Selective removal of nitrogen from natural gas by pressure...

B - Operations – Transporting – 01 – D

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B01D 53/00 (2006.01) B01D 53/047 (2006.01)

Patent

CA 2426024

A pressure swing adsorption process for the separation of nitrogen from natural gas utilizes two separate pressure swing adsorption stages, the first containing a hydrocarbon-selective adsorbent and the second containing a nitrogen-selective adsorbent. In the process, the product stream from the first pressure swing adsorption unit contains a natural gas stream having a reduced hydrocarbon content and the product stream from the second pressure swing adsorption unit is a natural gas stream having a reduced nitrogen concentration. The product from the second pressure swing adsorption unit is used to desorb the hydrocarbons from the first pressure swing adsorption unit so as to add the hydrocarbons, which have heat value to the product natural gas stream. Periodically, heating the nitrogen-selective adsorbent with heated product stream from the second pressure swing adsorption unit has been found to improve the capacity of the nitrogen-selective adsorbent to adsorb nitrogen.

L'invention concerne un procédé d'adsorption modulée en pression permettant de séparer l'azote du gaz naturel, qui utilise deux étages séparés d'adsorption modulée en pression, le premier étage contenant un adsorbant sélectif vis-à-vis de l'azote. Dans ce procédé, le flux de produit provenant d'une première unité d'adsorption modulée en pression contient un flux de gaz naturel à contenu réduit en hydrocarbures, et le flux de produit provenant d'une seconde unité d'adsorption modulée en pression est un flux de gaz naturel à concentration réduite en azote. On utilise le produit provenant de la seconde unité d'adsorption modulée en pression pour désorber les hydrocarbures provenant de la première unité d'adsorption modulée en pression de façon à ajouter les hydrocarbures possédant un pouvoir calorifique au flux de gaz naturel. On a découvert que le chauffage périodique de l'adsorbant sélectif vis-à-vis de l'azote à l'aide du flux de produit chauffé provenant de la seconde unité d'adsorption modulée en pression augmente la capacité de l'adsorbant sélectif vis-à-vis de l'azote à adsorber ladite azote.

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