Calculators›McCabe-Thiele
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McCabe-Thiele Method

Binary Distillation · Underwood · O'Connell

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McCabe-Thiele Distillation Calculator
Graphical method for binary distillation design determining theoretical stages and reflux ratio. Constructs operating lines, q-line, and equilibrium curve per GPSA constant molar overflow methodology.

Feed Conditions

mole frac
lbmol/hr
q = liquid fraction in feed

Product Specifications

mole frac
mole frac
-
Note: α = K_light / K_heavy (typically 1.2-4.0)

Operating Parameters

-
psia
cP
VLE Equation:
y = αx / [1 + (α-1)x]
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About This Calculator

Determines theoretical stages and operating conditions for binary distillation using the McCabe-Thiele graphical method.

Key Aspects:

  • VLE: Equilibrium curve from relative volatility
  • Stages: Theoretical stages via step-off method
  • Reflux: Minimum reflux from Underwood
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