Plug Flow or Ideal Tubular Reactor PFR

Any disturbance in the inlet flow travels with the Hnear velocity u through the reactor. Therefore, a novel stationary axial concentration profile is reached after the space time t = V/Vg. 

After the introduction of the conversion for the key component Aj, the design equations for irreversible nth order reactions are readily found  

The reactor volume required to achieve a target conversion can be calculated by integration. 

For reactions with zero order (n = 0), the performance of CSTR and PFR are equal for any conversion. For the reactions with negative order, the transformation rate increases with decreasing reactant concentration and the performance of a CSTR will be higher compared to a PFR. 

If the density of the reaction mixture does not change throughout the reactor, the linear velocity of the reaction mixture remains constant and Equation 2.73 can then be transformed with dr = dziu to 

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