Patent ID: 6036868
Filing Date: 2000-03-14
Classification: B01D

Abstract:
A method of reducing turbidity and removing emulsified oil from industrial waste water streams which comprises the steps of:a) adding from about 0.5 ppm to about 500 ppm of a water-soluble hydrophilic dispersion polymer to the waste water stream, said water-soluble polymer formed under free-radical forming polymerization conditions in a medium containing water, monomers, stabilizer polymer and an aqueous anionic salt solution, wherein said water-soluble polymer is formed from polymerization of monomers selected from the group consisting ofi. acrylamide or methacrylamide; andii. a cationic monomer selected from the group consisting of:diallyl-N,N-dimethyl ammonium halides,and monomers of formula I ##STR6## wherein R.sub.1 is selected from the group consisting of hydrogen and methyl groups, R.sub.2 and R.sub.3 are selected from the group consisting of C.sub.1 alkyl and C.sub.2 alkyl groups; R.sub.4 is selected from the group consisting of hydrogen, C.sub.1 alkyl and C.sub.2 alkyl groups; A is selected from the group consisting of an oxygen atom and NH; B is selected from the group consisting of C.sub.2 alkyl, C.sub.3 alkyl and C.sub.4 alkyl groups and X.sup.- is an anionic counterion wherein the mole ratio of acrylamide or methacryamide to cationic monomer is from about 95:5 to about 50:50 to demulsify said oil, reduce said turbidity, and form an oil phase and a water phase;b) recovering said water phase.