Composite Adsorbent for Simultaneous Dehydration and Gas Separation
Publication Date: 2014-Feb-04
The IP.com Prior Art Database
A composite adsorbent comprised of a shell and core configuration is proposed. The outer shell of the adsorbent particle is proposed to be a desiccant material like activated alumina or silica gel. The core of the adsorbent is proposed to be a zeolite molecular sieve or another microporous porous adsorbent. Figure 1 gives an example of the proposed composite adsorbent.
The utility of the proposed adsorbent is in the simultaneous removal of water and another gas phase component from a gas stream. For example, ambient air consists of mainly O2 and N2, but also contains water. The non-cryogenic production of O2 from ambient air is conducted with N2 selective zeolite adsorbents. However, water is adsorbed more strongly than N2 on zeolites so water removal from ambient air must be conducted before selective N2 adsorption and O2 production can ensue.
The concept proposed herein is that a layer of dessicant in the form of activated alumina or silica gel forms a shell around the selective zeolite effectively protecting the zeolite from water adsorption. This allows the protected zeolite to do its gas separation (e.g. selective N2 adsorption)unencumbered by water adsorption. Therefore, this adsorbent can simultaneously dehydrate gas streams and perform another gas separation operation. This type of adsorbent is particularly useful in rapid cycle PSA applications where short contact times between the...