Verfahren zur Herstellung von Harnstoff aus Ammoniak und Kohlendioxyd

摘要

In a process for producing urea from carbon dioxide and ammonia, unconverted ammonium carbamate (or carbon dioxide and ammonia) is separated from the product by successive evaporation at above 60 atm., at 13-25 atm., and at below 10 atm. pressure.