Features Of Molecular Sieve

Molecular sieve has a very strong moisture absorption capacity (so it is widely used as a desiccant) and is used for gas purification. Avoid direct exposure to the air during storage. Molecular sieves that have been stored for a long time and have absorbed moisture should be regenerated before use. Molecular sieve avoids oil and liquid water. Try to avoid contact with oil and liquid water when in use. The gases to be dried in industrial production include air, hydrogen, oxygen, nitrogen, argon, etc. Two adsorption dryers are used in parallel, one works, and the other can be regenerated. Alternate work and regeneration to ensure continuous operation of the equipment. The dryer works at 8-12°C, and regenerates when heated to 350°C. Different specifications of molecular sieve have slightly different regeneration temperatures. Molecular sieves have a good catalytic effect on certain organic gas phase reactions.

Also known as zeolite or zeolite, it is a crystalline aluminosilicate. Its crystal structure has regular and uniform pores. The pore diameter is the order of the molecular size. It only allows molecules with a smaller diameter than the pore diameter to enter, so it can The molecules in the mixture are sieved by size. So it is called molecular sieve. As early as more than 200 years ago, B. Kronstedt was the first to name aluminosilicates zeolite. The general formula of chemical composition is that where M and n are metal ions and their valences; x is silicon dioxide. Number of molecules; y is the number of water molecules; p is the number of aluminum atoms; q is the number of silicon atoms. Molecular sieves are used as solid adsorbents in the chemical industry. The adsorbed substances can be desorbed, and molecular sieves can be regenerated after use. It is also used for the drying, purification, separation and recovery of gases and liquids. Since the 1960s, it has been used as a cracking catalyst in the petroleum refining industry. Now a variety of molecular sieve catalysts suitable for different catalytic processes have been developed.