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Molecular Sieves Regeneration Notes

User:admin AddDate:2015/4/16 Read:6508Times

Molecular sieve regenerated correctly is the same to fresh, the decay and aging of adsorption and mechanical properties is very low.

Molecular sieve regeneration in two basic ways:

1. Changes in temperature, also called "variable temperature." It is to remove adsorbed substances by heating the molecular sieve. Industry generally is to use preheated resurgent gases purge flow molecular sieve to about 200 °, and take down the adsorbed substances.

3. Changes in relative pressure, i.e. "PSA", generally used for gas phase adsorption process. The basic approach is to keep molecular sieve temperature constant, by reducing the pressure, with an inert gas back purge to remove adsorbate.

Regeneration is usually carried out reversed to the adsorption, which can let the most of the adsorbate which be housed in the entrance of the adsorbent bed to be not necessarily through the entire bed, and part of the molecular sieve may not be in contact with the humid gas, thereby increasing the life of the molecular sieve.

Resurgent gases should be dry as possible, otherwise it will affect the adsorption efficiency.

Resurgent gases should preferably be the dry gas handled by molecular sieves or low dew point gas from elsewhere flow path, it is best not to use room air for the molecular sieve bed regeneration treatment, especially in the cold blowing phase, as it tends to be counterproductive.

The heating of process should be segments and carried out slowly, it is best not to use resurgent gases which are direct heating to 200-300℃ to back flush molecular sieve bed, resurgent gases should make a stay when the temperature is in the vicinity of 150 ℃. The time of heating regeneration be sure to prevail when the outlet dew point falls to the inlet dew point (i.e. the product gas dew point).