Patent US4251229A successfully refreshed from Google Patents.
US4251229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized fuel slurry
Assignee: DKS Co Ltd
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Filing: 1978-09-28
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Granted: 1981-02-17
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Expires: 1998-09-28
Abstract
Abstract A fuel slurry comprising a mixture of a fuel oil and pulverized coal may be effectively stabilized with a small amount of adducts of alkylene oxide and an alcohol, an amine, a carboxylic acid or a phenol, or inorganic acid esters of said adducts; or cross-linked products of said adducts or said inorganic acid esters.
Inventors
- 👤 Akihiro Naka
- 👤 Shuichi Honjo
- 👤 Kaoru Aoike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:28
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/32; C10L1/324; C10L1/322; C10L2250/00; C10L2250/06; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/02; Y10S516/06; Y10S516/07
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
157 words
A fuel slurry composition comprising a fuel oil, 10 to 60 weight % of pulverized coal having an average particle size of less than 200 microns, less than 50 weight % of water and an effective amount of a stabilizing agent selected from the group consisting of: (a) a polyether-type adduct havng a molecular weight from 1,000 to 100,000 between a lower alkylene oxide and a compound having at least three active hydrogen atoms selected from the group consisting of an alcohol, an amine, a carboxylic acid and a phenol, (b) an inorganic acid ester of said polyether-type adduct, and (c) a cross-linked product of said polyether-type adduct or said inorganic acid ester with a cross-linking agent selected from the group consisting of a polyisocyanate, a polyepoxy compound, a polyaldehyde, a polycarboxylic acid and a functional derivative of said polycarboxylic acid, said effective amount of said stabilizing agent minimizing sedimentation of said pulverized coal from said composition.
Claim 2
Dependent Claim
157 words
A fuel slurry composition comprising a fuel oil, 10 to 60 weight % of pulverized coal having an average particle size of less than 200 microns, less than 50 weight % of water and an effective amount of a stabilizing agent selected from the group consisting of: (a) a polyether-type adduct havng a molecular weight from 1,000 to 100,000 between a lower alkylene oxide and a compound having at least three active hydrogen atoms selected from the group consisting of an alcohol, an amine, a carboxylic acid and a phenol, (b) an inorganic acid ester of said polyether-type adduct, and (c) a cross-linked product of said polyether-type adduct or said inorganic acid ester with a cross-linking agent selected from the group consisting of a polyisocyanate, a polyepoxy compound, a polyaldehyde, a polycarboxylic acid and a functional derivative of said polycarboxylic acid, said effective amount of said stabilizing agent minimizing sedimentation of said pulverized coal from said composition.
Claim 3
Dependent Claim
17 words
The composition of claim 1, wherein said fuel oil is petroleum/crude oil or a liquid fraction thereof.
Claim 4
Dependent Claim
16 words
The composition of claim 1, wherein said coal is anthracite, bituminous coal, subbituminous coal or lignite.
Claim 5
Dependent Claim
21 words
The composition of claim 1, wherein said pulverized coal is produced by dry process or wet process in said fuel oil.
Claim 6
Dependent Claim
13 words
The composition of claim 1 containing less than 7 weight % of water.
Claim 7
Dependent Claim
15 words
The composition of claim 1, wherein said compound has at least five active hydrogen atoms.
Claim 8
Dependent Claim
21 words
The composition of claim 1, wherein said alcohol is glycerin, butanetriol, hexanetriol, trimethylolpropane, triethanolamine, diglycerin, pentaerythritol, sorbitol, glucose, sucrose or polyvinylalcohol.
Claim 9
Dependent Claim
19 words
The composition of claim 1, wherein said amine is ammonia, tallow propylenediamine, ethylenediamine, tetramethylenediamine, cyclohexyldiamine, diethylenetriamine, trimethylenetetramine or tetramethylenepentamine.
Claim 10
Dependent Claim
31 words
The composition of claim 1, wherein said carboxylic acid is ethylenediaminetetraacetic acid, homopolymers and copolymers of acrylic acid, homopolymers or copolymers of methacrylic acid, or homopolymers and copolymers of maleic anhydride.
Claim 11
Dependent Claim
16 words
The composition of claim 1, wherein said phenol is phenol-formaldehyde condensate, alkylphenol-formaldehyde condensate or naphthol-formaldehyde condensate.
Claim 12
Dependent Claim
17 words
The composition of claim 1, wherein said alkylene oxide is ethylene oxide, propylene oxide or mixtures thereof.
Claim 13
Dependent Claim
17 words
The composition of claim 1, wherein said polyether-type adduct has a molecular weight from 7,000 to 100,000.
Claim 14
Dependent Claim
14 words
The composition of claim 1, wherein said inorganic acid ester is sulfate or phosphate.
Claim 15
Dependent Claim
13 words
The composition of claim 1, wherein said polyisocyanate is hexamethylenediisocyanate, tolylenediisocyanate or metaxylenediisocyanate.
Claim 16
Dependent Claim
15 words
The composition of claim 1, wherein said polyepoxy compound is diglycidylbisphenol A, diglycidylethyleneglycol or diglycidyl-tetraoxyethyleneglycol.
Claim 17
Dependent Claim
12 words
The composition of claim 1, wherein said polyaldehyde is glyoxal or thiodiacetaldehyde.
Claim 18
Dependent Claim
37 words
The composition of claim 1, wherein said polycarboxylic acid is oxalic acid, phthalic acid, maleic acid, adipic acid, dimer acid, butanetetracarboxylic acid, ethylenediamine-tetraacetic acid, homopolymers and copolymers of acrylic acid, or homopolymers and copolymers of methacrylic acid.
Claim 19
Dependent Claim
12 words
The composition of claim 1, wherein said functional derivative is acid halide.
References Cited (Backward Citations)
US3454646A
Cited
US3839413A
Cited
US3668129A
Cited
US3729420A
Cited
US4046521A
Cited
US4083698A
Cited
US4090853A
Cited
US4125382A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |