Abstract

STEFFANI, E.; ATTI-SANTOS, A. C.; ATTI-SERAFINI, L.  and  PINTO, L. T.. Extraction of ho-sho (Cinnamomum camphora nees and eberm var. Linaloolifera fujita) essential oil with supercritical CO₂: experiments and modeling. Braz. J. Chem. Eng. [online]. 2006, vol.23, n.2, pp. 259-266. ISSN 0104-6632.  http://dx.doi.org/10.1590/S0104-66322006000200014.

Supercritical CO₂ extraction of essential oil from the leaves of a variety of camphor tree known as Ho-Sho was studied. Experiments were carried out within the following ranges: CO₂ flow rate (1 - 4 mL/min); pressure (80 - 100 bar); temperature (40 - 60 ºC) and particle size (0.37 - 1.0 mm). The equipment used was an HP 8670 T extractor module with an extraction cell volume of 7 mL. Two mathematical models of the process were proposed. Model 1 was a modified version of the traditional shrinking core model with effective diffusivity and the external mass transfer coefficient as the fitting parameters. Model 2 used an additional kinetic parameter based on an Arrhenius-like expression. Both models took into account the cell pressurization step. The best fit between the extraction model curves and the experimental data was obtained using model 2.

Keywords : Supercritical extraction; Essential oil; Ho-sho; Mathematical modeling.