Non-Ideal CSTR with Dead Zone and Bypass

7 Non-Ideal CSTR with Dead Zone and Bypass 

The tracer material trapped in the dead zone of a CSTR is released slowly into the effluent stream and this is seen as a long tail in the E-curve. The tracer material, drawn into the bypass stream, short-circuits the active volume and appears in the effluent stream within a short span of time. This is seen as an extended peak near f = 0 in the E-curve. A mathematical model that accounts for both dead zone and bypass in a CSTR is presented in this section. Consider a CSTR of volume V through which a fluid flows at volumetric rate q. Out of 

E-curve for a non-ideal CSTR with dead zone and bypass. 

Schematic diagram of non-ideal CSTR with bypass and dead zone. 

Define 3 as the fraction of the total volume V occupied by the active zone 

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Non-ideal features such as dead zone and bypass seen in a CSTR occur as a result of improper fluid mixing in the reaction vessel. A typical E-curve for a non-ideal CSTR with dead zone and bypass is shown in Figure 3.67. 

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