Purification of gases
AssigneeThe BOC Group, Inc.
InventorsRavi Kumar, Shuguang Deng
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Abstract
A process for producing a purified gaseous product from a gaseous feedstream such as air containing impurities is disclosed. The impurities such as hydrogen, water vapor, carbon monoxide and carbon dioxide are removed from the gaseous feedstream in a vessel having layers of adsorbents and oxidation catalysts. The placement of the hydrogen to water vapor conversion catalyst downstream of the step of contacting the feedstream with a catalyst to convert the carbon monoxide to the carbon dioxide and the step of removing the carbon dioxide from the feedstream improves not only performance but also the economies of the purification system.
Claims15
A temperature swing adsorption process for producing a gaseous product substantially purified from impurities comprising
- a) removing water vapor from a gaseous feedstream containing impurities;
- b) contacting said gaseous feedstream with an oxidation catalyst to convert carbon monoxide to carbon dioxide;
- c) removing carbon dioxide from said gaseous feedstream of steps (a) and (b);
- d) contacting said gaseous feedstream of step (c) with an oxidation catalyst to convert hydrogen to water vapor;
- and
- e) removing water vapor from said gaseous feedstream of step (d), thereby obtaining said substantially purified gaseous product.
The process as claimed 4 in claim wherein said water vapor removing adsorbent is selected from the group consisting of activated alumina, silica gel, zeolites and combinations thereof.
Dependencies are inferred from the claim text.