Abstract

The adsorption process for the removal of terpens from citrus oil by supercritical carbon dioxide was studied. The separation of limonene and linalool, which are principal constituents of terpens and oxygenated compounds in orange oil, respectively, was carried out with silica gel adsorbent in the presence of supercritical carbon dioxide. Adsorption equilibrium constants obtained by a impulse response method decreased with the increase in the solvent density, where linalool was selectively adsorbed on silica gel. Breakthrough curves and desorption histories for a model mixture of limonene and linalool and raw orange oil indicated that the terpenless citrus oil was successfully obtained.

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