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Molecule sieve is small enough to pass through the pores when absorbing larger molecules. It is different from a common filter in that it operates on a molecular level. For instance, a water molecule may be small enough to pass through while larger molecules are not. Because of this, they often function as a desiccant. A molecular sieve can absorb water up to 22% of its own weight.

Molecular sieves are often utilized in the industry, especially for the purification of gas streams and in the chemistry laboratory for separating compounds and drying reaction starting materials.

The content of natural gas is extremely harmful to the aluminum piping and other parts of the liquefaction apparatus-is used in this case.

Methods for regeneration of molecular sieves include pressure change (as in oxygen concentrators),heating and purging with a carrier gas (as when used in dehydration), or heating under high vacuum.