How To Use Molecular Sieves, Activated Alumina And Silica Alumina Gel for Deep Dehydration?

Division and Core Characteristics of the Three Adsorbents

1. Silica Alumina Gel (for the first layer of coarse desorption, on the inlet side)

Advantages: Maximum water absorption capacity at normal temperature and high humidity (25% - 30% mass water absorption rate), low regeneration temperature (150 - 180℃), lowest cost; primarily removes a large amount of free water and saturated water vapor, significantly reducing the load of the subsequent two stages.

Function: Pre-cleaning, buffer liquid impact, protection of alumina and molecular sieve.

2. Activated Alumina (middle layer, transitional buffer)

Advantages: High mechanical strength, resistance to liquid impact, oil and impurity resistance; 15% - 20% water absorption capacity; balanced adsorption performance in dry and wet conditions; regeneration temperature 180 - 240℃; capable of filtering trace oil mist, protecting molecular sieve from being damaged by heavy hydrocarbons/oil.

Function: Intermediate deep desorption, impurity interception, connecting the upper and lower stages, significantly extending the service life of molecular sieve.

3. Molecular Sieve (3A/4A/13X, top layer for fine desorption outlet side)

Advantages: Uniform micropores, strong adsorption even at extremely low water vapor pressure; can stabilize the gas dew point to -70 - -100℃, water content < 1ppm, the only adsorbent capable of achieving ultra-deep desorption.

Function: Terminal polishing, removing residual trace water vapor from alumina, meeting the requirements for deep desorption in high-purity/low-temperature processes.

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