Treatment of water vapor generated in concentrating an...

Details Treatment of water vapor generated in concentrating an... Treatment of water vapor generated in concentrating an...

C - Chemistry, Metallurgy

07

C

260/548.4

C07C 273/04 (2006.01)

Patent

CA 1044257

A B S T R A C T Water vapor generated in concentrating an aqueous urea solution and containing a small amount of aqueous urea solution mist, ammonia and carbon dioxide is treated to recover urea and ammonia values. The water vapor is introduced into a separator wherein all of the urea solution mist is separated together with a part of the ammonia and the carbon dioxide to form a first condensate. The water vapor is then fed into a surface cooler wherein the water vapor is indirectly cooled to form a second condensate. The first condensate is used for process water and the second condensate is subjected into rectification to separate ammonia and carbon dioxide contained therein in the form of a mixed gas, which is recovered, from the remaining waste water free of ammonia and carbon dioxide.

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