Transcription of Comparing Reactors - Johnson Group
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Comparing Reactors - Johnson Group
11 ChE 400- Reactive Process EngineeringChEChE400400--Reactive Process EngineeringReactive Process EngineeringComparing Reactors00 AXPFRAVF= 0 CSTRAVF= One of the most basic criteria of reactor selection is the reactor size necessary to achieve a desired conversion in a reaction. We saw above that these are: What would the corresponding expression be for a batch reactor?Instead of Comparing numerically the numbers for different cases, we can easily visualize the reactor volume in what is called 1/r-plots (or also Levenspiel-plots )..22 ChE 400- Reactive Process EngineeringChEChE400400--Reactive Process EngineeringReactive Process Engineering1/r-PlotsLet s look at the PFR first:00()AXAPFRAAdXVFrX = We need 1/r(X) -> let s first look at r(X)! negative 1storder: r (1-X)-11storder kinetics: r (1-X)2ndorder kinetics: r (1-X)2zero order kinetics: r f(X)rX1 or 1 or XXeqeqr-1X1 or 1 or XXeqeqinverse (1/r) plot:33 ChE 400- Reactive Process EngineeringChEChE400400--Reactive Process EngineeringReactive Process Engineering1/r - Plotsr-1 XXAX eqoperating pointpointfor CSTR operating linelinefor PFRr-1 XXAn > 0n < 0 Volume PFR ?
1 ChE 400 - Reactive Process Engineering ChE 400-Reactive Process Engineering Comparing Reactors 0 0 X A VF PFR =− A ∫ CSTR A0 VF=− One of the …
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