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Chapter 22.4.19 Liquid nitrogen wash for final purification of the synthesis gasDescriptionThe synthesis gas is scrubbed countercurrently with liquid nitrogen at a temperature of around-185 °C. The CO 2 , CO and CH 4 impurities are dissolved in the liquid nitrogen and recovered byflashing and distilling, for subsequent use as a fuel. In the liquid nitrogen wash, the nitrogen forthe ammonia synthesis reaction is also supplied. The process produces practically inert freesynthesis gas. As the synthesis gas is of such a high purity, the purge gas is unnecessary and ahigh conversion rate per pass is achievable.Achieved environmental benefits• eliminates purge gas• increases the efficiency of the synthesis loop.Cross-media effectsNot believed likely.Operational dataNo information provided.ApplicabilityThis is an integrated technique applicable to new partial oxidation plants.EconomicsNo information provided, but cost benefits can be assumed.Driving force for implementationCost benefits.References to literature and example plants[3, European Commission, 1997]Large Volume Inorganic Chemicals – Ammonia, Acids and Fertilisers 83