A soxhlet extraction with n-hexane was done for comparison resulting in a maximum yield of oil of 18.3 goil/100 gdry spent coffee. Finally, a diffusional model that takes into account the properties of the substrate, the solute partition between the solid and the supercritical phase, and the mass transfer coefficient and axial dispersion in the fluid phase was applied to this system and a good agreement with experimental results was obtained.