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Materials 2016, 9(6), 423;

Modeling of the Kinetics of Supercritical Fluid Extraction of Lipids from Microalgae with Emphasis on Extract Desorption

Institute of Chemical Process Fundamentals of the Czech Academy of Sciences, v. v. i., Prague 02101–02117, Czech Republic
Centro de Química Estrutural, Lisbon University, Lisboa 1649-004, Portugal
Bioenergy Unit, LNEG, Lisbon 1649-004, Portugal
Author to whom correspondence should be addressed.
Academic Editor: Carlos Manuel Silva
Received: 25 March 2016 / Revised: 3 May 2016 / Accepted: 17 May 2016 / Published: 27 May 2016
(This article belongs to the Special Issue Optimisation and Scale-Up of Supercritical Fluid Extraction Processes)
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Microalgae contain valuable biologically active lipophilic substances such as omega-3 fatty acids and carotenoids. In contrast to the recovery of vegetable oils from seeds, where the extraction with supercritical CO2 is used as a mild and selective method, economically viable application of this method on similarly soluble oils from microalgae requires, in most cases, much higher pressure. This paper presents and verifies hypothesis that this difference is caused by high adsorption capacity of microalgae. Under the pressures usually applied in supercritical fluid extraction from plants, microalgae bind a large fraction of the extracted oil, while under extremely high CO2 pressures their adsorption capacity diminishes and the extraction rate depends on oil solubility in supercritical CO2. A mathematical model for the extraction from microalgae was derived and applied to literature data on the extraction kinetics in order to determine model parameters. View Full-Text
Keywords: microalgae; supercritical extraction; oil; kinetics; modeling microalgae; supercritical extraction; oil; kinetics; modeling

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Sovová, H.; Nobre, B.P.; Palavra, A. Modeling of the Kinetics of Supercritical Fluid Extraction of Lipids from Microalgae with Emphasis on Extract Desorption. Materials 2016, 9, 423.

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