Multiple Reaction Conversion Notes

E the different xji che che 400 reactive process

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Unformatted text preview: ces) for B and C: B: CB= CA0 XA,1 C: CC= CA0 XA,2 A: CA= but also: CA= Everything else remains unchanged – we now simply have one more quantity to keep track of, i.e. the different Xji! ChE ChE 400 - Reactive Process Engineering Series Reactions: Selectivity L11-14 L11- A -> B -> C Very common: partial vs total oxidation reactions (Almost) all oxidation reactions follow a sequence of successively “deeper” oxidation. Example: Ethane oxidation C2H6 + ½ O2 -> C2H4 + H2O (oxidative dehydrogenation) C2H4 + O2 -> 2 CO + 2 H2 (syngas formation) CO + H2 + O2 -> CO2 + H2O (combustion) Let’s assume a PFR for A -> B -> C, with 1st order kinetics: rA = , rB = = Plugging this into the PFR design equation, we get: C A (τ ) = CC (τ ) = CB (τ ) = Check the derivation in the textbook (p. 160ff)! You should be able to derive this yourself. So, what does this look like? ChE ChE 400 - Reactive Process Engineering Series Reactions: CSTR L11-15 L11- What about the same series reaction in...
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