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Solvent screening and process optimization for high shear-assisted lipid extraction from wet cake of Nannochloropsis sp

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  • Kwak, Minsoo
  • Kim, Donghyun
  • Kim, Sungwhan
  • Lee, Hansol
  • Chang, Yong Keun

Abstract

Microalgae are regarded as a promising feedstock for biofuels and value-added products but still suffer from an inefficient lipid extraction process. In the present study, a simple and energy-efficient extraction method is demonstrated to extract oil directly from the wet cake (260 g/L) of Nannochloropsis sp. with an assist from the high shear mixer (HSM). After the initial solvent screening, the composition of co-solvent and operating conditions were optimized according to lipid composition and extraction yield. The high shear-assisted extraction process was found to achieve 83% lipid extraction yield (94% for EPA) in 5 min and 95% yield (100% for EPA) in 30 min with minimal amounts of solvents (0.9 ml hexane, 0.39 ml ethanol, and 0.057 ml sulfuric acid for 1 g of wet cell) at 8000 rpm, 55 °C. In comparison with various two-step wet extraction methods, the HSM offers the most economical extraction in terms of specific energy consumption of 1.38 MJ/kg dry cell. Therefore, the HSM can be considered as an attractive alternative to conventional extraction methods, providing a new paradigm of wet extraction for microalgae.

Suggested Citation

  • Kwak, Minsoo & Kim, Donghyun & Kim, Sungwhan & Lee, Hansol & Chang, Yong Keun, 2020. "Solvent screening and process optimization for high shear-assisted lipid extraction from wet cake of Nannochloropsis sp," Renewable Energy, Elsevier, vol. 149(C), pages 1395-1405.
    • Handle: RePEc:eee:renene:v:149:y:2020:i:c:p:1395-1405
    DOI: 10.1016/j.renene.2019.10.133
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