Process for synthesizing urea

Details Process for synthesizing urea Process for synthesizing urea

1982-09-30

1985-03-12

Hines, Robert V.

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

Organic compounds

Amino nitrogen containing

564 70, 564 71, 564 72, C07C12602

Patent

active

045046794

ABSTRACT:
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 construction cost of a urea synthesis plant.

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patent: 4354040 (1982-10-01), Inoue et al.

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