Molecular sieves are divided according to their models, mainly 3A molecular sieve, 4A molecular sieve, 5A molecular sieve, 13X molecular sieve and carbon molecular sieve and refrigeration molecular sieve. The molecular sieve models selected for different uses will vary. What problems should we pay attention to in order to keep its service life longer, thereby reducing the replacement frequency and saving production costs?
Molecular sieve avoids oil and liquid water during use. Oil can block the pores of the molecular sieve. Especially during regeneration, the oil may be carbonized and the pores may be blocked. For oil-containing gas, the oil, gas and oil-water should be separated before the molecular sieve tower. Due to the heat released by the molecular sieve when it absorbs water, a large amount of heat will be released when the liquid water is in direct contact with the molecular sieve. Hazards may occur or the performance of the molecular sieve may be impaired.
Molecular sieves are highly hygroscopic. It should not be directly exposed to air during storage and should be stored in a dry place. Molecular sieves that have been stored for a long time and have absorbed moisture should be regenerated before use. When the molecular sieve tower working under pressure is regenerated and switched, the internal pressure of the tower should be slowly lowered. If the pressure reduction speed is too fast, the molecular sieve particles may be broken and powdered. The higher the regeneration temperature, the safer the regeneration, but the greater the energy consumption for regeneration, and the life of the molecular sieve may be shortened as a result. Therefore, the regeneration temperature is more suitable between 150-200 ° C. The regeneration temperature should generally not exceed 300 ° C, otherwise the molecular sieve may lose its activity.