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US 5,961,838 AGranted
Amphoteric polymer/polyamine combinations for color removal and clarification of paper mill waste water
AssigneeNalco Chemical Company
InventorsMichael L. Braden, Richard E. Metzgar, Jitendra T. Shah
Life of this patent
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Abstract
Processes for removing color from a paper mill waste effluent and for removing color from a textile plant waste effluent utilizing an amphoteric copolymer/polyamine combination are described. A preferred amphoteric copolymer is poly(dimethylaminoethylacrylate methyl chloride quaternary salt/acrylic acid) and a preferred polyamine is a polymeric reaction product of epichlorohydrin and dimethylamine.
Claims4
A process for removing color from a paper mill waste effluent or a textile plant waste effluent containing color bodies which comprises:
- a) treating the waste effluent containing color bodies with an effective color-removing amount of a 1:1 mixture of
- i) a poly(dimethylaminoethylacrylate methyl chloride guatenary/acrylic acid) polymer with a mole ratio of dimethylaminoethylacrylate methyl chloride quaternary to acrylic acid of about 70 to about 30;
- and
- ii) an epichlorhydrin/dimethylamine condensation polymer;
- b) coagulating the color bodies present in the waste effluent;
- and then
- c) removing the coagulated color bodies from the waste effluent.
4 more elements
Dependencies are inferred from the claim text.