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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.…

The Particle Diameter and Use Method of 4A Molecular Sieve 1. The particle diameter of 4A molecular sieve 4A molecular sieves are divided into strips and spherical shapes, and the diameters of different shapes are also different, but the size of the molecules that can be adsorbed remains unchanged. The granular shape is spherical, with a diameter of 1.7 to 2.5mm and 3.0 to 5.0mm. 2. How to use 4A molecular sieve 4A molecular sieve is a type of A molecular sieve. The cation is sodium ion. The pore diameter is 4nm. It mainly adsorbs molecules with a molecular sieve…

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…

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…

What Are the Differences Between 3A, 4A, and 5A Molecular Sieves? What is the difference between 3A, 4A, and 5A molecular sieves? Are the three types of molecular sieves the same purpose? What are the factors related to the working principle? Which industries are they used in? Ⅰ. The chemical formula of 3A, 4A, and 5A molecular sieves 1. Chemical formula of 3A molecular sieve: 2. Chemical formula of 4A molecular sieve: 3. Chemical formula of 5A molecular sieve: Ⅱ. The aperture of 3A, 4A, and 5A molecular sieves The working principle of molecular sieves is mainly related to the…

Main Components of Carbon Molecular Sieve and Principles of Nitrogen Production Carbon molecular sieve is a new type of adsorbent developed in the 1970s. It is an excellent non-polar carbon material. Nitrogen-making carbon molecular sieve is used to separate air and enrich nitrogen. The cryogenic high-pressure nitrogen production process has the advantages of low investment cost, fast nitrogen production speed, and low nitrogen cost. Therefore, it is currently the preferred pressure swing adsorption and nitrogen-rich adsorbent for air separation in the engineering industry. This nitrogen is used in the chemical industry, oil and gas industry, electronics industry, food industry, coal…

Regeneration Method and Application of 4A Molecular Sieve In the laboratory, it can be activated and dehydrated by drying in a muffle furnace at a temperature of 350°C and drying under normal pressure for 8 hours (if there is a vacuum pump, it can be dried at 150°C for 5 hours). The activated molecular sieve is cooled in the air to about 200°C (about 2 minutes) and stored in a desiccator immediately. If possible, use dry nitrogen for maintenance during the cooling and storage process to avoid re-adsorption of water vapor in the air. The old molecular sieve after use…