C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/548.1
C07C 273/04 (2006.01)
Patent
CA 1217201
- 1 - SPECIFICATION Title of the Invention PROCESS FOR SYNTHESIZING UREA Abstract of the Disclosure Disclosed herein is a process of synthesizing urea including reacting ammonia and carbon dioxide at a urea synthesis pressure and temperature in a urea synthesis zone, separating excess ammonia and unreacted ammonium carbamate from the thus obtained urea synthesis melt as a gaseous mixture containing ammonia and carbon dioxide, recirculating the gaseous mixture to the urea synthesis zone, and, on the other hand, obtaining urea from an aqueous urea solution which has been obtained by separating the excess ammonia and unreacted ammonium carbamate. The above process features ingeniously combined conditions of various process steps. It produces urea using less high-pressure steam and recovers less low-pressure steam. A stripping operation making use of carbon dioxide can be effectively incorporated in the above process. The above process permits to cut the construc- tion cost of a urea synthesis plant.
413526
Fujii Hidetsugu
Fukui Akito
Inoue Shigeru
Morikawa Haruyuki
Ono Hiroshi
Sim & Mcburney
Toyo Engineering Corporation
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