How to remove only water vapor from a mixture of CO2 and N2?
Thread Content
Is there any adsorbent that can absorb water without absorbing CO2 and N2? , Thank you!
This post was last edited by xxlqdytnj on 2009-5-22 at 16:19. It seems that 3A molecular sieves can be used for dehydration; on one hand, due to the limitations of their pore structure, CO2 molecules are unlikely to enter these pores. If silica gel is used, it will inevitably adsorb both CO2 and N2
The 3A molecular sieve should be able to do it
Freeze first, then perform trace adsorption using 3A molecular sieve
Using 3A definitely works; I’ve been using it this way all along. Using 5A should also work, as H2O is polar and its adsorption capacity on 5A is much greater than that of CO2; however, the energy consumption for dehydration might be higher with 5A.
3A is suitable; it only adsorbs water, not ethylene, acetylene, ammonia, carbon dioxide, or larger molecules, and is useful for drying petroleum gas and similar substances. Additionally, the aerodynamic diameter of nitrogen is >3.8; hence, 3A will not adsorb nitrogen.