Enhanced hydrogen recovery from low purity gas streams

Details Enhanced hydrogen recovery from low purity gas streams Enhanced hydrogen recovery from low purity gas streams

1982-04-23

1983-08-16

Spitzer, Robert H.

Gas separation

Means within gas stream for conducting concentrate to collector

55 25, 55 68, 55 75, 55158, 55179, 55389, B01D 5304, B01D 5322

Patent

active

043989268

ABSTRACT:
A high pressure as stream having a hydrogen content of up to about 90 mol percent is passed to a separator containing a permeable membrane capable of selectively permeating hydrogen. The separator is used to achieve a bulk separation of the desired hydrogen from impurities contained in the gas stream. The separated hydrogen is recovered at a reduced pressure and is passed to a pressure swing adsorption system adapted for operation at said reduced pressure. The off-gas from the separator is recovered essentially at the higher pressure of the gas stream. A portion of the off-gas is throttled to a lower pressure, with appropriate power recovery, and is passed to the pressure swing adsorption system as a co-feed gas, thereby contributing to the recovery of purified hydrogen product and to a reduction in the operating costs for the desired hydrogen separation and purification. The remaining off-gas is recovered as a relatively high pressure fuel or feed gas for other purposes.

REFERENCES:
patent: 3324626 (1967-06-01), Dresser et al.
patent: 3367850 (1968-02-01), Johnson
patent: 3430418 (1969-03-01), Wagner
patent: 3986849 (1976-10-01), Fuderer et al.
patent: 4172885 (1979-10-01), Perry
patent: 4229188 (1980-10-01), Intille
patent: 4230463 (1980-10-01), Henis et al.
patent: 4238204 (1980-12-01), Perry
patent: 4255591 (1981-03-01), Makin et al.
Simple Separation Systems for Hydrogen Recovery-Prism Separators by Monsanto.

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