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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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The reflux liquid in the upper column of the distillation column is throttled by the lower column to the liquid air and liquid nitrogen of the upper column, and the reflux ratio of the upper column is regulated by the liquid nitrogen throttle valve. When the liquid air and liquid nitrogen pass through the throttle valve, the pressure will decrease, and the corresponding saturation temperature will also be reduced. If the supercooling degree of liquid is not enough, some liquid will be vaporized. The higher the gasification rate is, the lower the reflux ratio of the upper column is, and the purity of nitrogen is affected. Therefore, in order to improve the supercooling degree of the liquid nitrogen in the night sky through the throttle valve, a subcooler is generally set up to increase the supercooling degree of the liquid nitrogen in the liquid air.
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