This book investigates the effect of tray spacing on the dimensions, head losses and flooding tendencies in a sieve - tray distillation column. The system under consideration was chosen to be a 50:50 mole % mixture of methanol and water at its boiling point. The saturated liquid feed is separated into products streams of 99.5 mole % purity. For a given sieve tray (holes arranged in a triangular pitch) with fixed specifications of hole diameter, pitch, tray thickness, weir height and proportion of downcomer area, the variables were determined for values of tray spacing ranging from 0.5 feet...