Gas separation

Details Gas separation Gas separation

1987-07-13

1988-09-20

Mars, Howard T.

Compositions

Gaseous compositions

Nitrogen and hydrogen containing

252374, 252376, C01B 356, C01B 358

Patent

active

047724200

ABSTRACT:
A raw ammonia synthesis gas, preferably containing an excess of nitrogen, is converted to synthesis ready ammonia synthesis gas by two pressure swing adsorption (PSA) stages operated in succession. If the raw gas contains carbon monoxide this is chemically removed, e.g. by methanation, between the PSA stages. In the first PSA stage, CO.sub.2 is removed and waste gas from the second PSA stage is preferably fed back to the first PSA stage for sweeping, purging or repressurizing. In a preferred system the first PSA cycle includes a sweep with CO.sub.2 -rich gas prior to depressurization and purge with second PSA waste gas. In the second PSA stage inert medium boiling gases, and any unwanted nitrogen are removed as the waste gas.

REFERENCES:
patent: 3176444 (1985-04-01), Kiyonaga
patent: 3430418 (1969-03-01), Wagner
patent: 3564816 (1971-02-01), Batta
patent: 3986849 (1976-10-01), Fuderer et al.
patent: 4077779 (1978-03-01), Sircar et al.
patent: 4479925 (1984-10-01), Shires et al.
patent: 4592860 (1986-06-01), Fuderer

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