The device (100) for cooling a flow (101) of a target fluid predominantly comprising dihydrogen, comprises: a first heat exchanger (105) configured to cool an intermediate refrigerant fluid (110) by heat exchange with an expanded dioxygen flow (115), an intermediate closed circuit (120) for transporting the intermediate refrigerant fluid from the first heat exchanger to a second heat exchanger (125), a means (130) for compressing the intermediate refrigerant fluid along the intermediate closed circuit, the intermediate refrigerant fluid, configured to remain in the liquid or supercritical state at least upon passing through the compression means and the second heat exchanger configured to cool the target fluid flow by heat exchange with the intermediate refrigerant fluid cooled in the first heat exchanger.

The invention relates to a method and also a device for producing a gas product, wherein a first gas stream is combined with a second gas stream and the first gas stream that is present at a lower output pressure than the second gas stream is fed to a mechanical compressor in order to be compressed to the preset pressure of the gas product. It is characteristic in this case that the pressure of the first gas stream is elevated using a gas jet compressor arranged upstream of the mechanical compressor, to which gas jet compressor at least a part of the second gas stream is fed as pumping medium.

A unit for separating a mixture of carbon monoxide, hydrogen and methane by cryogenic distillation including a distillation column having a condenser and a reboiler, a refrigeration cycle having a compressor, a first heat exchanger, a second heat exchanger, means for sending the gas mixture to be cooled in the first heat exchanger, means for separating the gas mixture cooled in the first heat exchanger and for sending a fluid produced by the separation to the distillation column, a thermally insulated enclosure containing the first and second heat exchangers, means for sending a cycle gas from the distillation column to the second heat exchanger and then to the first heat exchanger to be heated, means for sending a cycle gas liquefied in the reboiler to be cooled in the second heat exchanger, and means for sending the cycle gas liquefied and cooled in the second heat exchanger to the condenser.