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Unformatted text preview: Lecture18 Thursday 3/13/08 Solution to Tuesdays Inclass Problem . User Friendly Energy Balance Derivations Adiabatic (Tuesday’s lecture) . Heat Exchange Constant Ta . Heat Exchange Variable Ta Cocurrent . Heat Exchange Variable Ta Counter Current Adiabatic Operation Elementary liquid phase reaction carried out in a CSTR The feed consists of both inerts I and Species A with the ratio of inerts to the species A being 2 to 1. (a) Assuming the reaction is irreversible, A → B, (K C = 0) what reactor volume is necessary to achieve 80% conversion? (b) If the exiting temperature to the reactor is 360K, what is the corresponding reactor volume? (c) Make a Levenspiel Plot and then determine the PFR reactor volume for 60% conversion and 95% conversion. Compare with the CSTR volumes at these conversions (d) Now assume the reaction is reversible, make a plot of the equilibrium conversion as a function of temperature between 290K and 400K. A B F A0 F I CSTR Adiabatic Mole Balance Rate Law Stoichiometry A B T = X = F A0 = 5 mol min T = 300K F I = 10 mol min ∆ H Rx =  20,000cal mol A (exothermic) V = F A0 X r A exit r A = k C A C B K C k = k 1 e E R 1 T 1 1 T K C = K C1 exp ∆ H Rx R 1 T 2 1 T C A = C A0 1 X ( 29 C B = C A0 X Energy Balance – Adiabatic, ∆ C P = 0 T = T +∆ H Rx ( 29 X ∑Θ i C P i = T +∆ H Rx ( 29 X C P A + Θ I C P I T = 300 +  20,000 ( 29 164 + 2 ( 29 18 ( 29 X = 300 + 20,000 164 + 36 X T = 300 + 100 X Irreversible for Parts (a) through (c)...
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This note was uploaded on 12/13/2011 for the course CHE 344 taught by Professor Savage during the Fall '08 term at University of Michigan.
 Fall '08
 Savage
 Reaction

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