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P8-4 AA Consider the following system of gas-phase reactions: AXABAYrX=k1CA1/2rB=k2CArY=k3CA2k1=0.004(mol/dm3)1/2min1k2=0.3min1k3=0.25dm3/molmin B is the desired product, and X and Y are foul pollutants that are expensive

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P8-4 AA Consider the following system of gas-phase reactions: AXABAYrX=k1CA1/2rB=k2CArY=k3CA2k1=0.004(mol/dm3)1/2min1k2=0.3min1k3=0.25dm3/molmin B is the desired product, and X and Y are foul pollutants that are expensive to get rid of. The specific reaction rates are at 27C. The reaction system is to be operated at 27C and 4 atm. Pure A enters the system at a volumetric flow rate of 10dm3/min. (a) Sketch the instantaneous selectivities (SB/X,SB/Y, and SB/XY=rB/(rX+rY)) as a function of the concentration of CA. (b) Consider a series of reactors. What should be the volume of the first reactor? (c) What are the effluent concentrations of A, B, X, and Y from the first reactor? (d) What is the conversion of A in the first reactor? (e) If 99% conversion of A is desired, what reaction scheme and reactor sizes should you use to maximize SB/XY

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