Molecular sieve manufacturer explains the advanced separation technology of molecular sieve

In the chemical and oil refining industries, separation accounts for 40% of the total energy consumption, and therefore accounts for a significant proportion of processing costs. The improvement of separation technology is the key to improving investment effectiveness and striving to restructure process technologies to minimize harmful emissions and environmental impacts.
Adsorption on solids is used to remove a component from a gaseous or liquid mixture when there is a slight difference in volatility between the components to be separated, or when a component is always in a gaseous or nonvolatile liquid state. The mechanism of adsorption separation is based on the difference in the tendency of substances to reach the solid substrate surface from the gas or liquid phase through enrichment or concentration. Physical adsorption is mainly caused by the van der Waals force and electrostatic attraction between the molecules of the adsorbent and the atoms constituting the surface of the adsorbent. Therefore, the primary properties of an adsorbent are its surface characteristics such as specific surface area and polarity.
The most basic consideration for the adsorption of chemical substances on molecular sieves is based on the screening effect of molecules. The size of micropores determines the accessibility of adsorbed molecules to the inner surface of the adsorbent: substances with a dynamic diameter that is too large cannot pass through the pores, and thus can be effectively "sieved out". This "sieving" effect can achieve accurate separation of molecules based on their size and shape.
This molecular "screening effect" or "spatial effect" can be produced by the pore shape of the crystal itself, but exchangeable cations can also play a similar role. These cations are located in the cage and mainly serve to balance the negative charge carried by aluminum on the molecular sieve skeleton. Cations can effectively block the pore opening and reduce the pore volume. Therefore, molecular sieves can be designed according to precise pore distribution, and can be adjusted in the future, all of which benefit from the combination of molecular sieve structure and cation outside the framework.
In addition to the high electric field gradient caused by the presence of cations within the cage, the skeleton itself also has acid-base properties. In addition to spatial effects, the selectivity of molecular sieves to specific adsorbates also depends on the polarity, magnetic sensitivity, and polarizability of the molecules. Therefore, even without spatial barriers, perfect separation effects can be achieved through molecular sieves.
The hydrophilicity/hydrophobicity of molecular sieves can be adjusted by the silicon aluminum ratio. In high-alumina molecular sieves (such as A-type, LTA-type, X-type, Y-type, or octahedral molecular sieves, mercerized molecular sieves, and other natural molecular sieves), the strong electrostatic field in the pores leads to strong interactions with polar molecules such as water, while high-silicon molecular sieves (such as all silicon molecular sieves and ZSM series molecular sieves) are typical nonpolar adsorbents. Hunan Providence New Materials Co., Ltd is a professional molecular sieve manufacturer which can provide USY zeolite, NaY zeolite, REY zeolite, ZSM-5 zeolite, welcome to consult.