PROCESS FOR GENERATING AND SEPARATING A HYDROGEN-CARBON MONOXIDE MIXTURE BY CRYOGENIC DISTILLATION

摘要

In a process for generating and separating a syngas, a syngas (15) containing less than 2.3% methane is generated from a feed gas, the syngas containing hydrogen and carbon monoxide is purified by at least one treatment process (17, 21) in order to produce a purified syngas (23), and the syngas is separated by cryogenic distillation in a plant (25) comprising at least one methane scrubbing column (29) in order to produce a hydrogen-enriched gas (39, 41) and/or a carbon monoxide-enriched gas (55), and the syngas is enriched upstream of the cryogenic distillation separation in order to obtain a syngas comprising more than 2.3% methane by sending a portion (11) of the feed gas to a treatment process downstream of the syngas generation step (15), without passing via the syngas generation unit.