Process for removing residual hydrazine from caustic solutions

Details Process for removing residual hydrazine from caustic solutions Process for removing residual hydrazine from caustic solutions

1981-04-06

1982-12-28

Vertiz, O. R.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkali metal

423179, 423183, 423641, C01D 136

Patent

active

043661300

ABSTRACT:
In a process for manufacturing food-grade caustic such as sodium hydroxide wherein hydrazine or a derivative or salt thereof is used as a corrosion inhibitor, residual hydrazine is removed from the concentrated caustic product solution by oxidation. The oxidation of residual hydrazine is accomplished by adding to the hydrazine-containing concentrated caustic solution, which is characterized by a pH of 14 or higher, a 5- to 10-fold stoichiometric excess of hydrogen peroxide or an equivalent peroxy compound or hypochlorite.

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patent: 4282178 (1981-08-01), Khare
L. F. Audrieth and B. A. Ogg, "The Chemistry of Hydrazine", John Wiley & Sons, Inc., New York, N.Y., 1951, pp. 129-133.

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