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Homework+1

# Homework+1 - Chemical Engineering 142 Homework Set#1 100...

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Chemical Engineering 142 Homework Set #1 100 points total Due Wednesday, January 27, 2010 Problem 1 (30 points) A liquid phase reaction, 3A 2B + 4C, occurs in an isothermal flow reactor running at steady-state. The volumetric flow rate is constant at 4 L h -1 , and the entering molar flow rate of pure A is 20 mol h -1 . The reactor is to be designed such that 85% of the A fed is converted into products. For each of the assumed forms of the reaction rate, r A , below, calculate the reactor volume required for a (i) CSTR or (ii) PFR: (a) with k = 4 mol h -1 L -1 (b) with k = 0.3 mol -2 h -1 L 2 (c) r A = k C A with k = 0.1 mol 2 h -1 L -2 (d) If volume is the only parameter in the capital cost of the reactor, what type of reactor is optimal for the kinetics given in parts (a)-(c), and how much money will you save for each if the cost is \$1000/L? (e) Calculate the residence time, τ , for the PFR in part (b). Then, calculate the time required to obtain the same conversion as the PFR in a batch reactor of the same volume and same initial concentration. How do the two times compare?

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