C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/557.6
C07C 273/04 (2006.01)
Patent
CA 1150312
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, such a process that the urea synthesis effluent is first brought into contact with a separated gas evolved in the stripping step under adiabatic condition or a little cooling is disclosed. 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.
372862
Fujii Hidetsugu
Fukui Akito
Morikawa Haruyuki
Ono Hiroshi
Mitsui Toatsu Chemicals Inc.
Sim & Mcburney
Toyo Engineering Corporation
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