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Chapter 6: Isothermal Reactor Design: Molar Flow Rates
Selectivity and Yield:
| Instantaneous | Overall | |
| Selectivity |  |
 |
| Yield |  |
 |
| Example: |  |
desired product , rD=k1CA2CB |
 |
undesired product , rU=k2CACB2 | |
|
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To keep the selectivity of the desired products high
with respect to the undesired products carry out the reaction at high concentrations of A
and low concentrations of B. If the reactor is liquid phase, a high selectivity can easily
be achieved using a semibatch reactor in which B is few slowly to A. |
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