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Improved process for Ammonia Recovery separately substantially free of carbon dioxide and Water, Carbon Dioxide, substantially free of ammonia and Water
Improved process for Ammonia Recovery separately substantially free of carbon dioxide and Water, Carbon Dioxide, substantially free of ammonia and Water
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机译:改进的氨回收工艺,分别基本不含二氧化碳和水,二氧化碳,基本不含氨和水
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摘要
An improved process for the separate recovery of substantially pure ammonia and substantially pure carbon dioxide from mixtures containing ammonia and carbon dioxide, and possibly water, such as are obtained as by-products in the manufacture of melamine from urea or the synthesis of urea from ammonia and carbon dioxide. The by-product mixture is introduced into a process loop having an ammonia separation zone, a carbon dioxide separation zone and a desorption zone, the zone to which the mixture is initially fed being dependent upon its composition. The separation is effected by maintaining a system pressure differential between the ammonia and carbon dioxide separation zones, or adding diluting water to the carbon dioxide separation zone. The efficiency of the separation is enhanced by introducing an ammonia containing gaseous phase into the bottom of the carbon dioxide separation zone.
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