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E-curve and F-curve for the Tanks-in-Series Model of MacMullin and Weber

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The residence time distribution curve (RTD-curve or E-curve) is the response to a pulse experiment. On the other hand, the response to a step experiment is called the F-curve.

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This Demonstration plots both the E-curve and the F-curve for a number of tanks in series.

The E-curve and F-curve are given by the following relationships (MacMullin and Weber, 1935):

,

,

where is dimensionless time and is the number of tanks in series. For a single tank, the E-curve and the F-curve correspond to the mixed tank case, while when is very large, for example equal to 100, the E-curve and the F-curve correspond to the plug flow reactor case.

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

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R. B. MacMullin and M. Weber, "The Theory of Short-Circuiting in Continuous-Flow Mixing Vessels in Series and Kinetics of Chemical Reactions in Such Systems," Trans. AIChE, 31(2), 1935 pp. 409–458.

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