McCabe–Thiele Distillation Designer

Binary distillation at constant pressure with constant relative volatility — equilibrium-stage construction, live as you drag.

System

Relative volatility α

Compositions (mole fraction, light key)

Distillate x_D

Feed z_F

Bottoms x_B

Feed & operation

Feed quality q

Reflux

R / R_min

Stage model

Murphree efficiency E_MV (%)

100% = equilibrium stages. Applied to plates; a partial condenser stays at equilibrium.

Condenser

Stage animation:

Stage-by-stage table

Stage	Section	y_n (vapor)	x_n (liquid)

Stages numbered from the top; the partial reboiler counts as one equilibrium stage (and a partial condenser, when selected, as stage 1). Feed placed at the optimal stage (operating-line switch at the q-line intersection). R_min from the q-line pinch; N_min from the Fenske equation.
Equilibrium: y = αx / (1 + (α−1)x). Works offline — single file, share freely. Built by Arvind Rajendran with Claude Code · v1.0 · July 2026 · educational & research use · no warranty — use at your own risk
Runs entirely in your browser, no data collected · © 2026 · CC BY 4.0 · Part of the Research Apps suite →