Hydrogen and carbon dioxide coproduction

Details Hydrogen and carbon dioxide coproduction Hydrogen and carbon dioxide coproduction

1988-05-04

1990-10-16

Langel, Wayne A.

Chemistry of inorganic compounds

Carbon or compound thereof

Oxygen containing

55 26, 55 62, 55 68, 422190, 422198, 423650, B01D 5304, C01B 324, C01B 3120

Patent

active

049633392

ABSTRACT:
Highly purified gaseous hydrogen and liquid carbon dioxide are produced from a steam reformer/shift converter by passing the effluent from the latter through a multibed hydrogen PSA unit followed by an uncoupled carbon dioxide PSA unit. The carbon dioxide PSA unit produces a hydrogen-rich stream which is recycled to the feed to the steam reformer, a carbon dioxide-rich recycle stream which is recycled to the carbon dioxide PSA unit feed and a carbon dioxide-rich product stream which is introduced under pressure to a liquifier. A waste stream from the liquifier is recylced to the carbon dioxide PSA unit feed. A portion of the carbon dioxide-rich product stream is withdrawn from the compressor at a stage such that its pressure is higher than that of the carbon dioxide PSA unit and returned thereto as a cocurrent purge preceding bed regeneration to obtain product.

REFERENCES:
patent: Re31014 (1982-07-01), Sircar
patent: 2477738 (1949-08-01), Getz
patent: 3643451 (1972-02-01), Foucar
patent: 4460395 (1984-07-01), Nobles et al.
patent: 4726816 (1988-02-01), Fuderer
patent: 4778670 (1988-10-01), Pinto
patent: 4869894 (1989-09-01), Wang et al.
Kirk-Othmer, Encyclopedia of Chemical Technology, Third Edition, vol. 4, John Wiley & Sons (1978) pp. 725, 737, 738.

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