The dehydration principle of molecular sieves is based on the selective adsorption of water molecules
by its microporous structure. Water molecules are polar molecules, and the pore walls of molecular sieves
are composed of silicon-oxygen tetrahedrons and aluminum-oxygen tetrahedrons. The charge distribution
of these tetrahedrons is uneven, resulting in a certain polarity on the surface of the pore wall. Therefore,
water molecules can be adsorbed by the pore walls of the molecular sieve and form hydrogen bonds within
the pores. When gas containing water molecules passes through the molecular sieve, the water molecules
will be adsorbed by the pore walls of the molecular sieve, while other molecules cannot enter the micropores
of the molecular sieve. In this way, water molecules are separated from the gas, thereby achieving the purpose
of dehydration.
In addition, molecular sieve dehydration also takes advantage of the characteristic that the equilibrium
adsorption capacity of the adsorbent decreases as the temperature increases, and adopts the operating
methods of normal temperature adsorption and heating desorption to achieve the separation of different gases.
The above content is for reference only. If you need more information, it is recommended to consult relevant literature
or consult professionals.