Production of ammonia synthesis gas

Details Production of ammonia synthesis gas Production of ammonia synthesis gas

C - Chemistry, Metallurgy

10

K

48/46

C10K 1/08 (2006.01) C01B 3/02 (2006.01) F25J 3/02 (2006.01) F25J 3/06 (2006.01)

Patent

CA 1230488

ABSTRACT A process for removal of excess nitrogen and carbon oxides from a raw synthesis gas used to make ammonia. The raw synthesis gas is divided into two portions. The first portion is methanated to remove carbon oxides and then cooled to condense part of its nitrogen content. The con- densed nitrogen is fed to the top of a nitrogen wash col- umn. The second portion of the raw synthesis gas is pas- sed over an absorbent which removes carbon dioxide and water vapor. It is then cooled to condense excess nitro- gen. The remaining gas is fed to the bottom of an nitro- gen wash column where it is washed free of carbon monoxide by the nitrogen condensed from the methanated gas stream.

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