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Unformatted text preview: ChE 101 2012 Problem Set 3 Read Schmidt Chapter 3 1. Find the minimum number of CSTRs connected in series to give an outlet conversion within 5 percent of that achieved in a PFR of equal total volume for: (a) first-order irreversible reaction of A to form B, k PFR = 1 (b) second-order irreversible reaction of A to form B, k c A, PFR = 1 2. The autocatalytic reaction of A to form Q is one that accelerates with conversion. An example of this is shown below: A + Q k GGGGGA 2 Q However, the rate decreases at high conversion due to the depletion of reactant A. The liquid feed to the reactor contains 1 M of A and 0.1 M of Q. (a) Show a 1 /r plot for this system as a function of the conversion of A. (b) To reach 50 percent conversion of A in the smallest reactor volume, would you use a PFR or a CSTR? Support your answer with graphical analysis of the 1 /r plot as well as with numerical calculations. (c) To reach 95 percent conversion of A in the smallest reactor volume, would you use a PFR or a CSTR? Support your answer with graphical analysis of the 1PFR or a CSTR?...
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- Winter '11