Method of decolorizing wet process phosphoric acid
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United States of America Patent
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Feb 17, 1987
Grant Date -
N/A
app pub date -
Jan 22, 1986
filing date -
Jan 22, 1986
priority date (Note) -
Expired
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Abstract
A method of decolorizing wet process phosphoric acid containing organic color-imparting impurities is provided. The process includes treating the acid with a strong oxidant at a temperature in the range of about 50.degree. to about 150.degree. C. by slowly adding the oxidant to the acid over a period of time of at least about 3 hours. The oxidized acid then is contacted with a regenerable activated carbon, preferably in a packed column, in order to adsorb the oxidized color-imparting impurities.
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