Steam-hydrocarbon reforming with low steam production
AssigneeAir Products and Chemicals, Inc.
InventorsThomas Frommweiler, Sonia Farrokhpanah, David Ross Graham, Michelle Schoonover
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Abstract
A low carbon-emission hydrogen production process may be achieved by first separating carbon dioxide from a reformer syngas stream, followed by separating the carbon dioxide-depleted syngas stream using a semi-permeable membrane to produce a hydrogen-enriched permeate and a hydrogen-depleted retentate. The hydrogen-enriched permeate is purified to produce a hydrogen product and a hydrogen-depleted tail gas stream. The hydrogen-depleted retentate stream may be recycled to the feed and the hydrogen-depleted tail gas stream may be used as fuel in the reformer burners.
Claims10
A process for producing a hydrogen-enriched product stream comprising:
- reacting a reformer feed stream comprising a hydrocarbon feedstock and a reactant selected from the group consisting of water and carbon dioxide in the presence of a reforming catalyst to produce a syngas stream comprising hydrogen, carbon monoxide, and carbon dioxide;
- separating the syngas stream to produce a carbon dioxide-enriched stream and a carbon dioxide-depleted stream;
- separating the carbon dioxide-depleted stream by selective permeation to produce a hydrogen-enriched permeate stream and a hydrogen-depleted retentate stream;
- separating the hydrogen-enriched permeate stream to produce the hydrogen-enriched product stream and a hydrogen-depleted tail gas stream;
- combusting a fuel gas to supply heat to the reaction of the reformer feed stream;
- wherein the fuel gas comprises at least a portion of the hydrogen-depleted tail gas stream.
Dependencies are inferred from the claim text.