Multiple Reaction Conversion Notes

Selectivity why che che 400 reactive process

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Unformatted text preview: he crucial quantity! selectivity Why? ChE ChE 400 - Reactive Process Engineering Selectivity: Complications… L11-5 L11- Selectivity: SB = N B − N B ,0 νB ⋅ νA N A − N A,0 Definition ambiguous if product formed from more than one reactant! Example: Andrussov process (HCN synthesis) (1) (2) (3) Conversions of methane and ammonia can be very different. Extent to which reaction proceeds via (2) or (3) rather than (1) will be different. Hence: SHCN,CH4 ≠ SHCN,NH3 Selectivity needs a reference point! Selectivity needs a reference point! ChE ChE 400 - Reactive Process Engineering Si: even more problems… L11-6 L11- Selectivity: SB = What if I don’t know the reaction equations (hence no νi!) ? (Often the case for very complex reactant mixtures, networks of many parallel and series reactions!) (Simplified) Example: Methane Coupling 2 CH4 + 1/2 O2 <=> C2H6 + H2O CH4 + 2 O2 => CO2 + 2 H2O (1) (2) Assume equal amounts of methane rea...
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