Synthesis of urea

Details Synthesis of urea Synthesis of urea

1981-08-18

1982-12-21

Doll, John

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

C07C12602

Patent

active

043650899

ABSTRACT:
The specification describes a process for synthesizing 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/cm.sup.2 G, 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.degree.-210.degree. 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.

REFERENCES:
patent: 2056283 (1936-10-01), Lawrence et al.
patent: 3005849 (1961-10-01), Otsuka
patent: 3146263 (1964-08-01), Otsuka
patent: 3356723 (1967-12-01), Kaasenbrood
patent: 4301299 (1981-11-01), Inoue et al.

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