Gas separation process

Details Gas separation process Gas separation process

1987-04-28

1988-03-22

Warner, Steven E.

Refrigeration

Processes

Circulating external gas

55 25, 55 68, 55 74, F25J 302

Patent

active

047325968

ABSTRACT:
Hydrogen and carbon monoxide are each separately recovered in high yield from a multicomponent gas stream containing these compounds together with carbon dioxide and a zero to minor amount of one or more gaseous components from the group consisting of nitrogen, methane, water vapor and C.sub.2 -C.sub.6 hydrocarbons, by a process wherein the multicomponent gas stream, such as that obtained by steam methane reforming, is initially treated in a pressure swing adsorption unit to remove water and CO.sub.2, and the obtained effluent freed of CO.sub.2 and water is then further subjected to (1) cryogenic fractionation to condense CO and to (2) hydrogen purification by selective adsorption (in either order) to recover high purity carbon monoxide and essentially pure hydrogen. The CO.sub.2 -laden adsorbent is regenerated by purging with a H.sub.2 O and CO.sub.2 -free waste gas stream from the hydrogen purification adsorbent bed or from the cryogenic fractionation or from both of these.

REFERENCES:
patent: 3359744 (1967-12-01), Bolez et al.
patent: 3838553 (1974-10-01), Doherty
patent: 3986849 (1976-10-01), Fuderer et al.
patent: 4171206 (1979-10-01), Sircar
patent: 4194890 (1980-03-01), McCombs et al.
patent: 4375363 (1983-03-01), Fuderer
patent: 4671893 (1987-06-01), Pinto

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