Consider the first-order chemical reaction
taking place either in an adiabatic CSTR (continuous stirred tank reactor) or an adiabatic PFTR (plug-flow tubular reactor).
This Demonstration plots the concentration
versus the residence time
for both types of adiabatic reactors. You can set the value of the initial concentration,
, as well as the value of parameter
is the heat of reaction,
is the fluid density, and
is the fluid heat capacity. Values of the other relevant parameters such as activation energy, pre-exponential factor, and initial temperature are taken from . An interesting feature of the adiabatic CSTR is that, for a range of the residence time values, one can find up to three solutions. A stability analysis can show that only two of the solutions are stable. Steady-state multiplicity can be shown to be physically real.