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一、Differences in Pore Size   Pore size varies among molecular sieves, leading to differences in their filtration and separation capabilities. Simply put: 3A molecular sieves can only adsorb molecules smaller than 0.3 nanometers (nm); 4A molecular sieves require adsorbed molecules to be less than 0.4 nm; The same principle applies to 5A molecular sieves (adsorbing molecules < 0.5 nm). When used as a desiccant, a molecular sieve can adsorb at least 21% of its own weight in moisture.   二、Differences in Applications   3A Molecular Sieves are mainly used for drying petroleum cracking gas, olefins, refinery gas, and oilfield gas. They also serve as desiccants in industries such as chemicals, pharmaceuticals, and insulated glass. Typical applications include: drying liquids (e.g., ethanol), air drying in insulated glass, and refrigerant drying. 4A Molecular Sieves are primarily used for deep drying of gases and liquids such as air, natural gas, alkanes, and refrigerants; production and purification of argon; static drying of pharmaceutical packaging, electronic components, and perishable substances; and as dehydrating agents in paints, fuels, and coatings. 5A Molecular Sieves are mainly used for separating normal and isoparaffins; deep drying and purification of gases and liquids; separation of oxygen and nitrogen; and desulfurization of petroleum and liquefied petroleum gas (LPG). They can also act as adsorbents in dewaxing processes using steam as the desorbent. For more information on molecular sieves, please visit www.carbon-cms.com.    

1.Molecular sieving performance Molecular sieves feature an extremely uniform pore size distribution. Only substances with molecular diameters smaller than the pore size can enter the internal cavities of the molecular sieve crystals. For instance, 3A molecular sieves have a pore size of approximately 0.3 nanometers, allowing only water molecules (about 0.27 nanometers in diameter) to pass through while repelling larger molecules (such as propane, around 0.43 nanometers). 5A molecular sieves, with a pore size of roughly 0.5 nanometers, are used for separating oxygen (0.34 nanometers) and nitrogen (0.36 nanometers). This precise "molecular screening" capability makes them key materials for separation and purification processes. 2.Adsorption performance Even if molecules are smaller than the pore size, molecular sieves preferentially adsorb polar molecules (such as water and carbon dioxide) and unsaturated molecules (such as alkenes) through van der Waals forces or hydrogen bonds on the pore surface. This further enhances sieving precision. For example, nitrogen production using carbon molecular sieves achieves efficient nitrogen separation by preferentially adsorbing oxygen (which has slightly stronger polarity). 3.Catalytic performance The pore structure of molecular sieves serves as "microreactors" for chemical reactions. The acidic sites on their surface (generated by the charge balance between the negative charge of aluminum-oxygen tetrahedra and cations) can catalyze carbocation-type reactions. For instance, Y-type molecular sieves, as petroleum cracking catalysts, can crack heavy oil into light fuels like gasoline. They are currently one of the most widely used catalysts in the petroleum refining industry. Any interestes or questions ,welcome to visit us at www.carbon-cms.com.

Molecular sieve, often called zeolites or zeolite molecular sieves, are classically defined as "aluminosilicates with a pore (channel) framework structure that can be occupied by many large ions and water".    According to the traditional definition, molecular sieves are solid adsorbents or catalysts with a uniform structure that can separate or selectively react molecules of different sizes.    In a narrow sense, molecular sieves are crystalline silicates or aluminosilicates, which are connected by silicon-oxygen tetrahedra or aluminum-oxygen tetrahedra through oxygen bridges to form a system of channels and voids, thus having the characteristics of sieving molecules.    Basically, it can be divided into several types of A, X, Y, M and ZSM, and researchers often attribute it to the solid acid category. If you are interested in our products and want to know more details, you can click www.carbon-cms.com.  

Carbon molecular sieve is a new type of adsorbent developed in the 1970s. It is a kind of excellent non-polar carbon-based cellulose material.   The main component of carbon molecular sieve is elemental carbon, and the appearance is a black columnar solid. It contains a large number of micropores with a diameter of 4 angstroms, the micropores have a strong instantaneous affinity for oxygen molecules and can be used to separate oxygen and nitrogen in the air.Nitrogen adopts a normal temperature and low pressure nitrogen production process, which has the advantages of less investment cost, faster nitrogen production speed, and lower nitrogen cost than the traditional cryogenic high pressure nitrogen production process. Therefore, it is currently the preferred pressure swing adsorption (PSA) nitrogen-rich adsorbent for air separation in the engineering industry.   Carbon molecular sieve  is used in the chemical industry, oil and gas industry, electronics industry, food industry, coal industry, pharmaceutical industry, cable industry, and metal It is widely used in heat treatment, transportation and storage. For more information on carbon molecular sieves, please visit www.carbon-cms.com.  

In the carbon molecular production field, tar, as a key raw material, faces great challenges in long-distance transportation in winter due to poor low-temperature fluidity. Traditional electric heat tracing is commonly used, but its energy consumption and safety shortcomings are obvious. After in-depth exploration, our company independently designed a hot water tracing system, which provides an excellent solution to the problem of tar transportation.   This hot water tracing system is an efficient, energy-saving, and safe choice for long-distance tar transportation. By utilizing the factory's heat source and with the optimized design of aluminum pipes and thermal insulation sleeves, it overcomes the problem of difficult low-temperature transportation of tar and has achieved remarkable results in terms of energy and safety. This achievement helps enterprises gain a competitive advantage and also provides valuable references for peers, promoting industrial technological progress and sustainable development. In the future, our company will continue to innovate, overcome more industrial technical difficulties, and make unremitting efforts for the progress of the industry. for more information ,please click www.carbon-cms.com                                                                                                                                      

Our company underwent a strict audit and certification conducted by the CQM (China Quality Mark) Certification Group, based on the three major system standards: ISO 9001 Quality Management System, ISO 14001 Environmental Management System, and ISO 45001 Occupational Health and Safety Management,the company successfully passed the "Three Systems" certification audit.This audit served as an authoritative examination of the company's operational performance since implementing the three system managements, signifying that the company has reached a new level in enhancing its management capabilities and social responsibility awareness.   Shanli initiated ISO Quality and Environment management systems in 2016 and has maintained ISO system certification for 9 consecutive years. In 2023, a resolution by the company's General Management Office led to the introduction of Occupational Health and Safety system management. This involved a comprehensive review of existing management systems and systematic self-inspection and improvement against ISO standards. The company actively promoted energy conservation and emission reduction efforts, optimized waste disposal, rationally planned resource utilization, and fostered a green and environmentally friendly production environment. It established safe operating procedures and emergency plans, improved occupational hazard protection measures, regularly organized safety training and drills, implemented strict quality control processes, and conducted regular internal audits and management reviews, all aimed at fully enhancing the company's overall management capability and service level. if you wanto to get more information about us,you can click www.carbon-cms.com.