What is 4A Molecular Sieves

Characteristics of 4A Molecular Sieves

The pore diameter of 4A molecular sieve is approximately 4 Å (0.4 nm), which is the origin of its name "4A". This specific pore size determines that it can adsorb molecules of a certain size, but cannot adsorb molecules with a diameter larger than this size. Due to its unique microporous structure, 4A molecular sieve has a large specific surface area, which provides it with abundant adsorption sites and makes it have strong adsorption capacity. Compared to other types of adsorbents, 4A molecular sieve still has a high water absorption capacity even at higher temperatures, larger space velocities, and lower moisture content. Moreover, the Na+ ions within the pores of 4A molecular sieve can be exchanged by other metal cations, thus having excellent ion exchange performance.

Application

1, Detergent additive

2, Wastewater treatment

Absorption treatment of NH3-N

Adsorption of heavy metal ions

3, Catalysis field

4A molecular sieve catalyzes the N-tert-butoxycarbonylation reaction under room temperature and solvent-free conditions. 4A molecular sieve also promotes reactions such as the ring contraction of hindered aromatic nitriles and cyclic diketones.

4, Industrial adsorption

The effective pore size of 4A molecular sieve is approximately 0.42 nm, which can effectively adsorb molecules with polarity and molecular dynamic diameters less than 0.4 nm, such as water, hydrogen sulfide, sulfur dioxide, carbon dioxide, etc. As an important desiccant, 4A molecular sieve has a very good drying effect on wide-range distillate oil products, which can extend the storage time of the oil. Especially for oil products containing sulfur, mixing a certain proportion of 4A molecular sieve and 13 molecular sieve can achieve deeper dehydration and desulfurization effects. 4A molecular sieve can also be used for dehydration of liquid ethanol. For example, the concentration of 96% liquid ethanol can increase to over 99% after passing through a 4A molecular sieve packed column. 4A molecular sieve can also be applied in the process of refining argon gas. At low temperatures, 4A molecular sieve can effectively reduce the oxygen concentration. Moreover, the dehydration application of 4A molecular sieve is very widespread. For instance, in the manufacturing of electronic components and precision instrument production industries, using 4A molecular sieve to dry air can effectively reduce the air humidity and ensure the dryness of the production environment. In the pharmaceutical and fine chemical industries, many organic solvents need to undergo drying treatment before use to remove the moisture. 4A molecular sieve can adsorb moisture in organic solvents, such as ethanol and methanol, to improve the purity and quality of the organic solvents. 4A molecular sieve can be added as a desiccant to paints, dyes, and coatings to remove moisture and improve the stability and drying speed of the products.

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