
39Introduction to Kinetics and Chemical Reactors
2.1.8 Multiple Reactions
Multiple reactions are broadly classied as ‘series reactions’ and ‘parallel reactions’. A
series reaction is a reaction in which a reactant A gets converted into a product C in two
steps with the formation of an intermediate product B.
ABC
In the case of a parallel reaction, the reactant A gets converted simultaneously into a
number of products, say B, C and D
A
k
1
k
3
k
2
C
Series–parallel reactions are reactions that are combinations of both series and parallel
reactions. For example
A
1
B
2
k
3
C
2.1.8.1 Series Reaction
Consider a series reaction
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