically used in conventional technologies. The solubilities of Jatropha oil in super- and subcritical CO2 were measured, and the potential of CO2 to selectively extract triglycerides from Jatropha seeds by controlling the extraction time was revealed. The Jatropha oil extraction experiments were carried out under both super- and subcritical CO2 conditions using a flow-type apparatus. The amounts of Jatropha oil extracted by supercritical CO2from 35 to 50°C were a little bit larger than the amount by subcritical CO2 (25°C). Judging from the experimental data of the composition of the extract, subcritical CO2 has a potential to extract triglycerides from Jatropha seeds selectively by controlling the extraction time.

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