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R9.5 Adiabatic Operation of Batch Reactors

 

    For adiabatic operationimage 09eq4.gifand when the work done by the stirrer can be neglectedimage 09eq5.gifEquation (9-12) can be written as  
       
   

image 09eq6.gif

(9-13)
       
    whereimage 09eq7.gifAn analytical solution relating X and T can be found for the case of constant or mean heat capacity. Combining Equations (2-6) and (9-13) yields  
       
   

image 09eq8.gif

(9-15)
     
    multiplying by dt, separating variables and integrating between the initial conditions, X = 0 and T =T0, and later conditions X =X and T =T, yields  
       
   

image 09eq9.gif

 
       
    Taking the antilog, we have  
       
   
image 09eq10.gif
 
       
    solving for X yields  
       
   
image 09eq11.gif
 
       
    Then  
       
   
image 09eq12.gif
(9-16)
       
    This form is the same as the equation relating X and T derived for flow reactors. Rearranging yields  
       

Temperature
conversion
relationship for
an adiabatic batch
reactor

 
image 09eq13.gif
(9-17)