Compositions for reducing true color in waste liquids
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United States of America Patent
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Jan 28, 2003
Grant Date -
Sep 19, 2002
app pub date -
Mar 11, 2002
filing date -
Feb 12, 1999
priority date (Note) -
Expired
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Abstract
Compositions of aluminum chlorohydrate and high molecular weight branched epichlorohydrin amine condensate polymers are applied to waste liquids, such as pulp and paper mill effluents having a lignin content, to reduce true color, The branched epichlorohydrin amine condensate polymer is branched using branching agents which result in a molecular weight greater than about 300,000 and permit solubility. When applied to waste liquids, the high molecular weight branched epichlorohydrin amine condensate polymer and aluminum chlorohydrate react with the lignin components in the waste liquid to form an insoluble agglomerate thus reducing the true color of the waste liquid. The resulting agglomerate, including the colored lignin, may be filtered from the waste liquid.
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