Method and apparatus for producing high-purity hydrogen

Details Method and apparatus for producing high-purity hydrogen Method and apparatus for producing high-purity hydrogen

2007-11-06

2007-11-06

Wilkins, III, Harry D (Department: 1753)

Electrolysis: processes, compositions used therein, and methods

Electrolytic synthesis

Preparing nonmetal element

Reexamination Certificate

active

10623159

ABSTRACT:
High-purity hydrogen is recovered from a pyrolysis gas, composed mainly of hydrogen and carbon monoxide, produced by pyrolysis of an organic material such as biomass. A method for producing such high-purity hydrogen includes supplying a reducing gas produced by pyrolysis of an organic material to an anode side of a high-temperature steam electrolyzer having a diaphragm comprising solid oxide electrolyte; and supplying steam to a cathode side of the high-temperature steam electrolyzer to produce hydrogen and oxygen by electrolytic action. The oxygen produced in the cathode side of the high-temperature electrolyzer passes through the diaphragm and reacts with the reducing gas to create concentration gradient of oxygen ion, thus lowering electrolysis voltage.

REFERENCES:
patent: 4229184 (1980-10-01), Gregg
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patent: 4953479 (1990-09-01), Keller et al.
patent: 6051125 (2000-04-01), Pham et al.
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patent: 51-119703 (1976-10-01), None
patent: 51-142872 (1976-12-01), None
patent: 51-142873 (1976-12-01), None
Derwent abstract of JP 51-119703 A.
Translation of JP 51-119703 A.

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