METHOD AND DEVICE FOR SEPARATING A MIXTURE OF HYDROGEN, METHANE AND CARBON MONOXIDE BY CRYOGENIC DISTILLATION

摘要

The invention relates to a method for separating by cryogenic distillation a mixture containing hydrogen, methane and carbon monoxide, in which the mixture is cooled down and at least a portion is fed into a liquid-CO scrubbing column (5), a head gas (7) of the scrubbing column is collected, the liquid of the scrubbing column tank is fed, optionally after purification, to a CO/CH4 separation column (33), a CO-rich liquid (47, 59) is collected from the CO/CH4 separation column, then pressurised (49) and fed to the head of the scrubbing column, a cycle is used for providing at least a portion of the frigories, and a methane-rich liquid (39) is collected at the tank of the CO/CH4 separation column as the end product (45).