1972 Tennyson Fluor 3620031 ammonia recovery

This invention describes a process for the recovery of ammonia from mixed ammonia and inert gaseous effluents from urea synthesis plants, by passage of such effluent through a first cooling zone to partially condense the ammonia, and then through a second cooling zone where most advantageously, the effluent from the first cooling zone is direcly contacted with liquid ammonia to further deplete the inert gas of its ammonia content, liquid ammonia from both cooling zone s being recovered and utilized as ammonia feed to the synthesis plant.


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