| 摘要 |
<p>An improved selective adsorption process is provided for the separation of gaseous mixtures. The process includes a number of steps. The first step includes passing a feed gas mixture containing components A and B successively at a first pressure through two adsorption beds selective for component A until the evolving adsorption front of component A substantially reaches the outflow end of the first adsorption bed or has only insubstantially penetrated into the second adsorption bed; discharging an A-free product gas from the outflow end of the second adsorption bed; then interrupting the feeding of the feed gas mixture to the first adsorption bed. The second step includes expanding both adsorption beds in the adsorption direction to a lower pressure sufficient so that proportions of unadsorbed component A emerge from the first adsorption bed, and so that such emerged proportions from the first adsorption bed are adsorbed in the second adsorption bed; and withdrawing an A-free gas from the second adsorption bed. The next step involves at the same pressure as in the second step, conducting a further gaseous mixture in the adsorption direction through both adsorption beds, the partial pressure of component A in the further gaseous mixture being higher than in the feed gas; interrupting the feeding of the of the further gaseous mixture before the breakthrough of component A through the second adsorption bed; and withdrawing an A-free gas from the second adsorption bed. The next step involves disconnecting both adsorption beds from one another, and expanding the first adsorption bed loaded substantially completely with component A to recover component A; and substantially simultaneously expanding the</p> |
