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Essentials of Chemical Reaction Engineering by H. Scott Fogler

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8.3.2 Maximizing the Desired Product for One Reactant

In this section, we examine ways to maximize the instantaneous selectivity, SD/U, for different reaction orders of the desired and undesired products.

Case 1: α1 The reaction order of the desired product, α1, is greater than the reaction order of the undesired product, α2. Let a be a positive number that is the difference between these reaction orders (a > 0):

α1 – α2 = a

Then, upon substitution into Equation (8-10), we obtain

8-11

image

For α12, make CA as large as possible by using a PFR or Batch Reactor.

To make this ratio as large as possible, we want to carry out the reaction in a manner ...

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