Abstract
Abstract The kinetics of the supercritical fluid extraction of carotenoids from microalgae has been studied. The solvent systems used were supercritical carbon dioxide and CO 2 + 5% ethanol as a cosolvent. A penetration model developed by other authors was applied that, due to the spherical form of the cellular microalgae, was based on the application of the mass balance to a spherical particle. The fit of the model is satisfactory and it was able to predict in a reasonable way the extraction yield of the process. The comparison between experimental and calculated data provided a value for the internal diffusion coefficient and this allowed an analysis of the influence of the different variables in the extraction process.
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