Process and apparatus for the removal of ammonium carbamate...

Details Process and apparatus for the removal of ammonium carbamate... Process and apparatus for the removal of ammonium carbamate...

C - Chemistry, Metallurgy

07

C

23/391, 260/557.

C07C 273/04 (2006.01)

Patent

CA 1113961

ABSTRACT OF THE DISCLOSURE An improved process and apparatus for the removal of ammonium carbamate from an aqueous urea solution wherein the aqueous urea solution is introduced into a stripping zone and caused to flow down a heat exchange wall as a thin film while being heated and contacted in counter-current relation with a gaseous stripping agent. The aqueous urea solution, while being stripped, is heated for at most 5 seconds at a temperature in the range of from 180-195°C. and there- after cooled to a temperature of from 155-170°C.

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