Refrigeration – Processes – Circulating external gas
Patent
1984-02-23
1985-10-01
Sever, Frank
Refrigeration
Processes
Circulating external gas
62 31, 62 34, 62 39, F25J 302
Patent
active
045443904
ABSTRACT:
An improved cryogenic separation process is provided for forming a substantially CO-free and lower hydrocarbon-free hydrogen-rich gas, suitable for use in producing an ammonia synthesis gas, from a hydrogen-containing gas stream also containing carbon monoxide and lower hydrocarbon impurities, wherein the hydrogen containing gas is subject to a two-stage autorefrigerated cryogenic flash treatment to remove concentrated methane-containing and carbon monoxide-containing streams, and the thus-purified hydrogen gas is passed to a nitrogen wash tower in counter-current contact with liquid nitrogen to form the desired hydrogen-rich product streams as an overheads from the wash tower.
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A. Joly and R. Clar, "New Integrated Cryogenic Units for Ammonia Synthesis", Nitrogen, No. 52, pp. 30-43 (Mar./Apr. 1968).
M. Venkataratnam and T. S. N. Murty, "Production of Synthesis Gas Mixture From Converted Gas For Ammonia Manufacture-Different Cycles/Schemes", Indian J. Cryog., pp. 1-6 (1982).
Exxon Research & Engineering Co.
Murray, Jr. Jack B.
Sever Frank
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