A tray basically acts as a mini-column in which each of it performing a fraction of the separation task. From this we can conclude that the more trays there are, the better the level of separation and that overall separation efficiency will rely fundamentally upon the design of the tray. Trays are designed to amplify vapour-liquid contact by considering the liquid distribution and vapour distribution on the tray. This is because better vapour-liquid contact means better separation at each tray and lead to a better column performance. Less trays will be needed to achieve the same level of separation. The benefits include less energy consumption and lower development costs.