Pressure swing adsorption process

B - Operations – Transporting – 01 – D

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Details

B01D 53/047 (2006.01) C01B 21/04 (2006.01) C07C 7/13 (2006.01) C10L 3/10 (2006.01)

Patent

CA 2439146

A pressure swing adsorption process for the separation of nitrogen from a mixture of same with methane, utilizing two separate PSA stages, one containing a nitrogen selective adsorbent and the second containing a methane- selective adsorbent. In the process, the first PSA unit containing a nitrogen selective adsorbent forms a product methane stream and a waste stream rich in nitrogen which is passed to a second PSA unit containing a methane selective adsorbent which forms a product nitrogen stream and a waste stream rich in methane. The waste stream rich in methane can be treated to remove heavy hydrocarbons therefrom before the methane is recycled to feed.

La présente invention concerne un procédé d'adsorption modulée en pression permettant de séparer de l'azote d'un mélange d'azote et de méthane, au moyen de deux unités AMP; l'une de ces unités contenant un absorbant sélectif d'azote, et l'autre un absorbant sélectif de méthane. Dans ce procédé, la première unité AMP contenant l'absorbant sélectif d'azote est conçue pour former un courant de méthane produit et un courant de déchets riche en azote acheminé vers une seconde unité AMP qui contient un absorbant sélectif de méthane formant un courant d'azote produit et un courant de déchets riche en méthane. Le courant de déchets riche en méthane peut être traité afin d'éliminer les hydrocarbures lourds avant que le méthane ne soit recyclé en charge.

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