Review of Kinetic Models of Supercritical CO2 Extraction of Oilseeds

In this review, mass transfer models on supercritical carbon dioxide (SC-CO2) extraction of vegetable oil seeds are investigateded. Reviewed mechanisms of oil transport within the solid matrix include the desorption from the solid, the formation of a shrinking core of condensed oil in a non adsorbing porous matrix, and diffusion in a homogenous medium. Analyzed simplifications of a general mass transfer model include external control of mass transfer rates, internal control of mass transfer rates, consideration of a linear driving force, and steady state approximations, among others. More complex two stage models, and critical comparisons of some of the proposed models are also included.