TRATTAMENTO DEL GAS DI SPURGO NELLA SINTESI DELLA AMMONIACA

摘要

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.