Use molar flow rates and concentrations; DO NOT use conversion!
There are 4 classes of Multiple Reactions.
1. Parallel Reactions

2. Series Reactions

3. Complex Reactions: Series and Parallel aspects combined

4. Independent Reactions

Independent reactions typically occur in the catalytic cracking of crude oil to form gasoline.

What type of reaction is taking place?

Selectivity and Yield

There are two types of selectivity and yield: Instantaneous and Overall.

	Instantaneous	Overall
Selectivity
Yield
Example:	desired product , rD=k1CA2CB                     undesired product , rU=k2CACB                         To maximize the selectivity of D with respect to U run at high concentration of A and use PFR