Treatment of ammonia synthesis purge gas

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

1979-10-10

1981-03-10

Carter, Herbert T.

Chemistry of inorganic compounds

Nitrogen or compound thereof

Ammonia or ammonium hydroxide

55 23, 55 27, 55 66, B01D 5100, C01C 104

Patent

active

042554063

ABSTRACT:
A process is disclosed for recovering hydrogen from an ammonia synthesis plant comprising
(a) cooling a high pressure stream of said purge gas to a sub-ambient temperature at which substantially all of the methane and argon contained in said purge gas stream and a portion of the nitrogen condense,
(b) expanding liquid and vapor components of the cooled high pressure stream to an intermediate pressure,
(c) phase separating liquid and vapor components of the cooled and expanded purge gas stream,
(d) expanding separated liquid component from step (c), and
(e) heating expanded separated liquid component from step (d) and separated vapor component from step (c) in heat exchange with said high pressure stream of purge gas to cool the latter.

REFERENCES:
patent: 3721098 (1973-03-01), Forg et al.
patent: 4058589 (1977-11-01), Haslam

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