Process for the production of ammonia synthesis gas with improved cryogenic purification

摘要

A process and related equipment for producing ammonia synthesis gas are disclosed, wherein a raw syngas (13) is purified in a cryogenic section (CS) and a nitrogen-rich liquid stream (30) is separated from the raw syngas flow during purification and HN ratio adjustment, and wherein the pressure of said liquid stream (30) is reduced in a turbine (60) to enhance net refrigerative effect for the cryogenic section. Embodiments wherein chilling is also provided by a low-pressure or high-pressure syngas expander are also disclosed.