Suppression of corrosion in caustic manufacturing systems

Details Suppression of corrosion in caustic manufacturing systems Suppression of corrosion in caustic manufacturing systems

1984-10-01

1986-04-29

Terapane, John F.

Compositions

Preservative agents

Anti-corrosion

422 13, 210757, 423183, 423641, 159DIG20, 159DIG34, C23F 1106

Patent

active

045855790

ABSTRACT:
The addition of a small amount of hydrogen or a hydrogen-liberating compound such as a metal hydride to a caustic solution serves to suppress the corrosive effect of the solution on nickel-based surfaces. Typical nickel-based surfaces include caustic evaporator surfaces which contain a caustic solution maintained at a temperature of from about 130.degree. C. to about 180.degree. C. A preferred metal hydride is sodium borohydride which is preferably present in an amount of from about 5 ppm to about 100 ppm. Concentrated caustic solutions containing less than 0.5 ppm of nickel can be prepared by this process.

REFERENCES:
patent: 2404453 (1946-07-01), Osborne et al.
patent: 2735750 (1956-02-01), Rahn
patent: 3600316 (1971-08-01), Mostecky et al.
patent: 4282178 (1981-08-01), Khare
patent: 4397720 (1983-08-01), Moore et al.
Hawley, G. G. (Ed.), The Condensed Chemical Dictionary, Ninth, Ed. 1977, Van Nostrand Reinhold Co., p. 448.

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