Method for avoiding the corrosion of the strippers in the urea m

Details Method for avoiding the corrosion of the strippers in the urea m Method for avoiding the corrosion of the strippers in the urea m

1987-05-11

1988-07-19

Bashore, S. Leon

Distillation: processes, separatory

Addition of material to distilland to inhibit or prevent...

For scale inhibiting or corrosion preventing

203 73, 203 86, 203 89, 203DIG9, 159 472, 159 49, 564 68, 564 73, B01D 334

Patent

active

047583118

ABSTRACT:
A method for passivating the surface of the strippers of the urea plants, where the temperatures are very high, where the pressures range from 120 to 240 Kg/cm.sup.2 and where the effluent process flow from the synthesis reactor undergoes one or more falling-film evaporations, preferably in countercurrent with a driving gas consisting of NH.sub.3 or CO.sub.2, 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 solution, before or contemporaneously to the start of the evaporation.

REFERENCES:
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General Organic, Belgian Report, Dec. 1963, p. 3.
European Chemical News; Jan. 17, 1969 ("urea supplement"); pp. 17-20.

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