The mathematic model of multistage multi-componentdistillation is composed of material equation, heat equation, and equilibrium equation, namely MESH equation.
A multitude of separations are accomplished by distillation, but its most important and primary function in the refinery is its use for the separation of crude oil into component fractions.
Methods:Essential oil was extracted from Xinjiang maca by steam distillation, and then was subjected to chemical component analysis by gas chromatography-mass spectrometry(GC-MS).