What Is Molecular Sieve丨Introduction To The Molecular Sieve Industry

Molecular sieves adsorbent are a type of inorganic non-metallic porous crystalline material with a large specific surface area, regular pore structure, and excellent adsorption, ion exchange and catalytic properties. They can effectively separate and selectively activate molecules with different diameters, different polarities, different boiling points, and different degrees of saturation of organic hydrocarbon molecules, and have the functions of "screening molecules" and "shape-selective catalysis".

According to industrial uses, they can be divided into catalyst molecular sieves, adsorption separation molecular sieves (multi-component gas separation and purification), and ion exchange molecular sieves, which are widely used in petrochemicals, coal chemical industry, fine chemicals, metallurgy, medicine, environmental protection (including wastewater, waste gas treatment), and other fields.

Main technical thresholds and barriers: The production process of molecular sieves requires a high level of synthetic technology, and the cycle from product research and development to actual mass production is long. There are high technical barriers in product process technology, production management, quality control and other links. The advancement of the company's production technology and process determines the product yield rate, quality stability, raw material consumption per unit product, and energy consumption, and also directly determines the company's competitiveness and profitability.

Xintao Molecular Sieve Adsorbent

As a Chinese molecular sieve manufacturer with 22 years of experience, Xintao specializes in the research and development and production of molecular sieve series new material products. It has rich professional and technical knowledge, long experience in chemical product production, and strong production strength. It also has more than 20 years of domestic and foreign trade experience. Its products are widely exported to more than 400 countries and regions around the world, providing high-quality molecular sieve products and technical services to more than 20,000 customers.

What Are The Types Of Molecular Sieves?

Synthetic molecular sieves can be basically divided into A, X, Y, M and ZSM models.

The A, X and other types of molecular sieves provided by Xintao can be further subdivided according to pore size, crystal form and constituent elements, and their performance is different. Commercial molecular sieves are often classified by prefix numbers. For example, type A molecular sieves can be subdivided into 3A/4A/5A molecular sieves, etc., and the corresponding molecular sieve pore sizes are 0.3/0.4/0.5 nm respectively. They can adsorb gas molecules with molecular diameters smaller than the pore size. The larger the pore size, the greater the adsorption capacity. A-type molecular sieve containing Na+ is recorded as Na-A, X-type molecular sieve containing Na+ is recorded as Na-X molecular sieve (also known as 13X type). If Na+ in Na-A type molecular sieve is replaced by K+, the pore size is about 3A, recorded as 3A type molecular sieve; if more than 1/3 of Na+ in Na-A type molecular sieve is replaced by Ca2+, the pore size is about 5A, recorded as 5A type molecular sieve. Molecular sieves have high adsorption efficiency and catalytic properties. Among them, 3A type, 4A type, 5A type, 13X type and other molecular sieve products are mainly used in gas separation, drying and purification in oil refining, petrochemical, coal chemical, fertilizer, metallurgy, electronics and other industries;

What Are The Applications Of Molecular Sieves?

Molecular sieve is an indispensable basic consumable for air separation equipment, and its quality is crucial to the safety of equipment operation and production efficiency. Industrial gases represented by oxygen are the "blood of industry". The essence of industrial gas preparation is to separate and purify target gases such as oxygen, nitrogen, and hydrogen. The core is gas separation equipment and adsorbents such as molecular sieves. There are two main ways to produce industrial oxygen: cryogenic air separation and pressure swing adsorption oxygen production. Molecular sieve is an indispensable basic consumable, and its quality is crucial to the safety of air separation equipment operation and production efficiency.

Cryogenic Air Separation Molecular Sieve

Cryogenic air separation molecular sieve purification system: In cryogenic air separation equipment, the role of the molecular sieve purification system is to remove impurities such as moisture, acetylene, carbon dioxide, and olefins contained in the air, and prevent these impurities from entering low-temperature heat exchangers, turbine expanders, or distillation towers with air to cause freezing and blockage, thereby ensuring the long-term safe operation of air separation equipment. Generally, the large adsorption capacity of activated alumina for saturated water in the air is used to initially adsorb moisture, and then the molecular sieve is used for deep adsorption to dry the treated air to the required dew point. The commonly used molecular sieve adsorbents are 13X molecular sieves and their modified products.

