Isothermal Plug Flow Reactor with Recycle
A first-order reaction is carried out in an isothermal plug flow reactor (PFR) with recycle. The fresh feed concentration (Cf = 0.2 mol/L) and volumetric flow rate are known. Use sliders to change the recycle ratio and the PFR volume. The correct reactant exit concentration (Ce) is obtained iteratively: the reactor feed concentration (C0) is guessed with the slider, and the PFR mass balance is then solved to determine Cf. A mass balance around the mixing point before the PFR yields the calculated C0. Change the C0 value using the slider until the calculated Cf (the black arrow on the left) equals 0.2 mol/L (the center of the green circle). The graph on the right plots the reactant concentration down the PFR using the guessed C0 value. For larger values of the recycle ratio, the PFR with recycle behaves like a continuous stirred-tank reactor (CSTR).
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This simulation was made at the University of Colorado Boulder, Department of Chemical and Biological Engineering. Author: Rachael L. Baumann
View the source code for this simulation