Selection of filler material
Release time：2024-07-24
The materials of fillers are divided into three categories: ceramics, metals, and plastics.
(1) Ceramic fillers
Ceramic fillers have excellent corrosion resistance and heat resistance. They are inexpensive and have good surface wetting properties. However, their biggest drawback is their brittleness and fragility. It is widely used in processes such as gas absorption, gas washing, and liquid extraction.
(2) Plastic fillers
The materials of plastic fillers mainly include polypropylene (PP), polyethylene (PE), and polyvinyl chloride (PVC), and polypropylene is generally used in China. Plastic fillers have good corrosion resistance and can withstand the corrosion of general inorganic acids, alkalis, and organic solvents. It has good temperature resistance and can be used for a long time below 100 ℃.
Plastic fillers are lightweight, inexpensive, have good toughness, impact resistance, and are not easily broken, and can be made into thin-walled structures. It has a high flux and low pressure, and is commonly used in devices such as absorption, desorption, extraction, and dust removal.
The disadvantage of plastic fillers is poor surface wetting performance, but its surface wetting performance can be improved through appropriate surface treatment.
(3) Metal fillers
Metal fillers can be made of various materials, and corrosion is the main consideration when selecting.
Carbon steel fillers have low cost and good surface wetting properties, and should be prioritized for use in non corrosive or low corrosive systems.
Stainless steel fillers have strong corrosion resistance and are generally able to withstand corrosion from common systems other than Cl -. However, their cost is high and their surface wetting performance is poor. In certain special situations (such as vacuum distillation processes at extremely low spray densities), surface treatment is required to achieve good performance.
Fillers made of materials such as titanium and special alloy steel have a high cost and are generally only used in certain highly corrosive systems.
Generally speaking, metal fillers can be made into thin-walled structures with high flux, low gas resistance, and high impact resistance. They can be used under high temperature, high pressure, and high impact strength, and have the widest range of applications.
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