Synthesis of urea

Details Synthesis of urea Synthesis of urea

C - Chemistry, Metallurgy

07

C

260/548.4

C07C 273/04 (2006.01)

Patent

CA 1216861

- 1 - SPECIFICATION Title of the Invention SYNTHESIS OF UREA Abstract of the Disclosure The specification describes a process for synthe- sizing urea. The process comprises reacting ammonia and carbon dioxide in a molar ratio of 3:1 - 5:1 and at a pressure of 150 - 250 Kg/cm2G, subjecting the resultant reaction mixture to a stripping step using gaseous carbon dioxide at a pressure substantially equal to the urea synthesis pressure and a temperature of 195 - 210°C to remove unreacted ammonia and unreacted carbon dioxide contained in the reaction mixture so that the content of unreacted ammonia is lowered to 10 - 15% by weight. This invention ensures a high conversion ratio from carbon dioxide to urea, considerably little formation of biuret during the stripping step, and reduced consumption of high pressure steam.

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