Laboratory packing extraction tower

The packed extraction tower in the laboratory is a device used for liquid-liquid or gas-liquid mass transfer processes, commonly used in experimental research such as extraction, absorption, and distillation. Its core is to provide a larger contact area through fillers, promoting mass transfer efficiency between the two phases. Here is aboutLaboratory packing extraction towerDetailed introduction:

1. Basic structure and working principle

• structural composition：

• tower bodyUsually cylindrical tubes made of vertical glass or corrosion-resistant materials such as stainless steel and PTFE.

• fillerFill the tower to provide a surface area for two-phase contact (such as ceramic rings, metal wire mesh, plastic saddle rings, etc.).

• distributorUsed for evenly distributing liquid or gas phases into the packing layer.

• Separate segmentSet up phase separation zones at the top and bottom of the tower to ensure effective separation of the two phases.

• working principle：

• Two phases (such as light and heavy phases) come into countercurrent contact, forming a liquid film or droplet on the surface of the packing, and completing material transfer through diffusion, convection, and other methods.

• The mass transfer efficiency depends on the specific surface area of the packing, two-phase flow rate, contact time, and physical properties (such as density, viscosity, interfacial tension).

2. Common types of fillers

The performance of fillers directly affects mass transfer efficiency, and common types in laboratories include:

• random packing：

• Raschig RingsTraditional ceramic or metal rings have a simple structure but low efficiency.

• Pall RingsImproved annular packing with openings on the inner wall for higher mass transfer efficiency.

• Saddle PackingIntalox Saddles provide a larger surface area and more uniform flow.

• structured packing：

• Wire mesh filler(such as metal wire mesh corrugated packing): With a large specific surface area and reduced pressure, it is suitable for high-precision separation.

• Structural fillersLike honeycomb or corrugated board packing, the flow path is controllable to reduce backmixing.