Process for the preparation of urea

Details Process for the preparation of urea Process for the preparation of urea

C - Chemistry, Metallurgy

07

C

C07C 273/04 (2006.01) C07C 273/14 (2006.01) C07C 273/16 (2006.01) C07D 487/18 (2006.01)

Patent

CA 2158826

Process for the preparation of urea, wherein in a first step ammonia and carbondioxide react in suitable conditions so as to form a first mixture containing a quantity of urea, wherein in one or more subsequent steps ammonia and carbondioxide is removed from the first mixture and the obtained urea is concentrated until a urea concentration has been reached suitable to be granulated in a gas stream, whereby apart from urea granules a second mixture containing air, gaseous ammonia and urea dust is formed which subsequently is washed, and wherein before or during the washing an amount of formaldehyde is added to the second mixture of air, ammonia and urea under circumstances wherein the ammonia can react with the formaldehyde in order to form hexamethylenetetramine (HMTA) whereupon the so formed HMTA is separated from the gasstream and is returned into the process before the granulation step.

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