Method of stripping unreacted materials in urea synthesis proces

Details Method of stripping unreacted materials in urea synthesis proces Method of stripping unreacted materials in urea synthesis proces

1981-03-03

1982-03-23

Doll, John

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

Organic compounds

Amino nitrogen containing

564 70, C07C12602

Patent

active

043214100

ABSTRACT:
In a process in which a urea synthesis effluent obtained by reacting ammonia with carbon dioxide is subjected to a stripping step of bringing the urea synthesis effluent into countercurrent contact with carbon dioxide under heating to obtain an aqueous urea solution containing a small amount of ammonia and ammonium carbamate, the improvement comprises first bringing the urea synthesis effluent is into contact with a separated gas evolved in the stripping step under adiabatic conditions or with a little cooling. The use of the above process enables a reduction in size of the stripper and a recovery of the high pressure steam without keeping the ammonia to carbon dioxide molar ratio lower than that of the conventional method.

REFERENCES:
patent: 3347915 (1967-10-01), Fauser
patent: 3725210 (1973-04-01), Otsuka et al.
patent: 3952055 (1976-04-01), Mavrovic
patent: 4086271 (1978-04-01), Mavrovic
patent: 4088685 (1978-05-01), Mavrovic
patent: 4256662 (1981-03-01), Gorlovsky et al.

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