EP0041337A2
Expired / Lapsed
EP
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Dispersion of solid carbonaceous material in water
Assignee: Ciba Specialty Chemicals Water Treatments Ltd
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Filing: 1981-05-19
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Granted: —
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Expires: 2001-05-19
Abstract
Abstract Quaternised ammonium synthetic polymers having a solution viscosity, as measured on a 1 %solution in deionised water at 25°C using a suspended level viscometer, of from 1 to 500 cs are used as dispersing agents in aqueous slurries of water and solid particulate carbonaceous material.
Inventors
- 👤 John Bernard Clarke
- 👤 Leslie Pitts
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 05:51
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/32; C10L1/326; C09; C09K; C09K23/00; C09K23/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
64 words
An aqueous slurry comprising solid particulate carbonaceous material, water and a stabilising amount of a dispersing agent, characterised in that the dispersing agent comprises a quaternary ammonium synthetic polymer made by polymerisation of ethylenically unsaturated monomer or monomers and having a solution viscosity, as measured using a suspended level viscometer on a 1% solution in deionised water at 25°C, of 1 to 500 cs.
Claim 2
Dependent Claim
64 words
An aqueous slurry comprising solid particulate carbonaceous material, water and a stabilising amount of a dispersing agent, characterised in that the dispersing agent comprises a quaternary ammonium synthetic polymer made by polymerisation of ethylenically unsaturated monomer or monomers and having a solution viscosity, as measured using a suspended level viscometer on a 1% solution in deionised water at 25°C, of 1 to 500 cs.
Claim 3
Dependent Claim
24 words
A slurry according to claim 1 characterised in that the said solution viscosity is from 5 to 100 cs preferably 5 to 50 cs.
Claim 4
Dependent Claim
23 words
A slurry according to claim 1 characterised in that the polymer has a molecular weight of from 10 5 to 10 7 .
Claim 5
Dependent Claim
31 words
A slurry according to claim 1 characterised in that the polymer has a molecular weight of from 10 to 10 , preferably 2 x 10 to 5 x 10 6 .
Claim 6
Dependent Claim
27 words
A slurry according to claim 1 characterised in that at least 80% molar of the units of the polymer are quaternised acrylate, methacrylate, acrylamide or methacrylamide units.
Claim 7
Dependent Claim
61 words
A slurry according to claim 1 characterised in that at least 80% molar of the units of the polymer are quaternised dialkylaminoalkyl acrylate., methacrylate , acrylamide or methacrylamide wherein the alkyl groups in the dialkyl moiety are each selected from C 1-3 unsubstituted alkyl groups and the other alkyl group is selected from C 1-3 unsubstituted or hydroxy substituted alkyl groups.
Claim 8
Dependent Claim
29 words
A slurry according to claim 1 characterised in that the amount of polymer is from 0.2 to 1% dry weight based on the dry weight of particulate carbonaceous material.
Claim 9
Dependent Claim
28 words
A slurry according to claim 1 characterised in that the dry weight of particulate carbonaceous material in the slurry is at least 60% by weight of the slurry.
Claim 10
Dependent Claim
89 words
In an aqueous slurry comprising solid particulate carbonaceous material, water and a stabilising amount of a dispersing agent, the improvement comprising using as dispersing agent a quaternary ammonium synthetic polymer of which 80% molar of the recurring units are selected from quaternised dialkylaminoalkyl acrylate, methacrylate, acrylamide and methacrylamide units and which has a molecular weight of from 500,000 to 10 7 and which has a solution viscosity as measured on a 1% solution in deionised water at 25°C using a suspended level viscometer of from 5 to 100 cs.
Claim 11
Dependent Claim
89 words
In an aqueous slurry comprising solid particulate carbonaceous material, water and a stabilising amount of a dispersing agent, the improvement comprising using as dispersing agent a quaternary ammonium synthetic polymer of which 80% molar of the recurring units are selected from quaternised dialkylaminoalkyl acrylate, methacrylate, acrylamide and methacrylamide units and which has a molecular weight of from 500,000 to 10 7 and which has a solution viscosity as measured on a 1% solution in deionised water at 25°C using a suspended level viscometer of from 5 to 100 cs.
References Cited (Backward Citations)
No citation records indexed.
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