| 摘要 |
<p>A process for the integrated production of urea and melamine synthesized from at least part of said urea, comprising the steps of:
- carrying out a urea synthesis in a first urea synthesis reactor (16), fed with ammonia and carbon dioxide, obtaining a reaction mixture comprising urea and ammonium carbamate,
- carrying out melamine synthesis, with formation of off-gas comprising ammonia and carbon dioxide,
- carrying out a further urea synthesis in a second urea synthesis reactor (28), fed with said off-gas, with production of a respective reaction mixture comprising urea and ammonium carbamate,
- feeding said reaction mixture produced by said first reactor (16) and said reaction mixture produced by said second reactor (28) to a urea recovery unit (18), obtaining urea and an ammonium carbamate aqueous solution,
- feeding said ammonium carbamate aqueous solution obtained in said recovery unit (18) to said second urea synthesis reactor (28).</p> |
