| 摘要 |
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 DEG C; at the bottom, it is 180-230 DEG 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. |
