Abstract

RUETSCH, L.; DAGHERO, J.  and  MATTEA, M.. Supercritical extraction of solid matrices. Model formulation and experiments. Lat. Am. appl. res. [online]. 2003, vol.33, n.2, pp.103-107. ISSN 0327-0793.

Nowadays, supercritical extraction of solid matrices is used frequently to obtain valuable substances especially by food and pharmaceutical industries. Most often, solid particles are arranged in a fixed bed configuration and the supercritical fluid flows through the bed extracting the desired solute. In this study, a mathematical model is set to simulate this process. The influence on the extraction yield of processing variables such as temperature, pressure and flow velocity as well as some process parameters like particle size, void fraction and bed height are predicted by the model. This model was used to simulate the extraction of essential oil from clove buds with supercritical CO₂. Experiments were carried out at different pressures (90-120 bar) at a fixed temperature and CO₂ flow. A good agreement between experimental and theoretical results was obtained.

Keywords : Supercritical Extraction; Mathematical Modeling; Solid Matrix.

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