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How Do Molecular Sieves Remove Water Molecular sieves have a large surface area, generally 600-1000 square meters per gram. It has a strong adsorption capacity for polarized and polarizable molecules. Water is a strongly polarized molecule, and its molecular diameter is smaller than that of a molecular sieve which is easily absorbed by a molecular sieve. Molecular sieves are best for water removal as in the high temperature above 230℃, they can still hold water molecules well. What Is Molecular Sieve? A molecular sieve is a kind of crystalline aluminosilicate with many regular and uniform pores in the crystal structure,…

Random Packing VS. Structured Packing Packing generally refers to materials that are filled with other objects. In chemical engineering, packing refers to the inert solid materials installed in the filling tower, such as Pall ring and Lacey ring, whose role is to increase the contact surface between the atmosphere and liquid, so that they mix strongly with each other. The purpose of packing is to create surface area for vapor/liquid contact so that Mother Nature (and Father Thermodynamics) can produce chemical separation. Chemical separation includes distillation, absorption, and stripping. There are two main types of packing used in mass and…

What is the Difference Between Molecular Sieve and Desiccant? Ⅰ. What is the molecular sieve desiccant? Some people may think that the two are the same thing. This is because there is a substance that we call the molecular sieve desiccant. It is a synthetic desiccant and has a strong adsorption effect on water molecules. The pore size of the molecular sieve is controlled by different processing techniques. In addition to absorbing water vapor, it can also absorb other gases. Under high temperature conditions above 230°C, water molecules can still be maintained well. But molecular sieve and desiccant are two…

The Difference Between 3A Molecular Sieve and Type B Desiccant for Insulating Glass 1. What is the 3A molecular sieve for insulating glass? Molecular sieve (also known as synthetic zeolite) is a kind of aluminosilicate microporous mesh crystal material, composed of SiO2 and Al2O3 tetrahedrons, with uniform pore size and large specific surface area. There are metal cations (such as Na+, K+, Ca2+, etc.) in the molecular sieve lattice to balance the excess negative charges in the tetrahedron. Different types of molecular sieves have different pore sizes or shapes and can be used to separate a variety of different molecules.…

How Long is the Life Cycle of Activated Alumina Adsorbent? This product is made from pure natural minerals and activated hygroscopic agent. It is green, non-toxic, tasteless and does no harm to the human body. The product has a good adsorption performance, activated adsorption and the function of static dehumidification under the normal temperature and humidity. The range of the application of the activated alumina includes: widely used in the areas of hardware, electrical appliances, leather shoes, clothing and other industries. The activated alumina desiccant is safe, environment- friendly and naturally degradable. 1. The function of the activated alumina desiccant…

Application of Activated Alumina in the Field of Adsorption and Catalysis With a large specific surface area, various pore structure and pore size distribution, and rich surface properties, activated alumina is widely applied to adsorbent, catalyst and support. The alumina used for adsorbent and support is a kind of fine chemical, as well as the specialty one. The requirement to the structure of material property varies in accordance with the purpose, which accounts for the strong specialty and large amounts of brands of the alumina. Compared with molecular sieve, silicone, activated carbon, diatom soil and silicone aluminum, alumina is preferred…

Four Kinds of Treatment of Dampened 4a Molecular Sieve How do you treat moisture absorption when the 4a molecular sieve is not tightly packed or the storage environment is damaged? Today we will discuss the adsorption capacity of molecular sieves and the treatment of moisture absorption. It is widely known that molecular sieve has a highly strong adsorption. It can not only absorb moisture, but also adsorb impurities in the air. Therefore, people often take advantage of this quality to carry out adsorption work in industry in order to achieve good effects on separation and adsorption. What should we do…

Molecular Sieve Poisoning 1. Carbon Molecular Sieve From a chemical point of view, chlorine, hydrogen chloride and carbon do not react at room temperature. Moreover, the content of chlorine and hydrogen chloride in the air is extremely small. So how can carbon molecular sieve be poisoned? Carbon molecular sieve has many micropores. Chlorine gas and hydrogen chloride can react with the solid particles in fine dust in the air and deposit on the surface of . Although the daily amount is small, the surface of the carbon molecular sieve is covered by sediment after a few years. When a large…

Molecular Sieve Types and Structures Ⅰ. There are two types of molecular sieves: natural zeolite and synthetic zeolite. 1. Most natural zeolites are formed by the reaction of volcanic tuff and tuffaceous sedimentary rocks in marine or lacustrine environments. At present, more than 1,000 kinds of zeolite minerals have been discovered, of which 35 are more important. The common ones are clinoptilolite, mordenite, erionite and chabazite. 2. Because is limited by resources, people later use synthetic zeolite in large quantities. Commercial molecular sieves often use prefix numbers to classify molecular sieves with different crystal structures, such as type 3A, type…

The Common Type A Molecular Sieve Uses 1. 3A molecular sieve 3A molecular sieve is mainly used for drying various liquids (such as ethanol), air, refrigerant, natural gas, methane gas; it is also used for drying unsaturated hydrocarbons and cracked gas, ethylene, acetylene, propylene, butadiene. The main application areas are architectural glass industry, gas refining and purification, petrochemical industry, etc. 2. 4A molecular sieve is mainly used for the drying of natural gas and various chemical gases and liquids, refrigerants, medicines, electronic materials and variable substances, the purification of argon, and the separation of methane, ethane, and propane. Its main…

The Characteristics of Common Type A Molecular Sieve 1. 3A molecular sieve 3A molecular sieve is an alkali metal aluminosilicate with a pore size of about 0.3 nanometers, which is mainly used to adsorb water. It does not adsorb any molecules larger than 0.3 nanometers in diameter, and is also called . 2. 4A molecular sieve The has a pore size of about 0.4 nanometers and can adsorb water, methanol, ethanol, hydrogen sulfide, sulfur dioxide, carbon dioxide, ethylene, propylene, etc. Any molecule with a diameter greater than 0.4 nanometers cannot be adsorbed, and the selective adsorption performance of 4A molecular…

The Replacement Method of Activated Alumina Desiccant 1. Remove the activated alumina in the adsorption tank Open the bottom flange of the adsorption and drying device, remove the activated alumina in the adsorption tank, and then use a vacuum cleaner to clean the dust and residue at the bottom. 2. Check the silk screen under the bottom plate of the adsorption tank Check whether the silk screen under the bottom plate of the adsorption tank is damaged. If it is damaged, replace it with the stainless steel 40 mesh or 60 mesh screen, which is a double-layer stainless steel screen.…