TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Process: The internal refrigerant stream is generated by: expanding a liquid carbon dioxide stream that is produced in the process to lower pressure through a Joule-Thomson valve for forming a cooled two phase stream; passing the cooled two phase stream to a separator vessel, where a vapor phase comprising gaseous carbon dioxide separates from a liquid phase comprising liquid carbon dioxide; and withdrawing a cooled liquid carbon dioxide stream from the gas-liquid separator and employing this liquid carbon dioxide stream as internal refrigerant. The hydrogen enriched vapor stream that is withdrawn from the separator vessel of an intermediate cryogenic separation stage has a hydrogen content of 50 mol.% and the hydrogen enriched vapor stream is passed to a membrane separation unit of the carbon dioxide condensation plant, where a hydrogen selective membrane is used to separate a hydrogen enriched permeate stream from a carbon dioxide enriched retentate stream. The carbon dioxide enriched retentate stream from the membrane separation unit of the carbon dioxide condensation plant is used as feed to a further cryogenic separation stage of the carbon dioxide condensation plant. The hydrogen enriched vapor stream from the final cryogenic separation stage of the carbon dioxide condensation plant comprises 99 mol.% of hydrogen. The carbon dioxide condensation plant comprises cryogenic separation stages that are arranged in series, where each cryogenic separation stage comprises a heat exchanger and a gas-liquid separation vessel and the carbon dioxide enriched retentate stream is fed to the first cryogenic separation stage in the series. The carbon dioxide condensation plant comprises 4-8 cryogenic separation stages arranged in series. The internal refrigerant stream is employed as refrigerant in the heat exchanger of each cryogenic separation stage. The carbon dioxide condensation plant comprises a cryogenic separation stage having a heat exchanger that employs an external refrigerant upstream of the cryogenic separation stage having a heat exchanger that employs an internal refrigerant.