Dispersion polymers for ethylene quench water clarification

DETAILED DESCRIPTION We claim: 1.
A method of removing emulsified oil from ethylene quench water, the method comprising the step of treating the oil-containing water with an effective amount of a dispersion of a water-soluble cationic polymer, said dispersion of the water-soluble cationic polymer being prepared by polymerizing a water-soluble monomer mixture containing a least 5 mole % of a cationic monomer represented by general formula (I) and at least 5 mole % of acrylamide or methacrylamide in an aqueous solution of a polyvalent anionic salt, said polymerization is carried out in an aqueous solution including from about 1 to about 10 percent by weight based on the total weight of the monomers a dispersant polymer, said dispersant polymer being a water-soluble cationic polymer which is soluble in said aqueous solution of the polyvalent anionic salt and which contains at least 20 mole % of cationic monomer units represented by a general formula (II): ##STR4## wherein R.
sub.
1 and R.
sub.
4 are each H or CH.
sub.
3 ; R.
sub.
2, R.
sub.
3, R.
sub.
5 and R.
sub.
6 are each an alkyl group having 1 to 2 carbon atoms; R.
sub.
7 is a hydrogen atom or an alkyl group having 1 to 2 carbon atoms; A.
sub.
1 and A.
sub.
2 are each an oxygen atom or NH; B.
sub.
1 and B.
sub.
2 are each 2 to 4 carbon atoms or a hydroxypropyl group and X.
sub.
1 - and X.
sub.
2 - are each a counter anion, once treated, the emulsified oil flocculates; and removing the flocculated emulsified oil from the treated ethylene quench water.
2.
The method of claim 1 wherein said aqueous solution further includes a seed polymer; said seed polymer being a water-soluble cationic polymer which is insoluble in said aqueous solution of the polyvalent anionic salt and which contains at least 5 mole % of cationic monomer units represented by the general formula (I).
3.
The method of claim 1 wherein the water-soluble monomer mixture further contains at least 5 mole % of a cationic monomer represented by the general formula (II).
4.
The method of claim 1 wherein the polyvalent anionic salt comprises a phosphate, a sulfate or a mixture thereof