Activated alumina desiccant is a new type of trace water depth adsorption material, which is mainly used for the adsorption and drying of various industrial gases, absorbing the water vapor in the gas to achieve an effect of improving the gas dryness. Today I will share with you what indicators are required for activated alumina desiccants for industrial gases. Requirements for activated alumina desiccant for industrial gases. Details are as follows:
1. The specific surface area and porosity: Activated alumina is a porous adsorbent material. The product has the characteristics of well-developed internal pore structure and huge specific surface area. Activated alumina desiccant has the characteristics of large internal specific surface area and external specific surface area. The characteristics of highly porous structure, large exposed surface, and huge internal specific surface area create the performance advantages of large activated alumina adsorption capacity and strong adsorption performance, which has a great influence on the porosity of activated alumina.
2. Adsorption selectivity for different gases: The purpose of the activated alumina desiccant to treat industrial gases is to selectively adsorb certain gas components, so as to achieve the separation of the mixture in the gas. The activated alumina selected for the adsorbed The gas has great selectivity, and is widely used in the fields of air separation oxygen production, nitrogen production, pressure swing adsorption, and athermal gas adsorption.
3. Large adsorption capacity: The adsorption capacity of activated alumina refers to the adsorption capacity of activated alumina per unit weight or unit volume on a certain concentration of adsorbate at a certain temperature is the performance of its adsorption capacity, which affects There are many factors for the adsorption capacity, including the rationality of the adsorbent’s surface size, porosity, and pore size distribution, as well as the polarity of the adsorbent molecule and the nature of the functional group.
4. High mechanical strength, thermal stability and chemical stability
Activated alumina desiccant works under the conditions of humidity, temperature and pressure changes, and needs to have high mechanical strength and thermal stability. At the same time, the adsorbent is required to have high chemical stability when adsorbing corrosive gases. Fluidization is used. In the bed adsorption device, the mechanical strength of the activated alumina desiccant is relatively high.
5. Uniform particle size
When the fixed desiccant filter bed is used, if the selected activated alumina desiccant particles are too large and uneven, it is easy to cause a short circuit in the gas path, uneven gas flow distribution, resulting in gas flow back mixing, short gas residence time in the bed, and reduced adsorption separation effect. If the particle size is too small, the bed resistance is too high, and the adsorbent will be taken out of the device when it is serious. Therefore, it is very important to choose the corresponding activated alumina desiccant according to the design requirements of the equipment. Generally, 3-5mm, 4-6mm, 5-7mm, 6-8mm are commonly used. The demand and the amount of 3-5mm are greater .
In addition, it is also very important that the activated alumina desiccant has the regeneration ability. The regeneration treatment is realized by high-temperature purge of industrial equipment. The principle is that the activated alumina desiccant that adsorbs moisture is heated and reacted by high-temperature purge to release the absorbed moisture To realize regeneration and prolong service life.
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