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Open raceway pond에서 배양된 Nannochloropsis oceanica로부터 오일 추출 및 SO₄<SUP>2-</SUP>/HZSM-5를 이용한 바이오디젤 전환
박지연(Ji-Yeon Park),박주창(Joo Chang Park),김민철(Min-Cheol Kim),김덕근(Deog-Keun Kim),김형택(Hyung-Taek Kim),장호섭(Hoseob Chang),Jun Cheng(Jun Cheng),Weijuan Yang 한국신재생에너지학회 2023 신재생에너지 Vol.19 No.4
In this study, microalgal oil was extracted from Nannochloropsis oceanica cultured in an open raceway pond and converted into biodiesel using a solid acid catalyst. Microalgal oil was extracted from two types of microalgae with and without nitrogen starvation using the KOH-solvent extraction method and the fatty acid content and oil extraction yield from each microalgae were compared. The fatty acid content of N. oceanica was 184.8 mg/g cell under basic conditions, and the oil content increased to 340.1 mg/g under nitrogen starvation conditions. Oil extraction yields were 90.8 and 95.4% in the first extraction, and increased to 97.5 and 98.8% after the second extraction. Microalgal oil extracted by KOH-solvent extraction was yellow in color and had reduced viscosity due to chlorophyll removal. In biodiesel conversion using the catalyst SO₄<SUP>2-</SUP>/HZSM-5, solvent-extracted oil showed a FAME content of 4.8%, while KOH-solvent-extracted oil showed a FAME content of 90.4%. Solid acid catalyst application has been made easier by removal of chlorophyll from microalgal oil. The FAME content increased to 96.6% upon distillation, and the oxidation stability increased to 11.07 h with addition of rapeseed biodiesel and 1,000 ppm butylated hydroxyanisole.