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

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

B - Operations, Transporting

01

D

B01D 53/047 (2006.01) B01D 53/54 (2006.01) C10L 3/10 (2006.01)

Patent

CA 2671307

This invention provides a pressure swing adsorption (PSA) process for the separation of nitrogen from a mixture of the same with methane which comprises: a) passing a feed stream comprising said mixture in contact with a nitrogen-selective sorbent in a PSA unit so as to preferentially adsorb nitrogen and produce a methane-rich product stream containing at least 70 mol. % methane and a low pressure purge stream having a higher molar concentration of nitrogen than said mixture; and (b) subsequent to step (a), periodically heating said nitrogen-selective sorbent with the methane-rich product stream to drive off accumulated methane from the sorbent.

Cette invention concerne un procédé d'adsorption modulée en pression (PSA) permettant l'extraction d'azote d'un mélange constitué par cet azote et par du méthane, qui comprend : a) le passage d'un courant d'alimentation comprenant ledit mélange en contact avec un sorbant sélectif en azote dans une unité PSA afin d'adsorber préférentiellement l'azote et de produire un flux de produit riche en méthane contenant au moins 70 mol. % de méthane et d'un flux de purge à basse pression ayant une plus forte concentration molaire d'azote que ce mélange, et (b) à la suite de l'étape (a), le chauffage périodique dudit sorbant sélectif en azote à l'aide du flux de produit riche en méthane pour chasser le méthane accumulé du sorbant.

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