-1 X x=k,C k, =0.004(mol/dm')2.min kz=0.3 min- 1/2 Ig = k,C, A → Y ry =k,C k3=0.25 dm/mol - min
Consider the following system of gas-phase reactions:
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 27oC. The reaction system is to be operated at 27oC and 4 atm. Pure A enters thesystem at a volumetric flow rate of 10 dm3/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 maximizeSB/XY?
(f)Suppose thatE1=20,000 cal/mol,E2=10,000 cal/mol, andE3=30,000 cal/mol. What temperature would you recommend for a single CSTR with a space time of 10 min and an entering concentrationof A of 0.1 mol/dm3?
(g)If you could vary the pressure between 1 and 100 atm, what pressure would you choose?
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