Additional Homework Problems

P8-33_B

The liquid-phase reactions



are carried out in a perfectly insulated CSTR. The desired reaction is first order in A and zero order in B, while the undesired reaction is zero order in A and first order in B. The feed rate is equimolar in A and B. Species A enters the reactor at a temperature of 100°C and species B enters at a temperature of 50°C. The operating temperature of the reactor is 400 K. The molar flow rate of A entering the reactor is 60 mol/min : C_PA = 20 cal/(mol K), C_PB = 30 cal/(mol K), C_PD = 50 cal/(mol K), and C_PU = 40 cal/(mol K).

1. What will be the exit molar flow rate of U and D from the reactor?
   
   
2. What is the CSTR reactor volume for the conditions specified above?
   
   
3. Is there a more effective way to maximize D? Explain. (Hint: Start with a mole balance on A. Outline your method before beginning any calculations).

[3rd Ed. P8-31]