| 摘要 |
A process for removing the impurities carbon monoxide, carbon dioxide, water vapour and, optionally, hydrogen from a feed stream, particularly air, comprises (a) initially removing water and carbon dioxide, (b) catalytically oxidising carbon monoxide and hydrogen to form carbon dioxide and water vapour, respectively, and (c) removing the oxidation products. The resulting gaseous stream may then be separated by cryogenic distillation. A pure nitrogen product can thus be produced. The steps (a) to (c) can be performed by passing the feed gas through a bed comprising at least one first layer of adsorbent for performing step (d), at least one second layer of oxidation catalyst for performing step (b), and at least one third layer of adsorbent for performing step (c). Two or more such beds may be sued with at least one bed being used to product the purified gas while at least one other is being regenerated. <IMAGE> |
