Method for cleaning a vessel

Details Method for cleaning a vessel Method for cleaning a vessel

1991-03-14

1992-11-17

Pal, Asok

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

134 3, 134 28, 134 41, B08B 300

Patent

active

051640155

ABSTRACT:
A method for cleaning a vessel by dissolving iron oxide present in the vessel includes introducing a saline solution into the vessel, the saline solution being formed of an acid acting as a complexing agent, of an alkalizing agent and of a reducing agent, the saline solution acting as an alkaline reducer; retaining the saline solution in the vessel for a given period of time at a temperature above 140.degree. C. and below the decomposition temperature of the anionic part of the saline solution for forming an iron complex; and subsequently removing the dissolved iron complex by emptying the vessel.

REFERENCES:
patent: 3627687 (1971-12-01), Teumac
patent: 3627857 (1971-12-01), Matuno
Publication "Steam Generator Chemical Cleaning Process Development", Final Report, Apr. 1983, pp. 4-1-4-3.

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