PROCESS AND SYSTEM FOR CLEANING A GAS STREAM

摘要

The present application relates to a system and a process for gas cleaning wherein a) part of the carbon dioxide contained in the gas stream is removed by bringing the gas stream into contact with a first ammoniated liquid; b) a further part of the carbon dioxide contained in the gas stream is removed by bringing the gas stream partly depleted in carbon dioxide into contact with a second ammoniated liquid to form a carbon dioxide depleted gas stream enriched in ammonia; and c) at least a part of the ammonia of the gas stream is removed by bringing the carbon dioxide depleted gas stream enriched in ammonia into contact with the liquid enriched in carbon dioxide formed in step a) to absorb into the liquid ammonia from the gas stream, such that a carbon dioxide depleted gas stream at least partly depleted in ammonia and a liquid enriched in ammonia are formed, wherein the liquid enriched in ammonia is the first ammoniated liquid used in step a).