P8-4A Consider the following system of gas-phase reactions: 1 A → X rx = k₁C\/²k, = 0.004(mol/dm³) 1/² min A →B TBk₂CA k

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P8 4a Consider The Following System Of Gas Phase Reactions 1 A X Rx K C K 0 004 Mol Dm 1 Min A B Tbk Ca K 1 (84.46 KiB) Viewed 33 times

P8-4A Consider the following system of gas-phase reactions: 1 A → X rx = k₁C\/²k, = 0.004(mol/dm³) 1/² min A →B TBk₂CA k₂ = 0.3 min-1 A ry=k₂C₁k3= 0.25 dm³/mol. min 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 27°C. The reaction system is to be operated at 27°C and 4 atm. Pure A enters the system at a volumetric flow rate of 10 dm³/min. (a) Sketch the instantaneous selectivities (SB/X, SB/Y, and SB/XY = TB/(rx+ry)) as a function of the con- centration 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 max- imize SB/XY? (f) Suppose that E₁ = 20,000 cal/mol, E₂ = 10,000 cal/mol, and E3 = 30,000 cal/mol. What temperature would you recommend for a single CSTR with a space time of 10 min and an entering concentration of A of 0.1 mol/dm³? (g) If you could vary the pressure between 1 and 100 atm, what pressure would you choose?