Suppression of corrosion in caustic manufacturing systems
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United States of America Patent
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Apr 29, 1986
Grant Date -
N/A
app pub date -
Oct 1, 1984
filing date -
Oct 1, 1984
priority date (Note) -
Expired
status (Latency Note)
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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.
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