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Molecular sieve is a porous crystalline aluminosilicate material, which is widely used in the drying and purification of various refrigerants due to its unique selective adsorption and drying properties.
3A molecular sieves are used for drying of various liquids (such as ethanol); drying of air; drying of refrigerants; drying of natural gas and methane; drying of unsaturated hydrocarbons and pyrolysis gas, ethylene, acetylene, propylene, butadiene. 3A molecular sieve is mainly used in architectural glass industry, gas refining and purification and petrochemical industry.
3A molecular sieve is also called potassium A type (3A) molecular sieve, its pore size is 3A, it is mainly used to adsorb water, it can adsorb molecules with a critical diameter of 3A, and does not adsorb any molecules with a diameter larger than 3A. According to the characteristics of industrial application, the molecular sieve has faster adsorption speed, more regeneration times, higher crushing strength and anti-pollution ability, which improves the utilization efficiency of molecular sieve and prolongs the service life of molecular sieve. Desiccant necessary for gas-liquid phase deep drying, refining and polymerization in chemical industry. 3A molecular sieve can adsorb molecules whose critical diameter is not larger than itself. Aluminum is connected by oxygen bridges to form a hollow skeleton structure. In the structure, there are many pores with uniform pore diameters and voids arranged neatly and with a large internal surface area.
In addition, it also contains metal ions with low electricity price and large ionic radius and combined water. Because the water molecules lose continuously after heating, but the crystal skeleton structure remains unchanged, many cavities of the same size are formed, and the cavities are connected with many micropores of the same diameter. Molecules with small diameters are adsorbed into the interior of the pores, and molecules larger than the pores are excluded, so molecules with different shapes and diameters, molecules with different polarities, molecules with different boiling points, and molecules with different degrees of saturation can be separated. Openly, it has the function of "sieving" molecules, so it is called molecular sieve. 3A molecular sieve can adsorb molecules whose critical diameter is not larger than itself. At present, molecular sieves are widely used in metallurgy, chemical industry, electronics, petrochemical, natural gas and other industries.
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