Exothermic Reactions in CFSTRs

Consider an exothermie iiTeversible reaetion with first order kineties in an adiabatie eontinuous flow stirred tank reaetor. It is possible to determine the stable operating temperatures and eonversions by eom-bining bodi die mass and energy balanee equadons. For die mass balanee equation at eonstant density and steady state eondition. 

In terms of tlie temperature, tlie Arrhenius equation k = kgexp(-E/RT), the conversion is expressed as 

The steady state energy balance for adiabatic operation is determined as follows  

For a known reactor and kinetics, and at a given feed temperature Tq, the intersection of the energy balance line with the S-shaped mass 

Fig ure 6-22. Temperature versus conversion for a first order irreversible reaction in an adiabatic continuous flow stirred tank reactor. 

Consider an exothermic irreversible reaction with first order kinetics in an adiabatic continuous flow stirred tank reactor. It is possible to determine the stable operating temperatures and conversions by combining both the mass and energy balance equations. For the mass balance equation at constant density and steady state condition, 

Introducing the fractional conversion, XA yields CAO - CA = CAOXA and the energy balance becomes 

---