Process for the Production of Ammonia Synthesis Gas With Improved Cryogenic Purification
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United States of America Patent
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Feb 22, 2012
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Aug 28, 2008
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Abstract
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.
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