P11-68 OEQ (Old Exam Question). The irreversible endothermic vapor-phase reaction follows an elementary rate law CH3COCH3 CH2CO + CH4 A - B + C and is carried out adiabatically in a 500-dm3 PFR. Species A is fed to the reactor at a rate of 10 mol/min and a pressure of 2 atm. An inert stream is also fed to the reactor at 2 atm, as shown in Figure P11-60. The entrance temperature of both streams is 1100 K. Fao = 10 mol/min CAT Fio Figure P11-68 Adiabatic PFR with inerts. Additional information: k = exp (34.34) 34222/T)1/s Cp, 200 J/mol K (T in degrees Kelvin, K) CpA = 700 J/mol K Cpe = 90 J/mol K Cpc = 80 J/mol. K = 80000 J/mol AHRX a. First derive an expression for CA01 as a function of Cao and 0. b. Sketch the conversion and temperature profiles for the case when no inerts are present. Using a dashed line, sketch the profiles when a moderate amount of inerts are added. Using a dotted line, sketch the profiles when a large amount of inerts are added. Qualitative sketches are fine. Describe the similarities and differences between the curves. = C. Sketch or plot and then analyze the exit conversion as a function of O. Is there a ratio of the entering molar flow rates of inerts (1) to A (i.e., 0, = Fio/Fao) at which the conversion is at a maximum? Explain why there "is" or "is not a maximum. d. What would change in parts (b) and (c) if reactions were exothermic and reversible with AHRx = -80 kJ/mol and 2 dm3/mol at 1100 K? e. Sketch or plot Fg for parts (c) and (d), and describe what you find. = KC