4A

Molecular sieve is a kind of aluminosilicate compound with cubic lattice. It is mainly composed of silicon and aluminum connected by oxygen bridges to form a hollow skeleton structure. These pores can adsorb molecules smaller than their diameters into the interior of the cavity, and have preferential adsorption capacity for polar molecules and unsaturated molecules, so they can absorb molecules with different polarity, saturation, molecular size and boiling point. So that cause it have the function of “sieving” molecules, that is why they are called molecular sieves.

Molecular sieves have excellent properties such as high adsorption capacity, strong thermal stability, high temperature resistance, and strong selectivity that other adsorbents do not have, making molecular sieves widely used in organic chemical, petrochemical, and various fine chemical industries. Its excellent adsorption performance ( When used as a desiccant, a molecular sieve can absorb up to about 22% of its own weight of water), and it is also an excellent adsorbent for air separation and dehydration, air treatment and purification, and even lots of chemical gas dehydration. It also become more and more popular in the field of waste gas treatment and water purification.

It can be mainly used in the following industries: natural gas, chemical gas treatment, gas separation, water purification treatment, Architectural glass assembly trying chemical industry, medicine, fertilizer manufacturers, paint coatings, medical oxygen production, packaging, automobile exhaust treatment, etc.

4A molecular sieve : chemical formula: Na2O·Al2O3·2SiO2·9/2H2O silicon-aluminum ratio: SiO2/Al2O3≈2 effective pore diameter: about 0.4nm. 4A molecular sieve refers to sodium A-type aluminosilicate, 4A molecular sieve can adsorb molecules with a critical diameter not greater than 4A, and can adsorb water, methanol, ethanol, hydrogen sulfide, sulfur dioxide, carbon dioxide, ethylene, propylene, etc., which can be adsorbed on 3A type Molecules on molecular sieves can be adsorbed on type 4A.