Integrated hydrogen production and carbon dioxide recovery process

An integrated process for hydrogen production and carbon dioxide recovery comprising:

• introducing a feed stream comprising hydrocarbons or a carbonaceous feedstock to a synthesis gas production zone comprising a syngas reactor to produce a synthesis gas stream comprising hydrogen, carbon dioxide, carbon monoxide, and methane;
• separating the synthesis gas stream in a hydrogen pressure swing adsorption (PSA) unit to form a high-pressure hydrogen product stream enriched in hydrogen and a hydrogen-depleted tail gas stream;
• compressing and drying the hydrogen-depleted tail gas stream to form a dried compressed tail gas stream;
• chilling a working fluid stream with a chilling stream comprising liquefied natural gas, or liquid nitrogen, or liquid ammonia, or liquid hydrogen, or combinations thereof in a first heat exchanger forming a chilled working fluid stream and a warmed chilling stream;
• chilling the dried compressed tail gas stream with the chilled working fluid stream in a main heat exchanger in a cryogenic carbon dioxide separation unit forming a chilled dried hydrogen-depleted tail gas stream and a warmed working fluid stream, and separating the chilled hydrogen-depleted tail gas stream into a carbon dioxide product stream comprising carbon dioxide, and an overhead stream;
• passing the warmed working fluid stream to the first heat exchanger;
• separating the overhead stream in an overhead separation unit to form a low-pressure carbon dioxide stream enriched in carbon dioxide and an off-gas stream enriched in hydrogen and at least one of carbon monoxide and methane;
• and
• optionally recycling the low-pressure carbon dioxide stream to the cryogenic carbon dioxide separation unit.