This paper deals with a physical model for the extraction of PAH perylene from spiked silt by supercritical CO2 based on numerous extraction experiments attained from a pilot plant. The solubility of perylene in dense CO2 is calculated by a HSVDW-model and the ternary equilibrium of soil, perylene, and CO2 is described by BET-isotherms, keeping in mind that adsorption phenomena mainly influence the extraction time of the process. Due to the dominant effect of PAH-adsorption on the soil, the extraction time is shortened by increasing temperature while the pressure must be optimized for each mass flow and temperature, respectively.