Production Process and Main Indicators of Molecular Sieves

Production Process and Main Indicators of Molecular Sieves

Processing Technology of Molecular Sieves

Using existing raw materials such as aluminosilicate ores or coal gangue, the production process involves the following steps: crushing, shaping (which can be granulation or extrusion into strips), high-temperature sintering, soaking in an aqueous solution of inorganic substances such as sodium hydroxide, potassium hydroxide, or calcium chloride at a certain temperature for a specific period of time, followed by washing, pressure filtration, crushing, shaping, curing, drying, and activation. (Molecular Sieves Wholesale)

Relationship between Main Indicators of Molecular Sieves and Their Quality

The quality of molecular sieves can be intuitively judged by their main indicators. Below, we will explain the relationship between the main indicators of molecular sieves and their quality.

1. Particle Size (mm, %): This is an appearance indicator of molecular sieves. The particle size range should be controlled such that more than 95% of the particles are within the upper and lower limits; neither the proportion of particles at the upper limit, the lower limit, nor the sum of those at the upper and lower limits should exceed 5%.

2. Static Water Adsorption (mg/g): This is a main indicator of molecular sieves. The amount of static water adsorption basically reflects the quality of the molecular sieve. The range of static water adsorption is generally between 200 - 265 mg/g.

3. Adsorption of Specific Medium (mg/g): This is also a main indicator of molecular sieves. Different molecular sieves need to be tested with a specific medium according to their main uses and standard pore diameters. The test results will directly show the quality of the molecular sieve.

4. Compressive Strength (N per particle): This is a crucial main indicator of molecular sieves. Since most of the working conditions where molecular sieves are used involve large pressure differences (especially during the switching between adsorption and regeneration), if the compressive strength of the molecular sieve does not meet the requirements, it is likely to cause the damage of the molecular sieve. Besides affecting the service life of the molecular sieve, it may also block the equipment pipelines, leading to serious consequences. There is basically an inverse relationship between the compressive strength and the adsorption capacity. How to improve the compressive strength on the basis of maintaining the adsorption capacity is also the key to improving the quality of molecular sieves.

5. Bulk Density (g/ml): This is a main indicator of molecular sieves. There is basically a direct proportional relationship between the bulk density and the compressive strength. Under the condition that the adsorption capacity remains unchanged, the larger the bulk density, the better.

6. Abrasion Rate (%): This is an appearance indicator of molecular sieves. The lower the abrasion rate, the less dust the molecular sieve will generate, the fewer adverse situations will occur during use, and the better the quality of the molecular sieve will be.

7. Moisture Content in Packaging (%): The smaller the moisture content in packaging, it indicates that the pre-adsorption of the molecular sieve during storage and transportation is less. For users, in addition to eliminating the need for unnecessary regeneration treatment, it has greater value.