Estimate distillation column theoretical stages, minimum reflux, feed-stage location, and McCabe-Thiele stair-stepping for binary or pseudo-binary cuts using Fenske, Underwood, Gilliland (Molokanov form), and McCabe-Thiele methods. Use when sizing a new column, screening separation feasibility, or sanity-checking a rigorous simulation. Don't use for rigorous tray-by- tray design (use a rate-based or equilibrium-stage simulator), azeotropic / extractive distillation, or batch distillation.
