ESTIMATE THEORETICAL TRAY REQUIREMENT o Calculate Rmin(Underwood equation) Choose an operating reflux ratio R i Rule of thumb: 1.05 Rmin <R<1.1 Rmin E Estimate theoretical tray requirement ( Gilliland correlation) o Or choose the number of theoretical trays Nt E Rule of thumb: 1.5 Nmin< Nt< 2.0 Nmin E> Estimate the reflux ratio(Gilliland correlation 9/2799 Simple distillation design9/27/99 Simple Distillation Design 8 ESTIMATE THEORETICAL TRAY REQUIREMENT u Calculate Rmin (Underwood Equation) u Choose an operating reflux ratio R ð Rule of thumb: 1.05 Rmin < R < 1.1 Rmin ð Estimate theoretical tray requirement (Gilliland correlation) u Or choose the number of theoretical trays Nt ð Rule of thumb: 1.5 Nmin < Nt < 2.0 Nmin ð Estimate the reflux ratio (Gilliland correlation)