Molecular sieves (also known as synthetic zeolites) are aluminosilicate microporous crystals. Mainly used in gas purification purification, petrochemical, refrigeration, automobile, building glass, medicine, paint, packaging other fields. The specific surface area of molecular sieve is 300-1000 m2 / g, the internal crystal surface is highly polarized. It is an adsorbent a solid acid. The surface has high acid concentration acid strength, which can produce positive carbon. Ion catalyzed reaction. Because molecular sieves have this characteristic, what should be paid attention to when storing?
1. Molecular sieve is easy to absorb moisture. During storage, do expose it to the air directly, but keep it in a dry place. Molecular sieves with long storage time hygroscopicity should be regenerated before use.
2. Molecular sieve avoids oil liquid water. Oil can block the pores of molecular sieves. Especially during the regeneration process, the oil may carbonize cause hole blockage. For oil containing oil, oil water should be separated before molecular sieve column. As the molecular sieve will release heat when absorbing water, liquid water will contact molecular sieve directly release a lot of heat. There may be danger the performance of molecular sieves may be damaged.
3. When the molecular sieve tower is switched by pressure operation, the internal pressure of the column should be reduced slowly. For example, if the pressure reduction speed is too fast, the molecular sieve particles may be broken crushed. The higher the regeneration temperature, the safer the regeneration, but the higher the regeneration energy consumption, the longer the life of molecular sieve. Therefore, the regeneration temperature is between 200 350 ℃. The regeneration temperature usually does exceed 600 ° C, otherwise the molecular sieve may lose its activity.
In order to achieve the above three points, I believe that the problem of molecular sieve storage will be solved.