Process for purifying urea-containing waste water and...

Details Process for purifying urea-containing waste water and... Process for purifying urea-containing waste water and...

C - Chemistry, Metallurgy

02

F

362/66, 260/249.

C02F 1/02 (2006.01) C01C 1/08 (2006.01) C01C 1/12 (2006.01) C07D 251/60 (2006.01)

Patent

CA 1141872

Abstract of the Disclosure An improved process for the removal of urea from urea-containing waste water by hydrolysis and desorption of the ammonia and carbon dioxide thus formed. Urea-containing waste water is treated in a process for the separation of ammonia and carbon dioxide from mixtures thereof, which process has (a) an ammonia separation zone wherefrom ammonia, substantially free of carbon dioxide and water, is obtained, (b) a carbon dioxide separation zone where- from carbon dioxide, substantially free of ammonia and water is obtained, and (c) a desorption zone wherefrom water, substantially free of carbon dioxide and ammonia is obtained. The urea is substantially completely hydrolyzed and the ammonia and carbon dioxide produced thereby can be recovered.

351675

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