High performance polymer flocculating agents
AssigneeCytec Technology Corp.
InventorRaymond Farinato
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Abstract
Water-soluble, branched, high molecular weight, cationic polymer flocculants are disclosed, as well as methods of making the same and methods of dewatering suspended solids using the same.
Claims16
A method of dewatering a dispersion of suspended solids, comprising (a) adding to the dispersion an effective amount of a cationic, water-soluble or water-swellable polymer to form a mixture of the dispersion and said polymer, wherein said polymer has a bulk viscosity to standard viscosity ratio of about 300 to about 500, wherein said polymer has a sedimentation value of about 10% or less, and wherein said polymer contains recurring (meth)acrylamide units and recurring diallyldimethylammonium chloride, dialkylaminoalkyl(alk)acrylate, or dialkylaminoalkyl(alk)acrylamide units and (b) dewatering said mixture.
A method of dewatering sewage sludge, comprising (a) adding to the sludge an effective amount of a water-soluble copolymer of acrylamide and quaternized dialkylaminoalkyl(alk)acrylate to form a mixture of the sludge and said copolymer, wherein said copolymer has at least about 20 mole percent cationic units based on the total number of moles of recurring units in said polymer, a bulk viscosity to standard viscosity ratio of from about 300 to about 400, and a sedimentation value of about 5% or less, and (b) dewatering said mixture.
A method of dewatering sewage sludge, comprising (a) adding to the sludge an effective amount of a water-soluble copolymer of acrylamide and acryloxyethyltrimethylammonium chloride to form a mixture of the sludge and said copolymer, wherein said copolymer has at least about 30 mole percent cationic units based on the total number of moles of recurring units in said polymer, a bulk viscosity to standard viscosity ratio of from about 330 to about 390, and a sedimentation value of about 3% or less, and (b) dewatering said mixture.
Dependencies are inferred from the claim text.