Technical article

Differences of Pall Rings made of different materials


Pall ring is a widely used packings in the chemical industry. However, the pall ring is divided into metal pall ring, plastic pall ring and ceramic pall ring. What's the difference between these 3 kinds of material pall ring?
1. Metal pall ring
In terms of material, metal pall rings are classified into 304, 304L, 316, 316L, carbon steel, 201 and other materials. Before purchasing metal pall rings, we need to know their specific material, specification and thickness. Metal pall rings are mainly used in various separation towers, absorption towers, scrubbers, atmospheric and vacuum distillation units, decarburization of synthetic ammonia, ethylbenzene separation, etc. Metal pall ring can withstand very high operating temperature, with good processing performance, clear quality and high mass transfer efficiency, but its corrosion resistance is relatively poor.
2. Plastic pall ring
From the material point of view, the plastic pall ring is divided into PP, RPP, CPVC, PVDF, PVC, PTFE and other materials. Plastic pall ring is generally applicable to the reaction towers such as the carbon dioxide degassing tower in the distillation, absorption and washing towers at medium and low temperatures (generally 60~150 ℃) in petroleum, chemical, gas and environmental protection industries as contact fillers. Plastic pall ring is light in weight, high in mass transfer efficiency and cheap in price, but it is easy to decay under high temperature operating environment.
3. Ceramic pall ring
Ceramic pall ring has excellent acid resistance and heat resistance, and can resist the corrosion of various inorganic acids and organic acids other than hydrofluoric acid. It can also be used in various high-temperature places. It has a very wide range of applications, and can be used in drying towers, absorption towers, cooling towers, washing towers, regeneration towers, etc. in chemical, metallurgy, gas, environmental protection and other industries. Ceramic pall rings have good acid and alkali resistance and high temperature resistance, and are widely used in various packed towers.

According to the introduction of different materials of the pall ring, we believe that you will have a better understanding of this tower packings. How to choose the material of the Pall ring needs to be selected according to the working environment in the packed tower.

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Tracy Chen
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