Response of a Jacketed Exothermic Continuous Stirred-Tank Reactor to a Perturbation

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The governing equations for a jacketed exothermic continuous stirred-tank reactor (CSTR), where an exothermic first-order reaction is taking place, are given by:

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,

,

,

.

Here is the volume of the reactor; and are the inlet and outlet reactor flow rates, respectively; is the concentration inside the reactor and is the feed concentration to the reactor; and are the inlet temperatures to the reactor and cooling jacket, respectively; and are the temperatures in the jacket and reactor, respectively; is a heat transfer coefficient; is the area of the jacket available for heat exchange; is the flow rate of cooling water in the jacket; is the rate constant of the first-order reaction; is the heat of reaction; and are the densities of the reaction medium and the cooling liquid, respectively; and are the heat capacities of the reaction medium and the cooling liquid, respectively; and finally is the volume of the cooling jacket.

In addition, one has the following relations: (Arrhenius's law with the activation energy and the pre-exponential term), (a controller manipulates the flow rate of the liquid leaving the tank in proportion to the volume of liquid in the tank), and (a controller manipulates the flow rate of water to the cooling jacket in proportion to the CSTR temperature). A step disturbance in the inlet flow rate or feed concentration is applied at . This Demonstration plots the concentration in the reactor versus time as well as the temperature in the CSTR (blue curve) and the cooling jacket (magenta curve). The volume of the liquid in the reactor can also be observed. All numerical values were taken from Luyben's book.

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Contributed by: Housam Binous (March 2011)
Open content licensed under CC BY-NC-SA


Snapshots


Details

W. L. Luyben, Process Modeling, Simulation and Control for Chemical Engineers, 2nd ed., New York: McGraw-Hill International Editions, 1996.



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