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4A molecular sieves are divided into strips and spherical shapes, and the diameters of different shapes are also different, but the size of the molecules that can be adsorbed remains unchanged. The granular shape is spherical, with a diameter of 1.7 to 2.5mm and 3.0 to 5.0mm.
4A molecular sieve is a type of A molecular sieve. The cation is sodium ion. The pore diameter is 4nm. It mainly adsorbs molecules with a molecular sieve diameter less than 4A, including water, carbon, alcohols, olefins, etc., and the substances that can be absorbed by 3A molecular sieve can all be adsorbed by 4A molecular sieve. As an alkali metal aluminosilicate, 4A molecular sieve is favored by many customers in terms of the drying of gases and liquids. It can also be used for the refining and purification of gases or liquids, such as the extraction of argon.
The chemical formula of 3A molecular sieve: 2/3K2O13·Na22O·Al2O3·2SiO2.·4.5H2O
The chemical formula of 4A molecular sieve: Na2O·Al2O3·2SiO2·4.5H2O
The chemical formula of 5A molecular sieve: 3/4CaO1/4Na2OAl2O3·2SiO2·4.5H2O
The working principle of molecular sieves is mainly related to the pore sizes of molecular sieves, which are 0.3nm/0.4nm/0.5nm respectively. They can adsorb gas molecules whose molecular diameter is smaller than the pore size. The larger the pore size, the greater the adsorption capacity. The pore size is different, and the things separated by the sieve are also different. Simply speaking, 3A molecular sieve can only adsorb molecules below 0.3nm; in terms of 4A molecular sieve, the adsorbed molecules must also be less than 0.4nm; the same is true for 5A molecular sieve. When used as a desiccant, a molecular sieve can absorb the water which is up to 22% of its own weight.