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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…

Conditions That Need to Be Controlled for Carbon Molecular Sieve Nitrogen Production 1. The conditions for nitrogen production by carbon molecular sieve – air compression purification process. It is necessary to ensure the pure feed air flow into the carbon molecular sieve adsorption column, because particles and organic atmosphere into the adsorption column will block the micropores of the carbon molecular sieve, and gradually reduce its separation performance. The methods of purifying feed air show as follows: (1) Keep the air inlet of the air compressor away from the places with dust, oil mist or organic atmosphere. (2) Passing through…

3A Molecular Sieve is the Most Suitable Desiccant for Insulating Glass Ⅰ. The introduction of molecular sieve Molecular sieve is a synthetic hydrated silicate aluminate (zeolite) or natural zeolite with the function of screening moleculars. Its pore size is similar to general molecular size, which can be controlled by different processing technology. Only molecules with diameters smaller than the aperture are allowed in. Besides adsorbing water gas, it can also adsorb other gases. According to the ratio of silicon to aluminum and crystal structure, molecular sieve can be divided into A type, X type, Y type, etc. According to the…

Category of Packing in Tower Packing Tower packing refers to the small fluid resistance, which is suitable for the process of treating large gas volume and small liquid volume. The liquid flows from top to bottom along the packing surface, and the gas and liquid flow meet in countercurrent or co-current, depending on the specific reaction. The amount of liquid in the packing tower is small. Regardless of the gas or liquid phase, its flow pattern in the tower is close to plug flow. If the solid phase is formed during the reaction, tower packing is unsuitable. The packing tower…

Why Can the Molecular Sieve Be Used As a Solid Acid Catalyst? Ⅰ. Introduction to the molecular sieve catalyst A natural or synthetic chemical substance with a network structure. For example, when cross-linked dextran and zeolite are used as chromatographic medium, the mixture can be fractionated according to molecular size. Molecular sieves are crystalline silicates or aluminosilicates, formed by silico-oxygen tetrahedra or alumino-oxygen tetrahedra connected by oxygen bridges to form a pore and cavity system of molecular sieve molecular size (usually 0.3~2.0 nm). So it has the characteristics of sieving molecules. Also known as zeolite catalyst, it refers to a…

Production Principles of the Carbon Molecular Sieve 1. Production principles of the carbon molecular sieve for nitrogen generator Carbon molecular sieve is the adsorbent on the PSA nitrogen production equipment, which uses the principle of pressure swing adsorption to separate nitrogen from the air. The separation effect of carbon molecular sieve on oxygen and nitrogen in the air is mainly based on the different diffusion rates of these two gases on the surface of carbon molecular sieve. Gas molecules with a smaller diameter diffuse faster, and more enter the micropores of the carbon molecular sieve. Gas molecules with a larger…

Molecular Sieves Are Materials with Uniform Pores The diameter of the molecular sieve is angstroms or nanometers (nm). Molecular sieves can be microporous (2nm), macroporous (50 Ⅰ. Molecular sieve powder adsorbent Molecular sieve powder adsorbent can separate fluids according to molecular size and polarity. For the secondary fine particles of hydrocarbons, straight molecules enter the pores and are adsorbed, and branched molecules cannot enter the pores and pass through the sieve bed. Molecular sieves play an important role in unit processes such as dehydration and purification, as well as unit operations such as drying and adsorption. Catalysis is the application…