Reactors with two process streams in cocurrent flow

4 Reactors with two process streams in cocurrent flow 

For this case the two mass balances are both differential equations. We shall consider the simplest case, namely that both streams have a constant density and approach plug flow. The micro-mass balances are then 

The average reaction rate r is the average in the volume element dz. 

However, it is a function of the reactant concentrations that both vary with z. Let us assume further that this function is represented by eq. (7.40). 

The second equation in eq. (7.41) can be integrated to give the mass balance for a section of the reactor  

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