Equal size CFSTR in series

Introduction to Reactor Design Fundamentals for Ideal Systems 335 

Fig ure 5-25. Concentration profile through an N stage CFSTR system. 

A general equation ean be derived for the exit eoneentration as follows. 

Equation 5-202 is further expressed by uCAi-l — tl CAi + kCAi V where q = V/u. Equation 5-232 beeomes 

For N equal size mixed flow reaetors in series, a general equation 

A general equation can be derived for the exit concentration CAN as follows. 

Using the limit where N - , Equation 5-238 reduces to the plug flow equation 

For most types of kinetics, the stepwise changes in concentration results in a smaller average reaction rate than it would otherwise if the same feed materials were in a batch or plug (tubular) reactor. Therefore, to obtain the same output the volume of the reaction space must be larger, and in some instances much larger as in the case where only a single tank is used. By arranging several tanks in series the 

When the reactant ratio is unity (i.e., 0A= 1), the mass balance for component A in the continuous flow stirred tank reactor is 

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Figure 5-24. System of N equal size CFSTRs in series.

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