Cyrogenic separation of synthesis gas

C - Chemistry – Metallurgy – 01 – B

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C01B 3/50 (2006.01) C01B 31/18 (2006.01) F25J 3/02 (2006.01)

Patent

CA 2757011

A process and apparatus for separating a feed containing hydrogen, carbon monoxide, methane, and optionally nitrogen to form a product gas having a desired H2:CO molar ratio and optionally a hydrogen product gas and a carbon monoxide product gas. The feed is partially con- densed to form a hydrogen-enriched vapor fraction and a carbon monox-ide-enriched liquid fraction. The hydrogen-enriched vapor fraction and carbon monoxide-enriched liquid fraction are combined in a regulated manner to form an admixture, which is cryogenically separated to form the product mixture having the desired H2:CO molar ratio.

La présente invention concerne un procédé et un appareil destinés à séparer une charge d'alimentation contenant de l'hydrogène, du monoxyde de carbone, du méthane et éventuellement de l'azote pour former un produit gazeux présentant un rapport molaire H2:CO souhaité et éventuellement un produit de type hydrogène gazeux et un produit de type monoxyde de carbone gazeux. La charge d'alimentation est partiellement condensée pour former une fraction vapeur enrichie en hydrogène et une fraction liquide enrichie en monoxyde de carbone. La fraction vapeur enrichie en hydrogène et la fraction liquide enrichie en monoxyde de carbone sont combinées d'une manière régulée pour former un mélange, qui est séparé par cryogénie pour former le mélange produit présentant le rapport molaire H2:CO souhaité.

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