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US 7,084,205 B2Granted
Polymeric compositions for dewatering sewage sludges
AssigneeCiba Specialty Chemicals Water Treatments Ltd.
InventorsPeter Ian Norman, Helen Elizabeth Read, Nils Berggren
Life of this patent
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Abstract
Compositions comprising of blends of polymeric materials, including a cationic polymer having an intrinsic viscosity of from 8 to 17 dl/g and a cationic content of from 20 to 100% which may be used in the dewatering of thermophilic sludges.
Claims8
A composition comprising:
- a) a cationic polymer having intrinsic viscosity of from 0.01 to 5 dl/g and a cationic content of from 70 to 100% and,
- b) a cationic polymer having an intrinsic viscosity of from 8 to 17 dl/g and a cationic content of from 20 to 100%,
- wherein the composition is a non-aqueous liquid and components a) and b) are dispersed in the non-aqueous liquid, the ratio of component a) to component b) is from 90:10 to 10:90, and the intrinsic viscosity of the combined polymer components is from 4 to 15 dl/g.
A method of preparing a composition in a non-aqueous liquid comprising:
- a) a cationic polymer having intrinsic viscosity of from 0.01 to 5 dug and a cationic content of from 70 to 100%,
- b) a cationic polymer having an intrinsic viscosity of from 8 to 17 dug and a cationic content of from 20 to 100%,
- wherein the components a) and b) are dispersed in the non-aqueous liquid, the ratio of component a) to component b) is from 90:10 to 10:90, and the intrinsic viscosity of the of the combined polymer components is from 4 to 15 dl/g, comprising of mixing components a) and b).
Dependencies are inferred from the claim text.