Molecular sieve adsorbents were developed to remove water from
liquids and gases more efficiently than the older silica gel and
alumina desiccants. Molecular sieves, because of their crystalline
composition, will yield virtually water-free products. This feature
makes molecular sieves particularly useful in cryogenic operations
where liquefaction of gases is required and water must be
eliminated to avoid freezing.
Molecular sieves offer adsorption selectivity based on molecular
size, molecular affinity for the sieve crystal surface, and shape
of the molecule. Molecular sieve systems are extremely simple to
use for reducing contaminants to nearly undetectable levels
compared to other technologies such as liquid separation
systems.
This, along with the higher efficiency compared to other
adsorption systems, has made molecular sieve systems a popular
engineering choice.
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