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US 5,635,112 AGranted
Hydrophobically-modified demulsifiers for oil-in-water systems
AssigneeNalco Chemical Company
InventorsManian Ramesh, Ananthasubramanian Sivakumar
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Abstract
A method for breaking an oil-in-water emulsion which comprises the addition of a hydrophobically-modified polyelectrolyte copolymer comprising a diallyldimethylammonium chloride and a hydrophobically-associating monomer selected from the group consisting of quaternized dialkylaminoalkylacrylates, quaternized dialkylaminoalkylmethacrylates, and alkyl esters of (meth)acrylic acids, preferably ethylhexylacrylate, to the emulsion.
Claims3
A method for breaking an oil-in-water emulsion which comprises:
- A. adding an effective emulsion-breaking amount of a hydrophobically-modified polyelectrolyte copolymer selected from the group consisting of poly(diallyldimethylammonium chloride/dimethylaminoethylacrylate benzyl chloride quaternary), poly(diallyldimethylammonium chloride/dimethylaminoethylacrylate cetyl chloride quaternary), poly(diallyldimethylammonium chloride/dimethylaminoethylmethacrylate benzyl chloride quaternary) and poly(diallyldimethylammonium chloride/dimethylaminoethylmethacrylate cetyl chloride quaternary to the oil-in-water emulsion;
- B. allowing said emulsion to separate into an oil phase and a water phase;
- and,
- C. recovering said separated phases.
1 more element
Dependencies are inferred from the claim text.