| 摘要 |
An improved cryogenic separation process is provided for forming a substantially CO-free and lower hydro-carbon-free hydrogen-rich gas 13, suitable for use in producing an ammonia synthesis gas 14, from a hydrogen-containing gas stream 10 also containing carbon monoxide and lower hydrocarbon impurities, wherein the hydrogen containing gas 10 is subject to a two-stage autorefrigerated cryogenic flash treatment (60 and 80) to remove concentrated methane-containing and carbon monoxide-containing streams (11 and 12), and the thus-purified hydrogen gas 18 is passed to a nitrogen wash tower 100 in counter-current contact with liquid nitrogen 109 to form the desired hydrogen-rich product stream as an overheads 102 from the wash tower 100. |
