An isothermal aqueous phase reversible reaction, P ⇌ R, is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m3 .h is given by, r = 0.5CP - 0.125CR. A stream containing only P enters the reactor. The residence time required (in hours) for 40% conversion of P is_________________?
Correct answer: C. 1.60
- A. 0.80
- B. 1.33
- C. 1.60
- D. 2.67
Explanation
For a CSTR, the required residence time is τ = Cₚ₀X/(-rₚ). At 40% conversion, Cₚ = 0.6Cₚ₀ and Cᵣ = 0.4Cₚ₀, giving -rₚ = 0.25Cₚ₀ and τ = 0.4/0.25 = 1.60 h.
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