Hydrogen adsorption purification method with co-generation...

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B01D 53/047 (2006.01) B01D 53/08 (2006.01) C01B 3/56 (2006.01)

Patent

CA 2671389

The invention relates to a method for producing very high purity hydrogen from a load predominantly containing said hydrogen as well as a minor portion of impurity essentially consisting of carbon dioxide, carbon monoxide, methane and heavier hydrocarbons. The hydrogen-adsorption purification method includes a desorption step at a pressure lower than the load pressure, such as a PSA method, and can be used for producing the desorption flow and mainly for recovering the pressurised carbon dioxide and the high-purity hydrogen with a high yield. This performance is achieved by associating the successive steps of the method of the invention with the use of a new family of adsorbents whose dynamic capacity at a high desorption pressure is higher than that of traditional adsorbents.

La présente invention porte sur un procédé de production d'hydrogène à très haute pureté à partir d'une charge contenant majoritairement ledit hydrogène et une mineure partie d'impuretés principalement constituées de dioxyde de carbone, monoxyde de carbone, méthane et hydrocarbures plus lourds. Le procédé de purification par adsorption de l'hydrogène employant une étape de désorption à pression plus faible que la pression de la charge, tel qu'un procédé PSA par exemple, permet de produire le flux de désorption et notamment de récupérer le dioxyde de carbone en pression et de l'hydrogène à haute pureté et avec un rendement élevé. Ces performances sont obtenues en associant les étapes successives du procédé selon l'invention à l'utilisation d'une nouvelle famille d'adsorbant, dont la capacité dynamique à une pression de désorption élevée est supérieure à celle des adsorbants classiques.

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