Method of recovering unreacted materials and heat in urea synthe

Details Method of recovering unreacted materials and heat in urea synthe Method of recovering unreacted materials and heat in urea synthe

1976-12-02

1977-10-11

Meros, Edward J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C12602

Patent

active

040535070

ABSTRACT:
Urea synthesis effluent obtained by reacting carbon dioxide with ammonia is subjected to a plurality of decomposition stages, e.g., three stages, to decompose and recover the unreacted ammonium carbamate with stepwise reduction of pressure, and the off-gas is absorbed in an absorbent in each stage and is recovered. The aqueous urea solution from the final decomposition stage is concentrated, water vapor generated upon said concentration is condensed, and the condensate containing small amounts of ammonia and carbon dioxide is stripped with steam recovered from the high pressure absorption zone. The steam discharged from the stripping step is introduced into the final decomposition stage to directly heat the urea synthesis effluent.

REFERENCES:
patent: 3232983 (1966-01-01), Flinn
patent: 3506710 (1970-04-01), Inoue et al.
patent: 3573173 (1971-03-01), Otsuka et al.
patent: 3636106 (1972-01-01), Villiers-Fisher et al.
patent: 3725210 (1973-04-01), Otsuka et al.
patent: 3944605 (1976-03-01), Inoue et al.
patent: 4003801 (1977-01-01), Chikaoka et al.

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