Open raceway pond에서 배양된 Nannochloropsis oceanica로부터 오일 추출 및 SO42-/HZSM-5를 이용한 바이오디젤 전환
Oil Extraction from Nannochloropsis oceanica Cultured in an Open Raceway Pond and Biodiesel Conversion Using SO42-/HZSM-5
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In this study, microalgal oil was extracted from Nannochloropsis oceanica cultured in an open raceway pond andconverted into biodiesel using a solid acid catalyst. Microalgal oil was extracted from two types of microalgae with and withoutnitrogen starvation using the KOH-solvent extraction method and the fatty acid content and oil extraction yield from each microalgaewere compared. The fatty acid content of N. oceanica was 184.8 mg/g cell under basic conditions, and the oil content increased to340.1 mg/g under nitrogen starvation conditions. Oil extraction yields were 90.8 and 95.4% in the first extraction, and increased to97.5 and 98.8% after the second extraction. Microalgal oil extracted by KOH-solvent extraction was yellow in color and had reducedviscosity due to chlorophyll removal. In biodiesel conversion using the catalyst SO42-/HZSM-5, solvent-extracted oil showed a FAMEcontent of 4.8%, while KOH-solvent-extracted oil showed a FAME content of 90.4%. Solid acid catalyst application has been madeeasier by removal of chlorophyll from microalgal oil. The FAME content increased to 96.6% upon distillation, and the oxidationstability increased to 11.07 h with addition of rapeseed biodiesel and 1,000 ppm butylated hydroxyanisole.
Abstract
In this study, microalgal oil was extracted from Nannochloropsis oceanica cultured in an open raceway pond andconverted into biodiesel using a solid acid catalyst. Microalgal oil was extracted from two types of microalgae with and withoutnitrogen starvation using the KOH-solvent extraction method and the fatty acid content and oil extraction yield from each microalgaewere compared. The fatty acid content of N. oceanica was 184.8 mg/g cell under basic conditions, and the oil content increased to340.1 mg/g under nitrogen starvation conditions. Oil extraction yields were 90.8 and 95.4% in the first extraction, and increased to97.5 and 98.8% after the second extraction. Microalgal oil extracted by KOH-solvent extraction was yellow in color and had reducedviscosity due to chlorophyll removal. In biodiesel conversion using the catalyst SO42-/HZSM-5, solvent-extracted oil showed a FAMEcontent of 4.8%, while KOH-solvent-extracted oil showed a FAME content of 90.4%. Solid acid catalyst application has been madeeasier by removal of chlorophyll from microalgal oil. The FAME content increased to 96.6% upon distillation, and the oxidationstability increased to 11.07 h with addition of rapeseed biodiesel and 1,000 ppm butylated hydroxyanisole.
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