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>α2· 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
For α1>α2, 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 ...