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Regeneration of molecular sieve for small air separation units

Regeneration of molecular sieve for small air separation units
Jun 15, 2022
Author: DEAR AST

The reverse process of adsorption is regeneration. When the adsorbent is saturated with a certain adsorbent, it cannot adsorb any more adsorbent, then certain measures need to be taken to drive the adsorbed adsorbent away from the surface of the adsorbent, otherwise it cannot work properly. According to the physical properties of the adsorbent, there are two methods of regeneration: one is to pass dry and warmed dirty nitrogen gas into the adsorber, heating the adsorbent, which will desorb the adsorbed mass when the temperature rises and be carried out of the adsorber by the dirty nitrogen gas. The other is to reduce the pressure in the adsorber so that the partial pressure of the adsorbent decreases and the molecular concentration decreases, thus achieving desorption of the adsorbent.
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When the amount of processing air is reduced, the rising steam and reflux liquid in the upper column will be reduced, but the reflux ratio will not change. Therefore, the reduction of processing air in a small range will not affect the purity of oxygen and nitrogen, and the reduction of processing air volume will help to reduce the pressure of the upper and lower columns. However, according to the material balance, the production of oxygen and nitrogen will naturally decrease when the amount of processing air is reduced. If the amount of processing air is too small, there will be leakage on the tray. If the heat and mass exchange of the leaked liquid is not sufficient, the purity of oxygen and nitrogen will be greatly affected, and even the normal production can not be realized. Therefore, the minimum allowable load of distillation column is generally specified.
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