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1987 Douwes Stamicarbon 4652678 Emissions

This patent describes a process whereby the dilute aqueous stream resulting from the evaporation section is first send to a first desorber to reduce the ammonia and carbon dioxide content. Then this stream is used in a dust scrubber of a granulation section or prill tower where it will reduce the dust emission. Thereafter the solution is send to a hydrolyser and a second desorber to recover the urea in the form  of ammonia and carbon dioxide which can be recycles to the synthesis.

 

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