Extraction lipids from chlorella vulgaris by supercritical CO 2 for biodiesel production
South African Journal of Chemical Engineering, ISSN: 1026-9185, Vol: 38, Page: 121-131
2021
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Article Description
This study investigated the impact of supercritical CO 2 lipid extraction method (SCCO 2 ) from Chlorella vulgaris microalgae for biodiesel production. In this research Chlorella vulgaris oil extracted using SCCO 2 and conventional solvent (n-hexane and ethanol). Extraction method was carried out using high pressure CO-solvent the extraction experiments were conducted at (12L: 12D) light/dark regime in 8 treatments, including: T1 (without any shock), T2 (acidity shock, pH:11), T3 (salinity shock, 1 molar NaCl), T4 (nutritional shock, depletion of nutrition), T5 (acidity+salinity shock), T6 (acidity+nutritional shock), T7 (salinity+nutritional shock) and T8 (acidity+salinity+nutritional shock). For each experiment used 10 g algae biomass. The results of growth performance indicated that different medium conditions such as salinity, acidity and nutritional terms with light and dark time shocks can enhanced the Chlorella vulgaris biomass productivity (SGR (0.17±0.00), biomass productivity (0.34±0.05) and CO 2 consumption rate (629.97±34.62). The major FAME profile of the obtained oils were (C16:0) palmitic, (C18:0) Stearic, (C22:1n9) ercucic, (C24:1n9) nervonic, (C22:6n3) DHA and (C20:3n3) eicosatrieonoic acids. The measured saponification value (SV) and iodine value (IV) showed no significant differences between the experimental samples ( P <0.05). The best results of cetane number (CN) and degree of unsaturation (DU) values was recorded in TL7 (5062.04±23.14) and TL8 (40.93±1.20), respectively. At least, fatty acids content and lipid extracted by SCCO 2 method under different pressure and temperature had the best results in 370 bar and 40 °C, while lowest restitution was seen in 200 bar and 40 °C, respectively. The results of this study illustrated that SCCO 2 method had positive impact on oil extraction from Chlorella vulgaris had desirable properties.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S1026918521000159; http://dx.doi.org/10.1016/j.sajce.2021.03.008; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85114024029&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S1026918521000159; https://api.elsevier.com/content/article/PII:S1026918521000159?httpAccept=text/xml; https://api.elsevier.com/content/article/PII:S1026918521000159?httpAccept=text/plain; https://dul.usage.elsevier.com/doi/; https://dx.doi.org/10.1016/j.sajce.2021.03.008
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