If the reactions A→B and A→C are represented as (-rA) = k1CA^3 and (-rA) = k2CA^6 of activation energies 130 and 150 J/ mol, then which of the following is the right selection of process parameters to increase selectivity of B?(a) CSTR, High temperature(b) PFR, High temperature(c) CSTR, Low temperature(d) PFR, Low temperatureThis question was posed to me by my college director while I was bunking the class.I'm obligated to ask this question of Parallel Reactions Design topic in portion Potpourri of Multiple Reactions, Design for Single & Parallel Reactions of Chemical Reaction Engineering

If the reactions A→B and A→C are represented as (-rA) = k1CA^3 and

1.	If the reactions A→B and A→C are represented as (-rA) = k1CA^3 and (-rA) = k2CA^6 of activation energies 130 and 150 J/ mol, then which of the following is the right selection of process parameters to increase selectivity of B?(a) CSTR, High temperature(b) PFR, High temperature(c) CSTR, Low temperature(d) PFR, Low temperatureThis question was posed to me by my college director while I was bunking the class.I'm obligated to ask this question of Parallel Reactions Design topic in portion Potpourri of Multiple Reactions, Design for Single & Parallel Reactions of Chemical Reaction Engineering
Answer» The correct option is (c) CSTR, Low temperature To EXPLAIN: Selectivity = \(\frac{k_1 C_A^3}{k_2 C_A^6} = \frac{k_1}{k_2}\) CA^-3 By Arrhenius equation, k = AE\(^\frac{-E_a}{RT} \) Since E1 < E2, temperature has to be DECREASED to INCREASE the yield of B.

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