TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: The process involves feeding sweep gas comprising nitrogen and/or steam to permeate side of membrane of membrane separation unit; and feeding shifted synthesis gas stream to membrane separation unit(s) at 0-50, preferably 20-40 degrees C. The shifted synthesis gas stream is fed to membrane separator unit(s) at 75-400, preferably 100-300 degrees C and 60 bar, where CO2 enriched retentate stream that is removed from membrane separation unit(s) is cooled downstream of membrane separation unit(s) before retentate stream enters CO2 condensation plant. The CO2 enriched retentate stream is passed to pre-cooling heat exchanger of CO2 condensation plant, where retentate stream is pre-cooled to 0-10 degrees C. The CO2 condensation plant comprises 4-8 cryogenic separation stages that are arranged in series, where CO2 enriched retentate stream is fed to first cryogenic separation stage in series, and H2 enriched vapor stream having CO2 content of less than 10 mol.% is withdrawn from cryogenic stage in the series. The H2 enriched vapor stream that is withdrawn from separator vessel of intermediate cryogenic separation stage has H2 content of at least 40, preferably at least 50 mol.%. The H2 enriched vapor stream from final cryogenic separation stage of CO2 condensation plant comprises at least 90, preferably, at least 99 mol.% H2. Preferred Components: The H2 enriched permeate stream is less than 2 mol.%. The CO2 content of CO2 enriched retentate stream is 70-85 mol.%.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The external refrigerant is propane, ethane, ethylene, ammonia, hydrochlorofluorocarbons and mixed refrigerants comprising at least two refrigerants consisting of butanes, propanes, ethane, and/or ethylene. The carbon dioxide enriched retentate stream has CO2 content of at least 70 mol.%.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The H2 selective membrane is polybenzimidazole (PBI)-based polymeric membranes comprising PBI-based polymeric selective layer coated onto porous metallic substrate, or porous polymeric substrate. Preferred Properties: The H2 selective membrane that is employed in membrane separator unit(s) has hydrogen selectivity (over CO2) of greater than 20, preferably greater than 40. EXAMPLE - No suitable example given.