Methods of preparing novel halide anion free quaternary ammonium salt monomers, polymerization methods therefor, and methods of use of the resulting polymers
View Patent ↗Methods are provided for making halide-free quaternary ammonium salt monomers. Polymers prepared from the monomers and methods of using the polymers to clarify raw, untreated water or wastewater are also disclosed.
1. A method for clarifying water comprising adding to said water a coagulant, said coagulant being polydiallyldimethylammonium acetate (PDADMOAC) prepared using a diallyldimethylammonium acetate (DADMOAC) monomer formed by:
reacting diallyldimethylammonium chloride and an anion contributing metathesis agent in an aqueous solution to yield a precipitate and a diallyldimethylammonium anion, and removing said precipitate from said solution;
wherein said anion contributing metathesis agent is potassium acetate and said precipitate is KCl.
2. A method as recited in claim 1 wherein said water is raw, untreated water from a lake, river, pond, stream or aquifer.
3. A method as recited in claim 1 wherein said water is wastewater.
4. A method as recited in claim 1 wherein about 0.5-75 ppm of said PDADMOAC is added to said wastewater.
5. A method as recited in claim 4 wherein about 1 to about 50 ppm of said PDADMOAC is added to said wastewater.
6. A method as recited in claim 3 wherein said wastewater is oily wastewater from food and beverage, steel, automotive, transportation, refinery, pharmaceutical, metals, paper and pulp, chemical processing, and hydrocarbon processing industries.
7. A method as recited in claim 6 wherein said PDADMOAC has a molecular weight of between about 5,000 to 2,000,000.
8. The method of claim 1 , wherein said coagulant is added to said water in the amount of about 0.25-500 ppm based upon one million parts of said water.