| 摘要 |
<p>PURPOSE:To recover with high recovery rate the gas of high concentration using gas contg. hydrogen sulfide of low concentration as a raw material by returning outgoing gas in an adsorption process of the 2nd stage adsorber to the 1st stage adsorption process and returning outgoing gas in a concurrent purge process of the 2nd adsorber to an adsorption process of the 2nd stage adsorber. CONSTITUTION:Two adsorbers 6a, 6b at the 1st stage are each packed with a hydrogen sulfide adsorbent 5 and four adsorbers 16a-16d at the 2nd stage are each packed with tje hydrogen sulfide adsorbent 5. Gas recovered in the 1st stage vacuum countercurrent purge process is conducted from a passage 13 to a blower 14 to compress it. And, gas flowing from an adsorption process of the 2nd stage adsorbers 16a-16d is returned to an adsorption process of the 1st stage adsorbers 6a, 6b and gas flowing from a concurrent purge process of the 2nd stage adsorbers 16a-16d is returned to the adsorption process of the 2nd stage adsorbers 16a-16d. Further, if necessary, the gas is returned to a countercurrent pressure restoring process of the 2nd stage adsorbers 16a-16d. Thereby hydrogen sulfide of high concentration is obtained with high recovery rate.</p> |
