Method of recovering unreacted materials and heat in urea...

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

C - Chemistry, Metallurgy

07

C

260/548.4

C07C 273/04 (2006.01)

Patent

CA 1060472

Abstract of the Disclosure 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 step- wise 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 decom- position stage is concentrated, with water vapor generated upon said concent- ration being condensed. The condensate contains small amounts of ammonia and carbon dioxide which 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.

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