// multi-utility computation suite · offline · instant · precise
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sci.distillation-McCabe-Thiele Calculator
Calculates minimum reflux ratio and number of theoretical stages for a binary distillation from feed composition, relative volatility, and specifications using the McCabe-Thiele graphical method. Minimum reflux (Underwood equation) is approached asymptotically — operating at 1.2–1.5× R_min is the economic optimum.
Inputs
Xd Mol Frac
Reference formula or conversion factor shown for context.
Xf Mol Frac
Reference formula or conversion factor shown for context.
Xb Mol Frac
Reference formula or conversion factor shown for context.
R Reflux
Reference formula or conversion factor shown for context.
Q Feed Quality
Reference formula or conversion factor shown for context.
Results
rectifying section slope L/V
The gradient -- rise divided by run. In finance, rate of change per unit time.
y-intercept of rectifying OL
The y-intercept of the fitted line -- the value when the independent variable is zero.
minimum reflux ratio R_min (approx)
The smallest value in the dataset or feasible range.
minimum theoretical plates N_min
The smallest value in the dataset or feasible range.
separation
The proportional relationship between two quantities.
R/Rmin ratio
The proportional relationship between two quantities.