METHOD AND APPARATUS FOR DISTILLATION AT SUBAMBIAN TEMPERATURE

摘要

In a process for separating a gaseous mixture containing a heavy component and a light component at a subambient temperature, at least a portion of the gaseous mixture is cooled in an exchanger (19) and at least a portion of the cooled gaseous mixture is separated into forming a gas enriched with a light component, at least a first liquid (17) enriched with a heavy component and at least a second liquid (13) enriched with a heavy component, the first liquid is subcooled in the exchanger, the first liquid to a first pressure and is vaporized at the first pressure in the exchanger and does not subcool the second liquid in the exchanger and vaporizes the second liquid in the exchanger, without having relaxed, at a second pressure, higher than the first pressure.