Method and apparatus for separating hydrogen gas

C - Chemistry – Metallurgy – 01 – B

Patent

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C01B 3/56 (2006.01) B01D 53/04 (2006.01) B01J 20/18 (2006.01) B01J 20/20 (2006.01)

Patent

CA 2667051

A method of separating hydrogen gas in which a hydrogen-containing gaseous mixture is treated by the pressure swing adsorption method with adsorption columns (A), (B), and (C) packed with adsorbents, in order to separate hydrogen gas from the gaseous mixture. The method comprises repetitions of a cycle comprising: an adsorption step in which a gaseous mixture is introduced into an adsorption column to adsorb an unnecessary gas contained in the gaseous mixture onto the adsorbents and a product gas having a high hydrogen concentration is discharged from the adsorption column; and a desorption step in which the unnecessary gas is desorbed from the adsorbents and desorbed gases comprising a gas remaining in the adsorption column and the unnecessary gas are discharged from the adsorption column. The adsorbents comprise a first adsorbent (D), which is an activated-carbon adsorbent located upstream in the gaseous-mixture flow direction in the adsorption column, and a second adsorbent (E), which is a zeolite adsorbent located downstream in the flow direction, the proportions of packing with the first and second adsorbents being 60-80% and 40-20%, respectively.

L'invention concerne un procédé de séparation de gaz d'hydrogène. Selon ce procédé, un mélange gazeux contenant de l'hydrogène est traité par le procédé d'adsorption modulée en pression avec les colonnes d'adsorption (A), (B), et (C) garnies d'adsorbants, de manière à séparer le gaz d'hydrogène du mélange gazeux. Le procédé comprend des répétitions d'un cycle comprenant : une étape d'adsorption dans laquelle un mélange gazeux est introduit dans une colonne d'adsorption pour adsorber un gaz non nécessaire contenu dans le mélange gazeux sur les adsorbants et un produit gazeux ayant une grande concentration en hydrogène est déchargé de la colonne d'adsorption; et une étape de désorption dans laquelle le gaz non nécessaire est désorbé des adsorbants et les gaz désorbés comprenant un gaz restant dans la colonne d'adsorption et le gaz non nécessaire sont déchargés de la colonne d'adsorption. Les adsorbants comprennent un premier adsorbant (D), qui est un adsorbant de charbon actif situé an amont dans le sens d'écoulement du mélange gazeux dans la colonne d'adsorption, et un second adsorbant (E), qui est un adsorbant de zéolite situé en aval dans le sens d'écoulement, les proportions de garnissage avec les premier et second adsorbants étant de 60 à 80 % et de 40 à 20 %, respectivement.

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