Separation of gases using reactive adsorbents and membranes
Gas separation modules and methods for use including an integrated adsorbent and membrane. In certain refining applications, it is paramount to obtain high purity product gases. Adsorbent beds are effective at removing certain contaminants, such as CO 2 , from gas streams containing product and contaminant constituents to form a product-rich stream. The integrated membrane permits a further separation of products from any unadsorbed contaminant to produce a high purity product, such as hydrogen, stream. The gas separation modules described herein include stacked, radial, and spiral arrangements. Each modules includes a configuration of feed and cross-flow channels for the collection of contaminant gases and/or high purity product gases.
1. A gas separation module comprising:
a first sheet with an inlet zone and an outlet zone, the inlet zone being coated with an adsorbent, the outlet zone being coated with a membrane;
wherein the adsorbent comprises one of an (i) alkali metal carbonate and an oxide of an alkaline earth metal or a transition metal and (ii) alkaline earth metal carbonate and an oxide of a transition metal.
2. The gas separation module of claim 1 , wherein the ratio of a surface area coated by the membrane to a surface area coated by the adsorbent is about 0.5 or less.
3. The gas separation module of claim 2 , wherein the ratio of a surface area coated by the membrane to a surface area coated by the adsorbent is about 0.3 or less.
4. The gas separation module of claim 1 , wherein the membrane comprises a metallic membrane.
5. The gas separation module of claim 4 , wherein the metallic membrane comprises one of palladium or vanadium.
6. The gas separation module of claim 1 , wherein the membrane comprises one of an inorganic membrane, a polymer membrane, a carbon membrane, and a composite membrane.
7. The gas separation module of claim 1 , wherein each of the sheets further comprises an intermediate zone disposed between the inlet zone and the outlet zone, wherein the intermediate zone is coated with a reactive adsorbent that is different from the reactive adsorbent in the inlet zone.
8. A gas separation module comprising:
a first surface with an inlet zone and an outlet zone, the inlet zone being coated with a reactive adsorbent, the outlet zone being coated with a membrane;
wherein the adsorbent comprises one of an (i) alkali metal carbonate and an oxide of an alkaline earth metal or a transition metal and (ii) alkaline earth metal carbonate and an oxide of a transition metal.
9. The gas separation module of claim 8 , further comprising:
a second surface, the second surface configured substantially the same as the first surface;
a first channel between the first surface and the second surface; the first channel allowing a feed flow from the inlet zone of each surface to the outlet zone of each surface.