Reducing turbidity in chromic acid solutions

Details Reducing turbidity in chromic acid solutions Reducing turbidity in chromic acid solutions

1990-10-29

1991-07-23

Lewis, Michael L.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

210758, 210766, 423 53, C01G 37033

Patent

active

050342118

ABSTRACT:
Disclosed is a method of reducing the turbidity of an aqueous solution of chromic acid which is formed by dissolving melted chromic anhydride in water. The chromic anhydride is contacted with water in an amount in excess of 0.02 wt %, but insufficient to form a solution, at a temperature above ambient but below about 196.degree. C. The water may be in the form of a liquid, water vapor, or steam. When the chromic anhydride is subsequently dissolved in water, the solution is much less turbid than it otherwise would be.

REFERENCES:
patent: 2034256 (1936-03-01), Vetter
patent: 2993756 (1961-07-01), Marlatt et al.
patent: 4431625 (1984-02-01), Marshall et al.
Kirk-Othmer, "Encyclopedia of Chemical Technology", Wiley and Sons, N.Y., 3rd ed., vol. 6 p. 95.
J. P. Mellor, A Comprehensive Treatise on Inorganic and Theoretical Chemistry.

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