Pressure swing system with auxiliary adsorbent bed

Details Pressure swing system with auxiliary adsorbent bed Pressure swing system with auxiliary adsorbent bed

B - Operations, Transporting

01

D

B01D 53/053 (2006.01) B01D 53/047 (2006.01)

Patent

CA 2236780

The invention is a pressure swing adsorption system. The pressure swing adsorption system has a plurality of primary adsorbent beds and at least one secondary adsorbent bed. The feed gas stream is flowed to a primary adsorbent bed loaded with an adsorbent that will preferentially adsorb certain components in the feed gas. Non-preferentially adsorbed components flow from the adsorbent bed during this time. Upon saturation of the adsorbent with the adsorbed components the flow of feed gas is ceased. The adsorbent is fully loaded with the preferentially adsorbed component and there is feed gas in the void space between the adsorbent particles. This primary adsorbent bed undergoes regeneration by partial depressurization through the secondary adsorbent bed followed by a complete depressurization to a final lower pressure. There can be two or more primary adsorbent beds and there will be at least one secondary adsorbent bed. The preferred separation is the separation of carbon dioxide from a hydrocarbon containing stream.

L'objet de la présente invention est un système d'adsorption modulée en pression. Le système d'adsorption modulée en pression comporte une pluralité de lits d'adsorbant primaire et au moins un lit d'adsorbant secondaire. Le flux de gaz d'alimentation circule vers un lit d'adsorbant chargé d'adsorbant qui adsorbera de préférence certains composants du gaz d'alimentation. Pendant ce temps, les composants qui ne sont pas adsorbés de manière préférentielle circulent à partir du lit d'adsorbant. Une fois que l'adsorbant est saturé des composants adsorbés, le flux de gaz d'alimentation est interrompu. L'adsorbant est complètement chargé du composant préalablement adsorbé, et un gaz d'alimentation occupe l'espace libre entre les particules d'adsorbant. Ce lit d'adsorbant primaire subit une régénération par dépressurisation partielle à travers le lit d'adsorbant secondaire, suivie d'une dépressurisation complète pour atteindre une basse pression finale. Il peut y avoir deux ou plus de deux lits d'absorbent primaire et il y aura au moins un lit d'adsorbant secondaire. La séparation préférée est la séparation de dioxyde de carbone d'un flux contenant des hydrocarbures.

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