vacuum distillation below the pressure of 0.01 torr. It is a process of separation, purification and concentration of natural products, complex and thermally sensitive molecules for example vitamins and polyunsaturated fatty acids.
Using different evaporation temperatures on mixed materials to separate. Example- heating mixture to evaporation one part of while staying below evaporation of second.
Short path distillation is defined as distance between heating element and condenser being equal to or less than the mean free path ( distance a molecule can travel in a vacuum with out striking another molecule). This distance varies dependent on the vacuum pressure inside the chamber.