EP0255283A1
Expired / Lapsed
EP
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Products and processes for the flocculation of aqueous suspensions
Assignee: Ciba Specialty Chemicals Water Treatments Ltd
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Filing: 1987-07-22
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Granted: —
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Expires: 2007-07-22
Abstract
Abstract An aqueous organic or inorganic suspension can be coagulated and then flocculated by flowing it past a shaped body comprising a mixture of water soluble multivalent metal coagulant and a water soluble organic polymeric flocculant in the form of substantially discrete particles. The surface of the shaped body is eroded by the flowing stream to form a solution of the coagulant in which the polymeric flocculant particles are entrained, and these subsequently dissolve into the suspension.
Inventors
- 👤 John Rodney Field
- 👤 Nicholas Denzil Smith
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 12:47
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5236; C02F1/5227; C02F1/54
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
64 words
A shaped body which comprises a mixture of water soluble multivalent metal coagulant and water soluble organic polymeric flocculant and in which the polymeric flocculant is in the form of substantially discrete particles and the surface of the body is erodable by immersion in a flowing stream of water to form a solution of the coagulant in which the polymeric flocculant particles are entrained.
Claim 2
Dependent Claim
64 words
A shaped body which comprises a mixture of water soluble multivalent metal coagulant and water soluble organic polymeric flocculant and in which the polymeric flocculant is in the form of substantially discrete particles and the surface of the body is erodable by immersion in a flowing stream of water to form a solution of the coagulant in which the polymeric flocculant particles are entrained.
Claim 3
Dependent Claim
25 words
A body according to claim 1 in which the mixture is a mixture of the flocculant particles and the coagulant in the form of particles.
Claim 4
Dependent Claim
27 words
A shaped body according to claim 1 in which the mixture is a shape-retaining, mixture of the flocculant particles and the coagulant in the form of particles.
Claim 5
Dependent Claim
38 words
A shaped body according to claim 1 in which the mixture is a substantially dry compress of the coagulant in the form of particles and the particles of the flocculant and which is substantially free of polymeric binder.
Claim 6
Dependent Claim
28 words
A shaped body according to claim 3 or claim 4 in which the ratio by volume of coagulant particles:flocculant particles is at least 80:20, preferably at least 87:13.
Claim 7
Dependent Claim
24 words
A shaped body according to claim 3 or claim 4 in which the ratio by weight of coagulant particles:flocculant particles is at least 90:10.
Claim 8
Dependent Claim
16 words
A shaped body according to any preceding claim in which the coagulant is aluminium sulphate hydrate.
Claim 9
Dependent Claim
31 words
A shaped body according to claim 1 in which the polymeric flocculant is a non-ionic or cationic polymer of one or more monoethylenically unsaturated monomers and has molecular weight above 500,000.
Claim 10
Independent Claim
86 words
A method of treating an aqueous suspension with a multivalent metal coagulant and then with an organic polymeric flocculant comprising flowing the suspension past a shaped body comprising a mixture of water soluble multivalent metal coagulant and water soluble polymeric flocculant, and in which the flocculant is in the form of discrete particles and the flowing stream erodes the body by dissolving the coagulant and thereby releasing the polymer particles from the body, and the particles are entrained in, and gradually dissolved into, the flowing stream.
Claim 11
Independent Claim
86 words
A method of treating an aqueous suspension with a multivalent metal coagulant and then with an organic polymeric flocculant comprising flowing the suspension past a shaped body comprising a mixture of water soluble multivalent metal coagulant and water soluble polymeric flocculant, and in which the flocculant is in the form of discrete particles and the flowing stream erodes the body by dissolving the coagulant and thereby releasing the polymer particles from the body, and the particles are entrained in, and gradually dissolved into, the flowing stream.
Claim 12
Dependent Claim
22 words
A method according to claim 9 in which the shaped body is a body according to any of claims 1 to 8.
References Cited (Backward Citations)
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