| 摘要 |
<p>An improved adsorption-desorption process is provided for separating gaseous mixtures. The process includes the old steps of passing a stream of crude gaseous mixture under superatmospheric pressure through a first adsorber; then withdrawing from said first adsorber a stream of product gas depleted in undesired component; then switching the stream of crude gaseous mixture to a second adsorber when the impurity concentration at a given location before the exhaust end of the first absorber exceeds a given value in the gas; then, after the crude gas stream is switched away from said first adsorber, decompressing the first adsorber in at least one decompression stage to release residual product gas therefrom; and finally employing said residual product gas to re-pressurize an adsorber. The improvement comprises: conducting the decompressing in at least two separate decompression stages; then collecting the residual product gas from each decompression stage in separate storage vessels; then withdrawing residual product gas from one storage vessel and purging the decompressed adsorber to desorb undesired impurities therefrom; and finally withdrawing residual product gas from another of said storage vessels and partially re-pressurizing the purged adsorber therewith. This system requires less valving, is simpler and is less expensive to operate.</p> |
