Both 4A molecular sieve and activated alumina sphere are adsorbents, both of which have good adsorption capacity. They are commonly used in the industry as adsorbents and desiccants to adsorb moisture and micromolecules in the air. The two can also be used together for better results. The common industry is the use of molecular sieves and activated alumina balls in the adsorption dryer equipment of the air separation industry.
So the question is, what is the difference between 4A molecular sieve and activated alumina sphere, how do we distinguish when we buy it? Today we will introduce in detail, after reading this article you will easily distinguish 4A molecular sieve and activated alumina ball.
The appearance of the 4A molecular sieve is khaki or yellowish brown, spherical particles. The activated alumina spheres are white spherical pellets, and the common specifications are 3-5 mm in diameter. There are still many unscrupulous merchants in the market shoddy, pretending to sell with recycled alumina balls, please be sure to distinguish them when buying, to prevent being deceived, the appearance of regenerated alumina balls is light yellow or light gray, and the surface of the spheres is powdered. It is more serious, the adsorption capacity is relatively poor, and the surface is rough and not smooth.
In terms of adsorption, the adsorption capacity of 4A molecular sieve is higher than that of activated alumina sphere. The good water absorption capacity of 4A molecular sieve is twice its own weight, while the water absorption of activated alumina sphere is only 50%.
Although the adsorption capacity of 4A molecular sieve is high, the crushing strength is far less than that of activated alumina sphere. Take 3-5mm activated alumina sphere as an example. His crushing strength is 120N, while 4A molecular sieve is only 80-90N. Therefore, in the adsorption dryer, the combination of the two: the active alumina ball is laid in the lowermost layer, which plays the role of protecting the molecular sieve adsorbent.