Treatment of ammonia synthesis purge gas

Details Treatment of ammonia synthesis purge gas Treatment of ammonia synthesis purge gas

1976-01-30

1977-11-15

Vertiz, O. R.

Chemistry of inorganic compounds

Nitrogen or compound thereof

Ammonia or ammonium hydroxide

423262, C01C 104

Patent

active

040585891

ABSTRACT:
In the synthesis of ammonia with recycle of unreacted nitrogen and hydrogen to the reactor, a purge gas stream is removed from the recycle stream and partially condensed using refrigeration provided by the expansion and subsequent vaporization of the condensate. After partial condensation the condensate is rich in methane and argon while the gaseous phase is hydrogen enriched. The gaseous stream from the partial condensation is returned to the reactor and a bleed stream is removed from this gaseous stream at a temperature not exceeding 30.degree. C above the subambient temperature of the condensation. At least a part of the bleed stream is then expanded and injected into the expanded condensate prior to vaporization in the refrigeration step. Accumulation of helium, argon and methane impurities in the reactor can thus be prevented and expanded vaporized combined condensate and bleed can be recovered at a suitable pressure for use as a fuel gas stream.

REFERENCES:
patent: 2545778 (1951-03-01), Haringhuizen
patent: 3350170 (1967-10-01), Finneran et al.
patent: 3721098 (1973-03-01), Forg et al.

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