Multiple Reaction Conversion Notes

# How is it different from a pfr for series reactions

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Unformatted text preview: a CSTR? (Same procedure: rate laws into design equation, substitute CB0 and CC0 by expressions in terms of CA0) CA = C A0 CB = C A0 k1τ CC = C A0 k1k2τ 2 So, what does this look like? How is it different from a PFR? •• For series reactions, there is always an optimum residence time For series reactions, there is always an optimum residence time to achieve aamaximum yield towards the intermediate product to achieve maximum yield towards the intermediate product •• For positive order kinetics, the optimum yield in the PFR is For positive order kinetics, the optimum yield in the PFR is always greater than that in aaCSTR always greater than that in CSTR How can we rationalize this? How about the BR? L11-16 L11- PFR v s CST R: Series Re action P FR v s CST R: Series Re action Maximum in CB -> optimum in optimum residence time! residence time How can I calculate the optimum? Look for dCB/dτ = 0! Do it for the PFR! 1 1 0.8 0.8 co c. [ .u.] connc....
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## This note was uploaded on 10/31/2013 for the course CHE E440 taught by Professor Baier during the Fall '13 term at Columbia.

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