Hydrogen generation and recovery

Details Hydrogen generation and recovery Hydrogen generation and recovery

1987-04-15

1989-09-26

Doll, John

Chemistry of inorganic compounds

Hydrogen or compound thereof

Elemental hydrogen

55 26, 55 58, 423652, C01B 113

Patent

active

048698946

ABSTRACT:
High yields of hydrogen of high purity are obtained from a methane-rich gas stream, such as natural gas, by a particular combination of operations wherein the methane-rich gas undergoes primary steam reforming under less severe operating conditions including lower steam to carbon ratio, supplemented by secondary reforming with oxygen, the obtained hydrogen is separated from accompanying carbon dioxide in the reformer effluent by a special five step pressure swing adsorption sequence having the steps of selective CO.sub.2 adsorption at superatmospheric pressure, rinsing with desorbed carbon dioxide, depressuring and then evacuating without additional rinsing, followed by repressuring the bed with part of the recovered pure hydrogen.

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patent: 4592860 (1986-06-01), Fuderer
patent: 4599094 (1986-07-01), Werner et al.
patent: 4778670 (1988-10-01), Pinto

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