Ammonia synthesis gas

Details Ammonia synthesis gas Ammonia synthesis gas

1988-10-05

1991-01-01

Langel, Wayne A.

Chemistry of inorganic compounds

Nitrogen or compound thereof

Ammonia or ammonium hydroxide

252376, C01C 104

Patent

active

049816691

ABSTRACT:
Ammonia synthesis gas is prepared by primary and secondary reforming followed by shift and carbon oxides removal. So that the process can use naphtha and methane, e.g. natural gas, as alternative feedstocks, at least the initial part of the primary reforming catalyst is alkalized. When using a methane feedstock, the primary reformer heating and outlet temperature are reduced compared to when using naphtha, and the amount of air fed to the secondary reformer is increased, so that, after shift, the hydrogen to nitrogen molar ratio of the gas stream is lower and is such that the gas contains an excess of nitrogen. This excess of nitrogen is subsequently removed, e.g. from the ammonia synthesis loop by a cryogenic hydrogen-recovery unit treating a loop purge stream and recovering hydrogen for recycle to the loop.

REFERENCES:
patent: 4298588 (1981-11-01), Pinto
patent: 4479925 (1984-10-01), Shires et al.

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