초록 ▼

In a pressure swing adsorption process, after the adsorption phase, the residual less adsorbable components are purged by the introduction of a gas consisting essentially of the more adsorbable component. The more adsorbable component is subsequently recovered by drawing a vacuum on the adsorber. Wh

In a pressure swing adsorption process, after the adsorption phase, the residual less adsorbable components are purged by the introduction of a gas consisting essentially of the more adsorbable component. The more adsorbable component is subsequently recovered by drawing a vacuum on the adsorber. When separating a gaseous mixture containing 40-75 mol % of the more adsorbable component, after a vacuum recovery step to 0.03-0.3 bar, a first pressure buildup phase is performed with a gas consisting essentially of less adsorbable components. Preferably, the gas is an unadsorbed gas exiting during the adsorption phase from another adsorber. The gas employed in the first pressure build up is introduced into the adsorber countercurrently to the adsorption direction until an intermediate pressure of 0.1-1 bar is reached. A further pressure buildup is then conducted, preferably with expansion gas from another adsorber and/or with the gaseous mixture to be separated.

대표청구항 ▼

In a pressure swing adsorption process for the separation of a gaseous mixture containing at least two components having different adsorbabilities, said process comprising passing the gaseous mixture in an adsorption phase through an adsorber so as to adsorb the more adsorbable component; purging re

In a pressure swing adsorption process for the separation of a gaseous mixture containing at least two components having different adsorbabilities, said process comprising passing the gaseous mixture in an adsorption phase through an adsorber so as to adsorb the more adsorbable component; purging residual less adsorbable component remaining in the adsorber after the adsorption phase by passing into the adsorber a gas consisting essentially of the more adsorbable component; recovering the more adsorbable component by drawing a vacuum on the adsorber; and repressurizing the adsorber to adsorption pressure, the improvement comprising repressurizing the adsorber in a four-phase step comprising a first pressure build-up phase wherein the adsorber is repressurized to an intermediate pressure with a weakly adsorbable gas, said weakly adsorbable gas being unadsorbed gas withdrawn from an adsorber during the adsorption phase; a second pressure build-up phase wherein expansion gas from another adsorber is introduced into the adsorber; a third pressure build-up phase wherein exit purge gas from another adsorber is introduced into the adsorber and a fourth pressure build-up phase wherein the gaseous mixture to be treated is introduced into the adsorber.