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1. Drying Depth & Adsorption Capacity
Activated Alumina: Suitable for conventional drying, generally achieving a dew point of -40°C. It has a higher water adsorption capacity than molecular sieves when gas moisture content is high.
Molecular Sieves: Suitable for deep drying, capable of achieving a dew point as low as -70°C, and maintain strong adsorption even at low moisture partial pressures—ideal for applications with extremely low moisture requirements.
2. Application Scenarios
Application Scenario | Activated Alumina | Molecular Sieves |
| Industrial gas drying (e.g., air, nitrogen, natural gas) | ✔ Widely used for conventional drying | ✔ Used for deep drying |
| Compressed air drying equipment | ✔ Holds over 80% market share | ✔ Used only when high drying depth is required |
| Gas type adaptability | ✔ Suitable for various gases (e.g., acetylene, hydrogen, CO₂) | ✔ Better for gases requiring high moisture selectivity |
| High-temperature environments | ✘ Adsorption capacity decreases at high temperatures | ✔ Maintains adsorption at high temperatures |
Activated Alumina: Lower cost, high mechanical strength, good water resistance—ideal for large-scale conventional drying.
Molecular Sieves: Higher cost, lower mechanical strength, prone to pulverization when exposed to liquid water—but irreplaceable in certain high-end applications.
4. Combined Use Strategy
In industrial practice, the two are often used together:
Bottom layer: Activated Alumina – Uses its high strength and water resistance to remove the majority of moisture.
Top layer: Molecular Sieves – Performs deep drying to ensure the gas meets strict dryness standards.
This combination saves cost and improves drying efficiency.
