Binary Distillation · Underwood · O'Connell
Learn graphical distillation design, reflux ratios, and theoretical trays
The McCabe-Thiele method is a graphical stage-stepping technique for binary distillation column design. It determines the number of theoretical stages needed to achieve desired product purities using operating lines and the vapor-liquid equilibrium curve.
The calculator uses Fenske equation for minimum stages at total reflux, Underwood equation for minimum reflux ratio, Gilliland correlation to relate actual stages to reflux ratio, and O'Connell correlation for tray efficiency based on relative volatility and liquid viscosity.
Relative volatility (α) is the ratio of K-values for the light and heavy key components, typically ranging from 1.2 to 4.0 in gas processing applications. Higher α values indicate easier separation requiring fewer stages.
It designs binary distillation columns using the McCabe-Thiele graphical method, calculating minimum reflux, minimum stages, and actual tray requirements.
It uses Underwood minimum reflux, Fenske minimum stages, Gilliland correlation, and O'Connell tray efficiency per GPSA and Perry's.
The calculator follows GPSA and Perry's Chemical Engineers' Handbook methods for binary distillation column design.