Method and device for cryogenically separating a mixture of hydrogen and carbon monoxide

摘要

A process and a device for the cryogenic separation of a mixture of hydrogen and carbon monoxide, in particular of a mixture having, as main components, hydrogen and carbon monoxide is presented.

主权项

1. A process for the cryogenic separation of a mixture of hydrogen and carbon monoxide for the production of pure CO, the process comprising the steps of:
cooling the mixture by a single stage of partial condensation in an exchange line; introducing at least a portion of liquid resulting from the partial condensation into the top of a stripping column; withdrawing at least a first flow rich in carbon monoxide and a second flow each in carbon momoxide from the stripping column in the liquid form and introducing to the exchange line, the exchange line configured to cool the first flow and the second flow to different temperatures; removing the first flow from the exchange line and expanding the first flow; introducing the expanded first flow to a separator pot, thereby producing a first vapor and a first liquid; reheating the first liquid in the exchange line and reintroducing the first liquid to the separator pot; heating the first vapor in the exchange line before introducing the first vapor to the first stage of a carbon monoxide compressor comprising at least two stages; removing the second flow from the exchange line and expanding the second flow; introducing the expanded second flow to the exchange line for heating before introducing the expanded second flow; to a stage of the carbon monoxide compressor downstream of the first stager, wherein the first vapor and the second flow are introduced to the exchange line at different pressures, wherein the expansion of the first liquid and the second flow provide at least a portion of the separation energy.