ChE 442 final exam fall 2000

ChE 442 final exam fall 2000 - University of Southern...

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University of Southern California Department of Chemical Engineering Chemical Reactors Analysis Chemical Reactors Analysis Course No. 442 Lecturer: Prof. T. T. Tsotsis Final Exam Fall 2000 Date: Dec.12, 2000 Exam Time: 2 hours Student Name: 1
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Student ID: 2
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Problem 1: Calculating the effectiveness factor Assume a flat-plate porous catalyst particle with thickness (diffusion-path length) L and of infinite extent in all other directions. Only one face is permeable to the diffusion reactant and product gases. The interior of the catalyst particle is poisoned, and as a result only the exterior layer with thickness L 1 is still active. Obtain an expression for η, the particle’s effectiveness factor based on the following assumptions: 1. The first order reaction A B occurs within the particle. 2. The particle is isothermal and at steady state. 3. The equimolar counter diffusion process of A and B obeys Fick’s law. Permeable face Active layer 3 L L1
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Problem 2: Determining the rate limiting process In the following schematic graphs, in each region tell which mechanism is rate limiting 4 Log(rea ction rate) Log( d P ) Slope= 1.5 to 1.8 Slope=1 Slope =0 Ln K(T) 1/T FT=10 mol/hr FT=5000 FT=1000
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This note was uploaded on 02/27/2008 for the course CHE 442 taught by Professor Tsotsis during the Fall '99 term at USC.

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ChE 442 final exam fall 2000 - University of Southern...

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