Abstract
The recent development of the protonic membrane reformer (PMR) technology allows an energy efficient hydrogen production from natural gas. To liquefy and separate CO2 from the retentate gas of the PMR, various low temperature processes are modelled and compared. The optimization results indicate that the single mixed refrigerant based process gives the smallest power consumption and fewest number of units. The cascade and the self-liquefaction processes can be considered as alternatives when the retentate gas is rich and lean in CO2 respectively. © 2020 Elsevier B.V.