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Computation of the Volume of a CSTR and a PFR

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A harmful industrial organic compound, A, found in waste water, is transformed using an enzyme into a harmless product. Laboratory tests using a specific quantity of the enzyme in a mixed flow reactor give the following data:

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Here is the residence time in minutes and and are the inlet and outlet concentration of A in mmol/.

This Demonstration computes the reactor volume (expressed in ) needed to treat of this waste water for in order to achieve a user-specified value of the conversion . Two types of reactor are considered: PFR (plug flow reactor) and CSTR (continuous stirred-tank reactor). The reactor residence time, in minutes, is equal to the shaded area shown in the figure.

For a PFR:

For a CSTR:

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

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O. Levenspiel, Chemical Reaction Engineering, New York: John Wiley & Sons, 1999.

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