Molecular sieves are synthetic hydrated aluminosilicates (foam zeolites) or natural zeolites with the function of screening molecules. Its chemical formula is (M′2M) O · Al2O3 · xSiO2 · yH2O, and M ′ and M are monovalent and divalent cations such as K +, Na + and Ca22 +, Ba22 +, etc. It has many uniform pores and neatly arranged holes in the structure. Molecular sieves with different pore sizes separate molecules of different sizes and shapes. According to different molecular ratios of SiO2 and Al2O3, molecular sieves with different pore sizes are obtained. Its models are: 3A (potassium A type), 4A (sodium A type), 13X (sodium X type), Y (sodium Y type). It has high adsorption capacity, strong selectivity and high temperature resistance. Widely used in organic chemical industry and petrochemical industry, it is also an excellent adsorbent for gas dehydration.
Ethylene adsorption (‰)
CO2 adsorption (%)
Water content (%)
Wear ratio (%)
1.Molecular sieve adsorption is a physical process that does not produce chemical changes. The adsorption process is reversible, called resolution or regeneration.
2.The zeolite molecular sieve has strong polarity in the crystal cavity, which reflects the adsorption selectivity of zeolite molecular sieve.
3.The size of the zeolite molecular sieve can be changed by ion exchange, thereby changing its performance and achieving the purpose of shape selective adsorption and separation of mixtures.
4.The surface of most zeolite molecular sieves has a strong acid center, and at the same time, a strong Coulomb field in the pores has a polarizing effect. These characteristics make it an excellent catalyst.
1.Dehydration,using the polar hydrophilicity of zeolite molecular sieves with low silicon to aluminum ratio, air and ethanol can be dried.
2.Purify pollutants in the air, H2S, SO2, NOX and formaldehyde.
3.Separation of N2 / O2. In the pressure swing adsorption (PSA) method, zeolite molecular sieves use the difference in equilibrium adsorption of two gases N2 / O2 on its surface to selectively adsorb N2.
4.Adsorption separation method to separate mixed xylene.
5.Increase gasoline octane.
Contact: Will Shi
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