US4370429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispersing solid carbonaceous material in water
Assignee: Ciba Specialty Chemicals Water Treatments Ltd
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Filing: 1981-05-27
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Granted: 1983-01-25
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Expires: 2001-05-27
Abstract
Abstract Quaternized ammonium synthetic polymers having a solution viscosity, as measured on a 1% solution in deionized water at 25 DEG 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 B. Clarke
- 👤 Leslie Pitts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:15
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
73 words
An aqueous slurry comprising solid particulate carbonaceous material, water and a stabilising amount of a dispersing agent, characterised in that the carbonaceous material is coke or coal and 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
73 words
An aqueous slurry comprising solid particulate carbonaceous material, water and a stabilising amount of a dispersing agent, characterised in that the carbonaceous material is coke or coal and 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
30 words
A slurry according to claim 1 characterised in that the polymer has a molecular weight of from 10 6 to 10 7 , preferably 2×10 6 to 5×10 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
60 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
91 words
In an aqueous slurry comprising solid particulate coke or coal, 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
91 words
In an aqueous slurry comprising solid particulate coke or coal, 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)
US4045380A
Cited
US4000095A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-24 | 1986-07-26 | 1987-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-24 | 1990-07-26 | 1991-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-24 | 1994-07-26 | 1995-01-25 | $7700.00 | Window Closed / Lapsed |