Variation of Temperature and Concentration versus Residence Time in Adiabatic Reactors
Prepared by H. Binous and A. Bellagi

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  and temperature  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., where  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 [1]. 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.

Download the CDF file to view the simulation using the free Wolfram CDF player.