Question

Problem 1 Consider the liquid phase reaction A à products accelerated by a homogeneous catalyst dissolved in the solution. The observed rate data follows the form: -r=k1Ca/(1+K2Ca+K3(Ca^2))

You are asked to recommend either a steady CSTR or steady PFR. Your reactor must reduce the feed composition of 0.6 mole/liter down to 0.3 mole/liter in the effluent. • Create a plot of ordinate 1/(-rA) vs. abscissa CA. Use the data below. Use sufficient resolution in your plot to get a smooth curve. Plot over the CA range: 0.1 to 0.7 • Show the operating point(s) for both the CSTR and the PFR. Make sure you show all the required theory. • Show graphically the areas representing space-times τ for the CSTR and the PFR. • Calculate (analytically) each of these τ values. Data: k1 = 7/min k2 = 2 liters/mole k3 = 25 liter2 /mole2

Problem 2 Repeat Problem #1 for a batch reactor. Calculate (analytically) the residence time t needed for the required conversion. Make sure you show all the required theory.

Problem 3 Repeat Problem #1 where your reactor must reduce the feed composition of 0.6 mole/liter down to 0.05 mole/liter in the effluent. Compare and contrast these results from those of Problem 1.

Problem 4 At what outlet concentration CA would the τCSTR = τPFR? Show your work analytically; that is, derive this outlet CA? What is the corresponding τ?

Answer 1