Process For Hydrogen Production With Low Carbon Dioxide Emission

Abstract: The invention relates to a process for producing a hydrogen product where a carbon-containing input (1), by reforming (A, D) and water gas shift (S), is converted into a synthesis gas (4) largely consisting of hydrogen and carbon dioxide, from which a hydrogen fraction (13) and a carbon dioxide fraction (9) are separated, wherein the hydrogen fraction (13) has the composition required for the hydrogen product (13) and the carbon dioxide fraction (9) has a purity which allows delivery thereof as a product or disposal thereof through sequestration. The characterizing feature here is that the synthesis gas consisting largely of hydrogen and carbon dioxide, by means of a first pressure swing adsorber (PSA1), is fractionated into a carbon dioxide-depleted first PSA high-pressure fraction (6, 6') and a carbon dioxide-enriched first PSA low-pressure fraction (5, 5'), from which, after compression (P), the carbon dioxide fraction (9) is obtained by cryogenic gas fractionation (C).

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