Method of treating residual acid
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United States of America Patent
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Feb 8, 2005
Grant Date -
Jul 1, 2004
app pub date -
Apr 4, 2003
filing date -
Apr 4, 2002
priority date (Note) -
Expired
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Abstract
A method of treating residual acid from production of chlorine dioxide is described. The method is characterized in that a compound containing iron is added to the residual acid to react therewith and form a product, which contains iron in trivalent form. As iron compound preferably ferrous sulphate is added, which under oxidation reacts with the residual acid to form ferric salt. Preferably sodium chlorate, sodium hypochlorite, hydrogen peroxide or an oxygen-containing gas is added as oxidant.
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