Method for the condensation of carbamate in urea-synthesis...

Details Method for the condensation of carbamate in urea-synthesis... Method for the condensation of carbamate in urea-synthesis...

C - Chemistry, Metallurgy

07

C

260/548.1

C07C 273/04 (2006.01)

Patent

CA 1069932

ABSTRACT OF THE DISCLOSURE: The invention is concerned with an improved process for synthesizing urea which includes producing vapors of NH2+ CO2+ H2O through a high pressure distillation stage and feeding a mixture of the vapors and a carbonate solution which is rich in H2O to a carbonate condenser provided with a jacket through which water is circulated for the recovery of the heat of con- densation by the production of steam and having a condensation zone where the vapors are condensed to produce a carbamate solu- tion for recycle to a urea reactor. The improvement comprises forming the condensation zone of a horizontal-tube-bundle and maintaining the condensation zone under a static head (.DELTA.P) in the range between 0.5 and 5 atmospheres. The process of the inven- tion permits a reliability of operation under optimum conditions without crystallization or preferential paths.

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