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What are the differences in principle, application and performance between activated alumina dehydration and molecular sieve high-precision dehydration?
INDUSTRY NEWS 2024-07-16

Activated alumina dehydration

Principle: Activated alumina has a porous structure and a large surface area, and can remove water molecules from gas or liquid by physical adsorption. It mainly relies on the pores on the surface to adsorb water molecules.

 

Application: Mainly used for gas drying, liquid drying, air separation equipment, hydrogen production equipment, etc.

 

Performance:

- High adsorption capacity.

- Suitable for high temperature conditions.

- Has a certain tolerance to acidic and alkaline substances.

- Strong regeneration ability, can be regenerated by heating desorption.

 

Molecular sieve high-precision dehydration

Principle: Molecular sieve is a synthetic crystalline aluminosilicate with uniform pore size and can be selectively adsorbed. Depending on the pore size, the molecular sieve can selectively adsorb molecules of a specific size. For water molecules, commonly used molecular sieves are 3A, 4A, 5A and other types, and their pore sizes are 3Å, 4Å, and 5Å respectively.

 

Application: Mainly used in high-precision gas separation, liquid drying, petrochemical, pharmaceutical, electronics industry and other occasions requiring high-purity dehydration.

 

Performance:

- High selectivity, able to accurately adsorb molecules of a specific size (such as water molecules).

- Strong adsorption capacity, very high selectivity for water.

- Strong regeneration ability, can be regenerated by heating or decompression desorption.

- Suitable for low temperature environment, can also effectively dehydrate at low temperature.

 

Summary

- Dehydration efficiency: Molecular sieves have higher selectivity and precision, suitable for occasions requiring high-purity drying; activated alumina is suitable for general dehydration needs.

- Regeneration method: Both can be regenerated by heating, but the regeneration conditions of molecular sieves are usually more stringent.

- Application scenarios: Activated alumina is mostly used for drying of general gases and liquids, while molecular sieves are used for dehydration processes that require high precision and high purity.

 

These two materials have their own advantages in specific applications, and the choice needs to be determined according to the specific process requirements and application environment.