C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
148/25
C23C 8/18 (2006.01) C07C 273/04 (2006.01)
Patent
CA 1211689
ABSTRACT OF THE DISCLOSURE- A method for passivating the surface of the strippers of the urea manufacturing plants, where the tem- peratures are very high, where the pressures range from 120 to 240 Kg/cm2 and where the effluent process flow from the synthesis reactor undergoes one or more falling-film evapo- rations, preferably in countercurrent with a driving gas consisting of NH3 or CO2, characterized by the fact that the passivation is carried out by means of a sinergistic combination of oxygen, preferably injected into the bottom of at least one stripper, and of a second passivating agent, preferably injected into the process flow entering the head of at least one stripper, wherein said second passivating agent is injected in the liquid state or as a liquid solu- tion, before or contemporaneously to the start of the evaporation.
422202
Faita Giuseppe
Grassini Ubaldo
Pagani Giorgio
Montedison S.p.a.
Robic Robic & Associes/associates
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