Reactor Sizing Calculator
Size CSTR and PFR reactors for first-order reactions using the design equation V = FA0·X/(−rA).
Inputs
L/min
mol/L
1/min
(1=CSTR, 2=PFR)
Results
Reactor Volume
400 L
Residence Time
40 min
Space Time (τ)40 min
Exit Concentration0.4 mol/L
How to Use This Calculator
- Enter the Feed Volumetric Flow Rate in L/min and the Feed Concentration in mol/L.
- Enter the Target Conversion as a decimal (e.g., 0.80 = 80% conversion of the reactant).
- Enter the First-Order Rate Constant (k) in 1/min at the operating temperature — obtain from kinetics experiments or literature.
- Select the Reactor Type: 1 for CSTR (Continuously Stirred Tank Reactor, well-mixed) or 2 for PFR (Plug Flow Reactor, unmixed axially).
- Read the Reactor Volume in liters — a PFR always requires less volume than a CSTR for the same conversion and first-order kinetics.
- Review the Residence Time (τ) in minutes and Exit Concentration in mol/L to confirm the design meets purity requirements.
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