When choosing alumina desiccant, it is necessary to comprehensively consider adsorption performance, physical properties, application scenarios, and quality standards. The following are key selection factors:

Evaluate physical properties and appearance

Priority should be given to white spherical particles with smooth surface and uniform particle size (such as 3-5mm or 4-6mm specifications), ensuring no dust or fragmented particles to ensure high mechanical strength (≥ 120 N/particle) and no expansion after water absorption.

Check the bulk density (0.65-0.75 g/ml) and wear resistance (≤ 0.5%) to extend the service life.

The following are core performance matching suggestions for different scenarios:

Adsorption performance parameters

Adsorption capacity: The static adsorption capacity should be ≥ 17% (RH=60%), the water absorption rate should be ≥ 50%, the specific surface area should be ≥ 300 m ²/g, and the pore volume should be ≥ 0.38 cm ³/g to achieve deep drying (dew point ≤ -40 ° C to -70 ° C).

For high moisture gases (such as air compressor systems), choose models with high adsorption capacity; If trace water drying (dew point -70 ° C) is required, the molecular sieve has better performance but higher cost.

Selective adsorption: When treating water (such as defluorination), it is preferred to choose models with strong affinity for polar molecules. The defluorination capacity should be>3.0 mg/g, and the efficiency is higher when the pH value is lower.

Optimize selection based on application scenarios:

Adapt to application scenarios

Industrial gas drying: For air compressors and instrument air systems, use desiccants with specifications of 4-6mm or 5-7mm to ensure dew point ≤ -40 ° C and compressive strength ≥ 150 N/particle to withstand high-pressure airflow.

Environmental protection treatment: When removing fluorine or arsenic, choose small particle sizes (2-4mm) to improve adsorption efficiency, and pay attention to chemical stability (acid and alkali resistance).

Moisture protection: In the fields of electronics or medicine, priority should be given to non-toxic and odorless models (Na ₂ O content ≤ 0.45%) with a moisture content ≤ 1.5% to ensure safety.

Precautions for use and maintenance:

Quality certification and regeneration

Identify the implementation standards (such as HG/T3927-2020), check the indicators such as Al ₂ O3 content ≥ 90% and ignition loss ≤ 7.0%, and avoid using recycled materials.

During regeneration, the temperature should be controlled at 150-300 ° C to desorb moisture, and storage should be sealed to prevent moisture absorption and reduce efficiency.

By matching performance parameters with application requirements, an efficient and economical user experience can be ensured.