| 摘要 |
A process for synthetizing urea by starting from NH3 and CO2, with total CO2 conversion is disclosed which comprises: (a) feeding, in countercurrent mode, to a reactive distillation column, NH3 to the column bottom and CO2 to the central column zone, with a liquid bottom stream being obtained which contains urea, NH3 and water, and an overhead gas and/or supercritical stream constituted by NH3 and water being obtained; (b) feeding the liquid stream coming from the bottom of the reactive distillation column to one or more separation steps, with NH3 containing streams and an urea containing stream to be sent to a subsequent prilling step being obtained; (c) feeding the gas and/or supercritical stream coming from the reactive distillation column head, to a distillation column from the bottom of which water and from the head of which NH3 are separated. |
