Technical article

How does molecular sieve absorb moisture?


Molecular sieves have strong hygroscopic ability and are used for gas purification. Avoid direct exposure to air during storage. Molecular sieves that have been stored for a long time and have absorbed moisture should be regenerated before use. Molecular sieves avoid oil and liquid water. When using, try to avoid contact with oil and liquid water. The gases used for drying in industrial production include air, hydrogen, oxygen, nitrogen, argon, etc. Two adsorption dryers are connected 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 is regenerated by flushing under heating to 350°C. The regeneration temperature of molecular sieves of different specifications is slightly different. Molecular sieves have a good catalytic effect on some organic gas-phase reactions. Also known as zeolite, it is a crystalline alumino silicate with regular and uniform pores in its crystal structure, and the pore size is a number of molecular size.
The pore size of the molecular sieve allows only molecules with a diameter smaller than the pore size to enter, so the molecules in the mixture can be sieved by size. It is called molecular sieve. As early as more than 200 years ago, B. Kronstadt was the first to name alumino silicate as zeolite. number of molecules; y is the number of molecules of water; p is the number of atoms of aluminum; q is the number of atoms of silicon. Molecular sieves are used as solid adsorbents in the chemical industry, and the adsorbed substances can be desorbed, and the molecular sieves can be regenerated after use. Also used for 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, and now a variety of molecular sieve catalysts suitable for different catalytic processes have been developed.

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Tracy Chen
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the qr code
the qr code