| 摘要 |
In the separation and recovery of gases which are relatively strongly adsorbable on adsorbents (product gas components), especially methane or carbon dioxide, from gas mixtures which otherwise contain essentially only more lightly adsorbable gases (waste gas components), and especially carbon-containing adsorbents by means of the pressure- swing technique in adsorbers, wherein the starting gas mixture which is to be separated is passed in the adsorption phase through an adsorbent layer with adsorption of the product gas component(s) and outflow of the waste gas component(s), until just before the product gas component(s) break(s) through, the product gas component(s) is or are then desorbed by lowering the pressure and flushing and, after conclusion of the desorption, the gas pressure in the adsorber is restored by a gas mixture from the pressure-swing process for a new adsorption phase, a product gas of high purity and yield is obtained by flushing with product gas components of approximately product gas quality, at least towards the end of flushing, up to adsorption pressure, the gas initially flowing out being passed into the waste gas and the gas flowing out later, which is enriched in the product gas component(s), optionally being recycled to the pressure-swing process, whereupon the desorption phase follows in which, with expansion, especially evacuation, of the adsorber to a lower pressure, a highly enriched product gas is obtained, of which a part is returned to the pressure-swing process for flushing and the rest is recovered. |
