| 摘要 |
<p>A pressure swing adsorption process for separating a product gas comprising less and more readily adsorbable constituents employs four adsorption columns. The following sequence of steps is performed repeatedly. 1. A chosen column is pressurised with feed gas. 2. Less readily adsorbable gas is taken from the column and used to pressurise another column. 3. Product gas is collected from the column. 4. The pressure in the column is reduced to atmospheric pressure. 5. The column is evacuated. 6. The column is purged with gas from another column. 7. The column is pressurised with product gas produced by another column. This sequence of steps is followed by each column in appropriate time relationship with the other columns. A pressure equalisation step may for example be performed between steps 3 and 4. The process can operate with a low feed gas pressure. Flue gases can be treated to separate hydrogen and another gas, eg methane, oxygen, nitrogen, carbon monoxide and carbon dioxide.</p> |
