Patent US4496367A successfully refreshed from Google Patents.
US4496367A
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Pumpable aqueous slurry of a solid fuel and a process for the production thereof
Assignee: CARBOGEL JAPAN Inc
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Filing: 1983-05-06
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Granted: 1985-01-29
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Expires: 2003-05-06
Abstract
Abstract A pumpable aqueous slurry of a solid fuel in the form of a pulverized, carbonaceous material and a process for the production of such slurry are described. The aqueous slurry comprises a component which consists of coarse grains of carbonaceous material having a particle size of up to 25 mm, and a further component which consists of a carrier liquid in which the coarse-grained carbonaceous material is suspended. The carrier liquid proper has a solids content of 65-90% by weight and consists of water and pulverized, carbonaceous material having a particle size of at most 0.5 mm, preferably at most 350 μm, and 0.02-2% by weight of at least one additive including a water-soluble surface active compound which consists of an alkylene oxide adduct having a hydrophobic part and a hydrophilic part, said hydrophilic part consisting of a polyalkylene oxide chain, preferably a polyethylene oxide chain, having a length of 40-200 alkylene oxide units. The pumpable aqueous slurry is produced by first preparing the carrier liquid and then adding to said liquid 20-40% of the coarse-grained, carbonaceous material, based upon the total weight of the aqueous slurry. The aqueous slurry is intended primarily for pumping in pipelines.
Inventors
- 👤 Mait M. Mathiesen
- 👤 Lars I. Gillberg
- 👤 Karl M. E. Hellsten
- 👤 Gunvor B. T. Karlsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:19
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/32; C10L1/326; Y; Y10; Y10S; Y10S516/00; Y10S516/01
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
146 words
A pumpable aqueous slurry of a solid fuel in the form of a pulverized, carbonaceous material, characterized in that the aqueous slurry consists essentially of up to about forty percent by weight, based upon the total weight of the aqueous slurry, of coarse grains of the carbonaceous material having a particle size of at least about 1 mm up to 25 mm, said grains being suspended in a carrier liquid having a solids content of 65-90% by weight and consisting essentially of water, pulverized carbonaceous material with a particle size of at most about 0.5 mm, and 0.02-2% by weight of at least one additive which incorporates a water-soluble, surface active compound which is an alkylene oxide adduct having a hydrophobic part and a hydrophilic part, said hydrophilic part consisting essentially of at least one polyalkylene oxide chain having a length of 40-200 alkylene oxide units.
Claim 2
Dependent Claim
146 words
A pumpable aqueous slurry of a solid fuel in the form of a pulverized, carbonaceous material, characterized in that the aqueous slurry consists essentially of up to about forty percent by weight, based upon the total weight of the aqueous slurry, of coarse grains of the carbonaceous material having a particle size of at least about 1 mm up to 25 mm, said grains being suspended in a carrier liquid having a solids content of 65-90% by weight and consisting essentially of water, pulverized carbonaceous material with a particle size of at most about 0.5 mm, and 0.02-2% by weight of at least one additive which incorporates a water-soluble, surface active compound which is an alkylene oxide adduct having a hydrophobic part and a hydrophilic part, said hydrophilic part consisting essentially of at least one polyalkylene oxide chain having a length of 40-200 alkylene oxide units.
Claim 3
Dependent Claim
29 words
A pumpable aqueous slurry as claimed in claim 1, characterized in that it contains 20-40% of the coarse-grained carbonaceous material, based upon the total weight of the aqueous slurry.
Claim 4
Dependent Claim
35 words
A pumpable aqueous slurry as claimed in claim 1, characterized in that said alkylene oxide adduct is nonionic and that the surface active additive of the carrier liquid further includes an ionic surface active agent.
Claim 5
Dependent Claim
25 words
A pumpable aqueous slurry as claimed in claim one, characterized in that the carrier liquid contains 0.05-0.8% by weight of a water-soluble surface active compound.
Claim 6
Dependent Claim
39 words
A pumpable aqueous slurry as claimed in claim one, characterized in that the carrier liquid contains, in addition to the water-soluble surface active compound, a further additive which is selected from stabilizers, antifoaming agents, pH-modifying additives, and antimicrobial agents.
Claim 7
Dependent Claim
133 words
A process for the production of a pumpable aqueous slurry of a solid fuel in the form of a pulverized, carbonaceous material, characterized by preparing a carrier liquid having a solids content of 65-90% by weight and consisting essentially of water, pulverized carbonaceous material with a particle size of at most about 0.5 mm, and 0.02-2% by weight of at least one additive which incorporates a water-soluble, surface active compound which is an alkylene oxide adduct having a hydrophobic part and a hydrophilic part, said hydrophilic part consisting essentially of at least one polyalkylene oxide chain having a length of at least 40 units, and adding to the carrier liquid thus prepared coarse grains of the carbonaceous material having a particle size of at least about 1 mm up to about 25 mm.
Claim 8
Dependent Claim
133 words
A process for the production of a pumpable aqueous slurry of a solid fuel in the form of a pulverized, carbonaceous material, characterized by preparing a carrier liquid having a solids content of 65-90% by weight and consisting essentially of water, pulverized carbonaceous material with a particle size of at most about 0.5 mm, and 0.02-2% by weight of at least one additive which incorporates a water-soluble, surface active compound which is an alkylene oxide adduct having a hydrophobic part and a hydrophilic part, said hydrophilic part consisting essentially of at least one polyalkylene oxide chain having a length of at least 40 units, and adding to the carrier liquid thus prepared coarse grains of the carbonaceous material having a particle size of at least about 1 mm up to about 25 mm.
Claim 9
Dependent Claim
103 words
A process as claimed in claim 6, characterized in that the carrier liquid is prepared by a process incorporating the following steps: (a) wet-milling a carbonaceous starting material together with water at a solids content of 20-50% by weight in at least one milling step; (b) separating, if necessary, inorganic material of the carbonaceous starting material from the carbonaceous material of said starting material; (c) dewatering the carbonaceous material to a solids content which is substantially equal to the solids content of the final carrier liquid; (d) adding the additive of the carrier liquid and distributing said additive in the dewatered carbonaceous material.
Claim 10
Dependent Claim
31 words
A process as claimed in claim 6 or 7, characterized by adding to the carrier liquid 20-40%, based upon the total weight of the aqueous slurry, of the coarse-grained, carbonaceous material.
Claim 11
Dependent Claim
14 words
A process of claim 8 wherein the number of alkylene oxide units is 50-200.
References Cited (Backward Citations)
US2346151A
Cited
US2359325A
Cited
US3012826A
Cited
US3168350A
Cited
FR1308112A
Cited
US3254682A
Cited
DE1644942A1
Cited
US3762887A
Cited
US4162045A
Cited
US4162044A
Cited
US4094810A
Cited
US4076505A
Cited
US4217109A
Cited
US4242098A
Cited
US4282006A
Cited
US4302212A
Cited
US4358293A
Cited
WO1983000500A1
Cited
EP0077909A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-29 | 1988-07-30 | 1989-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-29 | 1992-07-30 | 1993-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-29 | 1996-07-30 | 1997-01-29 | $7700.00 | Window Closed / Lapsed |