Purification of gas mixtures

Details Purification of gas mixtures Purification of gas mixtures

C - Chemistry, Metallurgy

01

B

23/220, 23/314

C01B 3/02 (2006.01) C01B 3/58 (2006.01)

Patent

CA 1152293

A B S T R A C T The invention concerns a process for the purification of a hydrogen-containing gas mixture comprising up to 45% by volume of hydrogen, together with carbon oxides, hydrogen cyanide and impurities including nitrogen oxides and/or oxygen. The process comprises passing the gas over a sulphur-resistant hydrogenation catalyst at a temperature of from 120°C to 250°C and at a pressure of from 0,5 to 250 bar to remove the nitrogen oxides and/or oxygen therefrom while substantially avoiding hydrogen cyanide removal. The gas may be obtained from a Koppers-Totzek gasifier and may be used for the production of ammonia after further purifi- cation. The sulphur-resistant catalyst may be a nickel molybdate or cobalt molybdate catalyst or a metal from Group VI and/or Group VIII of the Periodic Table.

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