Process for the removal of urea, ammonia and carbon dioxide...

Details Process for the removal of urea, ammonia and carbon dioxide... Process for the removal of urea, ammonia and carbon dioxide...

C - Chemistry, Metallurgy

07

C

362/66, 260/548.

C07C 273/04 (2006.01) C02F 1/02 (2006.01) C02F 1/04 (2006.01) C02F 1/58 (2006.01) C02F 9/00 (2006.01)

Patent

CA 1201726

A B S T R A C T Removal of urea, ammonia and carbon dioxide from diluted aqueous solutions, for instance urea process effluent, the solution being led into the top of a reaction column under a pressure of 10-30 bar, in which it flows down in counter-current to a flow of gas, for instance steam. The temperature in the top of the reaction column is 170-220 °C; at the bottom, it is 180-230 °C. Next, at a pressure of 1-5 bar, ammonia and carbon dioxide are removed from the urea-free bottom solution. The remaining solution contains less than 10 ppm urea and less than 10 ppm ammonia.

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