Pressure Swing Adsorption Molecular Sieve

The demand for molecular sieves in the medical and healthcare oxygen production field is explosive and has great potential for future growth. Healthcare oxygen production is mainly targeted at two markets: centralized oxygen supply in medical and health institutions and household oxygen production. Compared with traditional cylinder oxygen and liquid oxygen, molecular sieve medical oxygen generators have the advantages of high safety, high oxygen production efficiency, and high economic value. Its popularity has accelerated under the influence of the new coronavirus epidemic, making up for the shortage of cylinder oxygen and liquid oxygen sources. , the future centralized oxygen supply in hospitals will open up the demand for medical oxygen production molecular sieves. The home health care oxygen concentrator has the advantages of being ready for use, fresh and natural, and can produce oxygen concentration of more than 90%. In the future, with the aging of the population and the improvement of people's health awareness and consumption power, molecular sieve oxygen concentrators can provide better oxygen support for the large elderly population, people with high-intensity mental work, people at plateau, and patients with chronic obstructive pulmonary disease.

Hydrogen Production Molecular Sieves

The market space for hydrogen production series molecular sieves is vast. The world regards hydrogen energy as the strategic development direction of new energy in the future. Hydrogen production series molecular sieves have significant advantages in the current high-efficiency and low-cost recovery and purification of high-purity hydrogen from industrial exhaust gases. It is also conducive to helping equipment users comprehensively Utilizing resources to achieve energy conservation and emission reduction goals is of great significance to clean energy strategies such as hydrogen energy strategy and fuel cell new energy vehicles.

LPG Drying And Desulfurization Molecular Sieves

Molecular sieves have become one of the most widely used adsorbents in the oil refining process. They are widely used in the drying and desulfurization of liquefied petroleum gas (LPG), the drying of naphtha and kerosene, the drying of alkylation raw materials, the drying of refinery gas, etc. Processes such as drying and purification of raw materials and regenerated hydrogen, thus helping to obtain products with lower impurity content, reduce acid consumption, prevent corrosion of downstream equipment, filter out chlorine regenerated from the catalyst and prevent reformed gas from cryogenic processing Pipeline freeze-blocking occurs.

In the field of petrochemical industry, molecular sieve adsorbents can be used as desiccants to effectively dehydrate materials such as ethylene and styrene, thereby obtaining high-purity chemical raw materials and improving the quality of chemical products; at the same time, molecular sieves can also help remove contaminants in many processes. Trace pollutants can be used in sulfur and nitrogen mixing, oxidation process, mercury treatment process, solvent, comonomer treatment and other processes.

Natural Gas Purification Molecular Sieves

Molecular sieves can effectively remove acidic gases and water vapor from natural gas. Natural gas will form different concentrations of hydrogen sulfide gas during its natural formation and mining process. This gas is a colorless and highly toxic gas. In addition, natural gas extracted from oil and gas fields contains a certain amount of water. Acidic substances (such as H2S, CO2) in natural gas combine with water to form an acidic solution, which can easily reduce the pipeline transmission speed and corrode the pipeline. Therefore, the removal of CO2, H2S and water vapor is a necessary part of the natural gas purification process. Molecular sieve desulfurization is widely used in natural gas desulfurization at present, and the degree of industrialization is high. This method is usually used in some natural gas with relatively low sulfur content. In actual application, when the water content of natural gas is high, in order to ensure the quality of molecular sieve desulfurization, triethylene glycol dehydration can be combined with molecular sieve desulfurization process to effectively implement the effective purification of natural gas.

Refrigeration Systems Molecular Sieves

Molecular sieve adsorbents are commonly used in adsorption refrigeration systems. Adsorption refrigeration has the characteristics of simple structure, no moving parts, low noise, long life, etc. It can effectively utilize low-grade thermal energy (such as industrial waste heat, engine exhaust, solar energy, etc.), and does not use Freon refrigerants. It is environmentally friendly and has received increasing attention. The adsorption bed with adsorbent is the core of the adsorption refrigeration system. Its heat transfer performance has a great influence on the operating performance of the system. This is because the heat transfer coefficient of the adsorption bed directly affects the heating and cooling rates of the adsorption bed. For the same heat source and cold source temperature, if the heat transfer performance of the adsorption bed is good, the adsorption tolerance of the adsorption bed is large, and the refrigeration power is large. Therefore, the enhanced heat transfer of the adsorption bed is one of the important contents of adsorption refrigeration research. Zeolite molecular sieve is a commonly used adsorbent that can form an adsorption working fluid pair with water and ammonia. It will gradually increase with the increase in demand for refrigeration appliances such as air conditioners and refrigerators.

Conclusion

The above is the product introduction of molecular sieve adsorbent described by Xintao Technology, as well as an overview of its types and application. Welcome to cooperate with Xintao. If you have any purchase needs for molecular sieves, please contact us