PROCESS FOR PRODUCING AN AQUEOUS SOLUTION CONTAINING A SOURCE OF CHROMIUM (III)
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United States of America Patent
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Issued Date -
Jul 14, 2011
app pub date -
Aug 24, 2009
filing date -
Sep 5, 2008
priority date (Note) -
Abandoned
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Abstract
In a method for manufacturing an aqueous solution containing a source of chromium (III) according to the present invention, an aqueous solution containing trivalent chromium is added to an aqueous solution of an inorganic alkali under the condition of a reaction liquid temperature of 0° C. or more and less than 50° C., so that the amount of the trivalent chromium is not locally excessive with respect to the amount of the alkali, to produce chromium hydroxide, and then the chromium hydroxide is dissolved in an aqueous solution of an acid to obtain an aqueous solution containing a source of chromium (III). Preferably, after production of the chromium hydroxide, filtration is performed, and the chromium hydroxide is washed with water until the conductivity of the filtrate is 5 mS/cm or less.
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