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

Product Description

What is the function of the packing in a high vacuum distillation tower? What are the requirements for a high vacuum distillation tower?

Distillation is a distillation method that uses reflux to achieve high-purity separation of liquid mixtures. It is a widely used liquid mixture separation operation in industry, widely used in sectors such as petroleum, chemical, light industry, food, metallurgy, etc. Distillation operations are classified according to different methods, and can be divided into continuous distillation and intermittent distillation based on the operation mode; According to the composition of the mixture, it can be divided into binary distillation and multicomponent distillation; According to whether additives that affect vapor-liquid equilibrium are added to the mixture, it can be divided into ordinary distillation and special distillation (including extraction distillation, azeotropic distillation, and salt addition distillation); If the distillation process is accompanied by a chemical reaction, it is called reactive distillation.

Answer: In the operation of a packed tower, the liquid comes into contact with the vapor that descends and rises along the surface of the packing from top to bottom. Therefore, the packing surface is a place for mass exchange and heat exchange.

The packing of high vacuum distillation tower must meet the following conditions:
1) The surface area of the filling material per unit volume must be large;
2) The free volume for the liquid phase to come into contact with the gas phase must be large;
3) The resistance to steam must be small (i.e. the cross-sectional area of the gap must be large);
4) Both liquids and vapors must have chemical resistance;
5) The density must be small;
6) The price per unit of effective area must be small.

In distillation, the form and size of the packing in the distillation tower depend on the boiling point difference of the mixture to be separated and the required degree of separation. But the material used depends on the properties of the substance being distilled. Non corrosive substances can be distilled using metal fillers. As for organic halides, acids, anhydrides, sulfur-containing compounds, phenols or amines, they have more or less corrosive effects on metal fillers. For example, alcohols can corrode metal fillers, which requires the use of glass or other inert fillers. Some substances are prone to polymerization during distillation, forming a coating on the surface of the filler. Therefore, glass or inert fillers are used to clean them with strong reagents after distillation.

A distillation packed tower is a common chemical equipment widely used in industries such as petroleum, chemical, metallurgy, etc