Method of recovering a hydrogen enriched product and CO2 in a hydrogen production unit

A method of producing a hydrogen-enriched product and recovering CO2 from an effluent stream of a hydrogen production unit comprising:

• processing a feed stream comprising hydrocarbons or a carbonaceous feedstock in the hydrogen production unit to produce a synthesis gas mixture comprising hydrogen, carbon dioxide, water and at least one of methane, carbon monoxide, nitrogen, and argon;
• separating the effluent stream comprising the synthesis gas in a three-product pressure swing adsorption (PSA) unit that produces at least three product streams into at least a high-pressure hydrogen stream enriched in hydrogen, a hydrogen-depleted low-pressure tail gas stream enriched in carbon dioxide, and a second gas stream, the three-product PSA unit having a three-product PSA cycle, and wherein the second gas stream is produced in a co-current depressurization step in the three-product PSA cycle and has an intermediate pressure between the high-pressure hydrogen stream and the low-pressure tail gas stream;
• compressing the hydrogen depleted low-pressure tail gas stream in a compressor to form a compressed tail gas stream;
• separating the compressed tail gas stream in a CO2 recovery system into a CO2-enriched product stream and an overhead stream comprising a portion of the hydrogen, a portion of the carbon dioxide, and the at least one of the methane, the carbon monoxide, the nitrogen, and the argon;
• and
• recovering the high-pressure hydrogen stream.