Distillation is the separation of two or more distinct layers or zones, which differ in temperature, pressure, composition or phase state. As the tower moves to equilibrium, each zone will have a different concentration, and thus, can be separated from the original mixture. Simply put, the distillation column provides an atmosphere where each liquid component can separate from another by changing the vacuum and temperature. The vacuum system removes the non-condensable load, water and light end from the system allowing the feedstock to be processed through the column to achieve separation. The gas removed from the top of the tower is condensed, and the liquids are reintroduced into the tower for further separation. Typically used on fatty acids, monoglycerides, vitamins (A, E), oils, esters, paraffin, insecticides, plasticizers, etc.