Method for treating a gas mixture by adsorption

B - Operations – Transporting – 01 – D

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Details

B01D 53/04 (2006.01) B01D 53/047 (2006.01) C01B 3/50 (2006.01) C01B 3/56 (2006.01) C01B 31/18 (2006.01)

Patent

CA 2443233

The gas mixture comprises at least a main constituent to be produced and impurities to be separated from said mixture. The treatment method consists in using at least two adsorbers which follow in offset manner a common cycle during which there are successively an adsorption phase and a regeneration phase using a regenerating gas. Furthermore, it consists in subjecting at the beginning of the adsorption phase (steps I or IV) and/or at the beginning of the use of regenerating gas (step VI), to only part of the gas mixture flow to be treated, respectively the regenerating gas flow, until said adsorber is saturated, respectively substantially discharged, in at least one of the main constituents to be produced, while maintaining at least another adsorber in adsorption phase. The invention is useful for treating a mixture rich in carbon monoxide and hydrogen.

Le mélange gazeux comporte au moins un constituant principal à produire et des impuretés à séparer dudit mélange. Dans le procédé de traitement, on utilise au moins deux adsorbeurs qui suivent chacun en décalage un même cycle durant lequel se succèdent une phase d'adsorption et une phase de régénération utilisant un gaz de régénération. De plus, on soumet chaque adsorbeur en début de phase d'adsorption (étapes I ou IV) et/ou en début d'utilisation du gaz de régénération (étape VI), à seulement une partie du débit du mélange gazeux à traiter, respectivement du débit du gaz de régénération, jusqu'à ce que ledit adsorbeur soit saturé, respectivement soit sensiblement déchargé, en au moins un des constituants principaux à produire, tout en maintenant au moins un autre adsorbeur en phase d'adsorption. Application au traitement d'un mélange riche en monoxyde de carbone et en hydrogène.

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