Recovery of krypton and xenon

摘要

A method for recovering krypton and xenon from air comprises (a) separating an air feed stream into oxygen-enriched and nitrogen-enriched product streams; (b) reacting the oxygen-rich product stream with a hydrocarbon feed in a synthesis gas generation process to yield a synthesis gas stream comprising hydrogen, carbon oxides, krypton, and xenon, which synthesis gas stream contains essentially no oxygen; (c) introducing the synthesis gas stream into a synthesis gas conversion process and converting the synthesis gas stream into a liquid synthesis product stream and an unreacted synthesis gas stream; (d) recycling at least a portion of the unreacted synthesis gas stream to the synthesis gas generation process; (e) reducing the pressure of the liquid synthesis product stream to yield a two-phase reduced-pressure product stream, and separating the two-phase reduced-pressure product stream into a final liquid synthesis product stream and a gas stream enriched in krypton and xenon; and (f) separating the gas stream enriched in krypton and xenon into a purge gas stream and a gas product stream further enriched in krypton and xenon.