Solutions to exercises reactors

l A gas phase reaction A + B— R is carried out in a CSTR and PFR separately at a rate of 100 mol/min where the temperature is constant at 150°C and the pressure is 10 atm. The reactant B is three times more than A in the feed reactor. The rate constant 

If the average residence time in the PFR is 3 min and assuming equal values of conversion on outputs of each reactor, find the volumes and molar flow for both reactors, compare them. 

The ratio between reactants, B/A = 3, indicates that there is a large dilution. Therefore, A is limiting. Since k is given in min , one can conclude that it is a first-order reaction, but with variable volume. Thus  

The value of the rate constant can be calculated at 150°C (reaction temperature), which is  

In the CSTR reactor, assuming the same conversion, we nse the equation  

---