Patent ID: 6258279
Filing Date: 2001-07-10
Classification: C02F,Y10S

Abstract:
A method of removing color bodies including lignins, lignin degradation products, or humic acids from paper mill waste water comprising adding to the water an effective color-removing amount of a hydrophilic cationic dispersion polymer prepared by polymerizingi. a cationic diallyl-N,N-disubstituted ammonium halide of formula(H.sub.2 C.dbd.CHCH.sub.2).sub.2 N.sup.+ R.sub.1 R.sub.2 X.sup.-wherein R.sub.1 and R.sub.2 are independently C.sub.1 -C.sub.20 alkyl, aryl or arylalkyl and X is an anionic counterion andii. an acrylamide monomer of formula ##STR4##whereinR.sub.3 and R.sub.4 are independently hydrogen, C.sub.1 -C.sub.10 alkyl, aryl or arylalkyl;R.sub.5 is hydrogen or methyl andR.sub.6 and R.sub.7 are independently hydrogen or C.sub.1 -C.sub.10 alkyl,in an aqueous solution of a polyvalent anionic salt wherein the polymerization is carried out in the presence of a dispersant, and removing said color bodies from said waste water.