Reactor sizing (CSTR & PFR) worksheet with answers

Free printable Reactor sizing (CSTR & PFR) worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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1.Easy
V = ?, k = 0.1 min⁻¹Q = 10 L/minX = 50%

A first-order liquid-phase reaction A → B with k = 0.1 min⁻¹ is carried out in a continuous stirred-tank reactor (CSTR) fed at 10 L/min. The density is constant and the reactor is at steady state. Find the reactor volume V in litres for 50% conversion of A.

Q = 10 L/mink = 0.1 min⁻¹X = 50%
V = L
2.Easy
V = ?, k = 0.5 min⁻¹Q = 25 L/minX = 50%

A first-order liquid-phase reaction A → B with k = 0.5 min⁻¹ is carried out in a continuous stirred-tank reactor (CSTR) fed at 25 L/min. The density is constant and the reactor is at steady state. Find the reactor volume V in litres for 50% conversion of A.

Q = 25 L/mink = 0.5 min⁻¹X = 50%
V = L
3.Medium
Q = 80 L/minX = 70%V = ?, k = 0.5 min⁻¹

A first-order liquid-phase reaction A → B with k = 0.5 min⁻¹ is carried out in a plug-flow reactor (PFR) fed at 80 L/min. The density is constant and the reactor is at steady state. Find the reactor volume V in litres for 70% conversion of A.

Q = 80 L/mink = 0.5 min⁻¹X = 70%
V = L
4.Medium
Q = 25 L/minX = 90%V = ?, k = 0.25 min⁻¹

A first-order liquid-phase reaction A → B with k = 0.25 min⁻¹ is carried out in a plug-flow reactor (PFR) fed at 25 L/min. The density is constant and the reactor is at steady state. Find the reactor volume V in litres for 90% conversion of A.

Q = 25 L/mink = 0.25 min⁻¹X = 90%
V = L
5.Hard
Q = 80 L/minX = ?V = 500 L

A first-order liquid-phase reaction (k = 0.4 min⁻¹) runs in a 500 L plug-flow reactor (PFR) fed at 80 L/min. The density is constant and the reactor is at steady state. Find the conversion X in percent.

V = 500 LQ = 80 L/mink = 0.4 min⁻¹
X = %
6.Hard
Q = 25 L/minX = ?V = 100 L

A first-order liquid-phase reaction (k = 0.3 min⁻¹) runs in a 100 L plug-flow reactor (PFR) fed at 25 L/min. The density is constant and the reactor is at steady state. Find the conversion X in percent.

V = 100 LQ = 25 L/mink = 0.3 min⁻¹
X = %

Answer key

  1. 1. V = 100 L
  2. 2. V = 50 L
  3. 3. V = 192.6 L
  4. 4. V = 230.3 L
  5. 5. X = 91.79 %
  6. 6. X = 69.88 %

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