method and apparatus for rueckgewinnung of hydrogen and argon in the reinigungsgas the ammoniaksynthese.

摘要

The power consumed in recovering argon from ammonia synthesis purge gas is substantially reduced by a process which includes the steps of scrubbing (2) the gas to remove ammonia, drying (3) the gas to remove water vapour, expanding (5) the gas and introducing the expanded gas into a cryogenic separation unit (6) which provides a hydrogen rich product stream and a substantially pure argon stream. In the preferred embodiment, the use of a generator loaded expander (5) reduces the power consumed per tonne of argon recovered from 1175 kw to 600 kw.