초록 ▼

A process for producing hydrogen gas by reacting steam with a gas mixture containing carbon monoxide, carbon dioxide and hydrogen to produce a hydrogen-enriched product gas and subjecting the product gas to pressure swing adsorption to produce a high purity hydrogen product and a hydrogen-depleted w

A process for producing hydrogen gas by reacting steam with a gas mixture containing carbon monoxide, carbon dioxide and hydrogen to produce a hydrogen-enriched product gas and subjecting the product gas to pressure swing adsorption to produce a high purity hydrogen product and a hydrogen-depleted waste gas is improved by drying, where necessary, part of the gas mixture and subjecting the dry gas mixture to pressure swing adsorption using a carbon monoxide-selective adsorbent to produce a high purity carbon monoxide product gas and a carbon monoxide-depleted waste gas. Where the gas mixture is produced by endothermic reaction, one or both of the hydrogen-depleted waste gas and the carbon monoxide-depleted waste gas can be used as fuel to supply heat for the endothermic reaction.

대표청구항 ▼

[ What is claimed is:] [1.] In a process for producing hydrogen by reacting a gas mixture comprising hydrogen, carbon monoxide, carbon dioxide and 0 to about 10% by volume methane with steam, thereby causing at least part of said carbon monoxide to react with said steam to produce a hydrogen-enriche

[ What is claimed is:] [1.] In a process for producing hydrogen by reacting a gas mixture comprising hydrogen, carbon monoxide, carbon dioxide and 0 to about 10% by volume methane with steam, thereby causing at least part of said carbon monoxide to react with said steam to produce a hydrogen-enriched intermediate stream, and subjecting said hydrogen-enriched intermediate stream to a hydrogen pressure swing adsorption process comprising an adsorption step and an adsorbent regeneration step using a carbon dioxide-selective adsorbent, thereby producing a high purity hydrogen product stream and a first waste gas enriched in carbon dioxide or carbon dioxide and methane, the improvement comprising:(a) passing part of the said gas mixture through at least one adsorption vessel at superatmospheric pressure, said at least one adsorption vessel containing an adsorbent which most strongly adsorbs carbon monoxide and least strongly adsorbs hydrogen from said dried gas mixture, thereby producing a nonadsorbed hydrogen-enriched gas and a carbon monoxide-enriched adsorbed phase;(b) partially depressurizing said at least one adsorption vessel, thereby producing a second waste gas stream enriched in carbon dioxide or carbon dioxide and methane;(c) further depressurizing said at least one adsorption vessel, thereby producing a carbon monoxide-enriched product gas; and(d) recycling said nonadsorbed hydrogen-enriched gas to said hydrogen-enriched intermediate stream.