A packed fractional distillation column is a device that increases the gas-liquid contact area by filling specific materials (such as glass beads, metal wire mesh, etc.) inside the tower, thereby achieving efficient separation of liquid mixtures with similar boiling points. 

packed fractional distillation column is widely used in laboratory and industrial distillation processes.
Fractionation is a technique for separating liquid mixtures based on the difference in boiling points of each component. When the boiling point difference of the components in the mixture is less than 25 ° C, simple distillation has low efficiency and fractional distillation is required. Among them, packed fractional distillation column refers to the type of distillation column that uses "packing" instead of "tray".
The opposite is the tray column, which has significant differences in structure and mass transfer methods.
Core structure and working principle of packed fractional distillation column
The fractionation column is located above the heating flask and is filled with packing material, such as glass spirals, stainless steel wire mesh, or ceramic rings.
The function of packing is to provide a large surface area, allowing the rising steam to repeatedly condense and re evaporate (i.e. multiple "theoretical plate" operations), thereby improving separation efficiency.
HETP（Height Equivalent to a Theoretical Plate， Theoretical tray equivalent height is a key indicator for measuring packing efficiency - the smaller the value, the higher the efficiency

high vacuum packing distillation column equipment of purifying sulfur-containing compounds phenols amines