Integrated ammonia-urea process

Details Integrated ammonia-urea process Integrated ammonia-urea process

C - Chemistry, Metallurgy

07

C

260/548.4

C07C 273/04 (2006.01)

Patent

CA 1110659

ABSTRACT OF THE DISCLOSURE . An integrated ammonia-urea process is disclosed which uses as the starting gas mixture a stream coming, for example, from steam reforming of hydrocarbons, carbon dioxide being stripped from said stream by the action of a very concentrated ammonia solution (above 70% by wt) first and of an ammoniated solution of ammo- nium carbonate secondly, a solution of ammonium carbamate being obtained together with a gas stream composed by nitrogen and hydrogen, sending the carbamate solution to the urea reactor, discharging from the urea reactor the urea solution containing unconverted carbamate and excess ammonia, decomposing said carbamate and sending evolved ammonia to the urea reactor again along with carbon dioxide, discharging the urea solution having now 50% of the original carbamate to an adiabatic stripper in which the stripping gas is essentially composed by hydrogen and nitrogen, removing ammonia and carbon dioxide with water from the adiabatic stripper and condensing am- monia and carbon dioxide by heat exchange, sending the stream of hydrogen and nitrogen to methanization and ammo- nia synthesis and concentrating the urea solution direct- ly until obtaining a urea melt.

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