Variation of Temperature and Concentration versus Residence Time for Adiabatic Reactors

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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).

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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.

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


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[1] L. D. Schmidt, The Engineering of Chemical Reactions, New York: Oxford University Press, 1998.



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