# 2004 - semibatch reactor in which 150 ft 3 of a solution...

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ChE 442 FALL 2004 Midterm 1 Problem 1: A B B The above reaction is carried out in a CSTR operating at a steady state at a temperature of 300 K. The activation energy E is 28.7 kcal/mol. Suddenly the temperature is raised to 400 K. How long will the reactor take to reach 95% of the new steady state conversion. Additional Information: V = 100 L v 0 = 0.5 L/min k = 0.004 min -1

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Problem 2: The following reaction is carried out in a PFR. A enters the reactor at a molar flow rate of 2 mol/min and concentration of 1 mol/L. The reactor operates with a significant pressure drop. 1 2 2 2 k k A B B B The rate of reaction is given by : 2 1 ?? A A r k C - = - a) Complete the reaction rate equation. b) What are the units of k 1 and k e ? c) What weight of catalyst is necessary to achieve a conversion of 40%? Assume 1 X ε = Additional Information: k 1 =0.02 k e =1 ?? 0.002 α =
Problem 3: For the following reaction A B C B + + the reaction rate is given as A A B r kC C - = ; k =0.3 ft 3 /lbmol.min Species B acts as a catalyst for the reaction. The reaction takes place in a

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Unformatted text preview: semibatch reactor in which 150 ft 3 of a solution containing 3 lbmole/ft 3 of A is initially present. B is fed to the reactor in the form of a solution containing 0.3 lbmol/ ft 3 B at a volumetric flowrate of 10 ft 3 /min. Determine how many moles of C are present after 1 hr. Problem 4: 0.0 0.2 0.4 0.6 0.8 1.0 10 20 30 40 50 60 70 C A0 /-r A (min) Conversion, X The figure above shows C A0 /-r A versus X for an exothermic reaction, i.e., A B B carried out adiabatically. Configuration A Configuration B a) Consider the two reactor configurations shown above. The intermediate conversion is 0.4 and the final conversion is 0.8. Determine which configuration CSTR PFR X = 0.4 X=0.8 PFR CSTR X = 0.4 X=0.8 (A or B) will have minimum total reactor volume. Also calculate this minimum volume. b) What volume is necessary for a single CSTR to achieve 80% conversion?? c) Repeat part (b) for a PFR....
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## 2004 - semibatch reactor in which 150 ft 3 of a solution...

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