Abstrret
-Plug flow as well as axml chspersion dynamic models for counter-flow extractwe reactors are formulated and solved to mvesmte the frequency response charactenstuzs of such reactors The reactions considered are taken to he either mfimtely fast, takmg place at the interface between the two phases or wlthm a thin film m one of the phases. or slow takmg place in the bulk of one of the phases The results demonstrate the effect of the kinetic regune as well as axial dispersion (Peclet number) of the continuous phase on the dynamic behaviour of the two phase reactor For the plug fiow case (Pe+m) it IS shown that for some Input-output relations the kmetlc regime &ects the funcDonal forms of the transfer functions The complex transfer functions are approxunated, usmg simple fittmg techniques. to simpler ones suitable for the design of the reactor's control loops For the axial dispersion case the results show that the continuous phase Peclet number affects the frequency response of the reactor In a complicated manner @ving rise, for some input-output relations and small values of the Peclet number, to complex oscdlatlons In both amplitude ratlo and phase angle