The efficiency of conventional countercurrent extraction-columns is relatively poor when using highly compressed gases, in particular as a consequence of substantial longitudinal mixing and film detachment, It is therefore obvious that the apparatus must be adapted to the supercritical conditions, A mixer-settler module, consisting of a regenerative pump and a fluid cyclone, which is more suitable than a countercurrent column for supercritical systems, was thus developed and dimensioned in this project. Murphree efficiencies of 81 and 96% were found for a module of this type on the synthetic test system alpha-tocopherol-alpha-tocopherol acetate-CO2. The same module was also suitable as an equilibrium apparatus for the requisite phase-equilibrium measurements.