Project ForgeChemical Reaction Engineering
Ideal Reactor Design
GATE 2015
Hard
A CSTR (1m³) runs first-order A→products with recycle ratio R. Fresh feed Q=0.5 m³/min, CA0=1 mol/m³. At R=0.5, XAf=50%. At R=2, the new exit conversion (%) is
- 50.0
- B54.3
- C58.7
- D63.2
Explanation
Recycling around a SINGLE CSTR doesn't change its steady-state operating point, since the recycled stream has the same composition as the reactor's own exit — the conversion is invariant to recycle ratio, staying at 50.0%.
Source: GATE CH 2015 (2015)
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